Technician tool v0.4

Imported from the Google Drive folder 004-technician_tool/v0.4.

docs/firmware-diagnostics-proposals.md

@@ -0,0 +1,90 @@
+# Firmware diagnostics improvement proposals
+
+> **Status: draft proposal, AI-generated (Claude) for review by the firmware team.**
+> Nothing here is implemented. The firmware source was only read for analysis;
+> no firmware was changed. Every item links to an observation from bench
+> testing box `A4:CB:8F:C9:46:F8` (firmware v1.0, build `45fa9d5b9`) or from the
+> sample logs, so the value of each change can be judged.
+
+## Why
+
+Troubleshooting currently depends on reverse-engineering free-text log lines and
+on a status LED whose states overlap. Observed problems:
+
+| # | Observation | Effect for technicians |
+|---|---|---|
+| O1 | A new, uncommissioned box shows **green** for about 60 s, then purple | Looks healthy during installation |
+| O2 | Three different states share **white** (SD error, factory reset, setup portal) | Needs serial or guesswork |
+| O3 | **Blue** means "RTC did not answer", but the RTC is just the first I2C device | A loose I2C cable is misreported as an RTC fault |
+| O4 | Every build reports `App version: 1.0` | Builds are told apart only by ELF SHA |
+| O5 | Restarts after 150 s in an error state happen **without any log line** | A self-restart looks like a crash |
+| O6 | With the RTC not running and no Internet, sensor tasks **loop forever** on `RTC is uninitialized` | An offline box records nothing, and it isn't obvious why |
+| O7 | The OTA token is printed in plain text (`OTA token loaded from NVS: %s`, `received token: %s`) | Secrets end up in technician logs |
+| O8 | Native USB loses output while no host is reading; a stale FIFO fragment is glued to the next line | The early boot after a power cycle is lost, and lines get corrupted |
+| O9 | The microphone reports "shutdown state" (GPIO3) with no hint of the cause | A technician can't tell a switch from a fault |
+| O10 | The deployed build logs some messages under different tags than the source (e.g. SD mount under `INFLUX_BUFFER`) | Parsers must ignore tags |
+
+## Serial output
+
+Priority: **P1** = large gain for little effort, **P2** = valuable, **P3** = nice to have.
+
+### P1
+
+1. **One structured boot line** with a fixed prefix, printed right after `app_init`:
+   ```
+   KOTA: boot fw=1.0.15 build=45fa9d5b hw=2 mac=A4CB8FC946F8 reset=USB_UART_CHIP_RESET mode=matter commissioned=0 last_restart=status_watchdog
+   ```
+   The tool can then identify firmware, hardware and mode from a single line (fixes O4 and O10). Fill `PROJECT_VER` from `FIRMWARE_VERSION` (currently `15` in `pinout.hpp`) so every build has a unique version.
+2. **Log every status change** inside `Status::set_status()`, with a reason argument:
+   ```
+   KOTA: status OK -> CONNECTION_ERROR reason=influx_flush_failed
+   ```
+   This is the exact LED colour. Today the tool has to infer it from about 15 different messages.
+3. **Log the reason before every `esp_restart()`** and store it (RTC memory or NVS) so it can be printed at the next boot as `last_restart=`. Values: `status_watchdog_150s`, `out_of_resources_30s`, `button_factory_reset`, `setup_portal_toggle`, `ota_done`, `init_failed:<step>` (fixes O5).
+4. **Stop printing secrets**: print only the first and last 4 characters of the OTA token, or `token=present` (fixes O7).
+5. **Warn once and continue when the time is unset**, instead of the `while (now == 946684800)` loops in `device_status.cpp` and the sensors. Record data with a `time_valid=false` field or buffer it with uptime, then correct it after SNTP (fixes O6). This is a behaviour change, but the biggest data-loss risk found.
+
+### P2
+
+6. **I2C bus scan at boot**, before any sensor init:
+   ```
+   KOTA: i2c SDA=1 SCL=1 0x39=AS7341 0x68=DS1307 0x6B=SEN66(missing) 0x76=BME688
+   ```
+   Reading the SDA/SCL levels first detects a stuck-low bus (shorted or broken cable). The scan then separates "whole cable" from "one sensor" (fixes O3).
+7. **RTC detail**: at init, print the DS1307 clock-halt (CH) bit and the raw time (`KOTA: rtc running=0 time=2000-01-01 (coin cell?)`). After SNTP sets the time, re-read it 2 s later to verify it's ticking.
+8. **SD card detail**: card type, size, FAT type, free space, which `ENV.TXT` keys are present (names only, never values) and the buffer size in lines. Example: `KOTA: sd type=SDHC size=7.4GB fs=FAT32 free=7.3GB env_keys=INFLUX_URL,INFLUX_TOKEN buffer_lines=42`.
+9. **Periodic health line** every 60 s. `DeviceStatus` already computes almost everything:
+   ```
+   KOTA: health up=312s status=CONNECTION_ERROR wifi=disconnected rssi=0 time_valid=0 sd=ok buffer=42 heap=81234 psram=6.1M last_upload=never ota=unregistered
+   ```
+10. **Matter commissioning status at boot**: `KOTA: matter fabrics=0 window=open` plus the QR payload and manual code, so the tool can show the QR code on screen when the sticker is missing.
+11. **Microphone enable reason**: `KOTA: mic enabled=0 (GPIO3=1, expected 0)` once at boot, instead of a warning every 10 s (fixes O9).
+12. **Stable error IDs** in messages, e.g. `[E-SD-01] Failed to initialize the card`, documented in one table shared by the firmware, the technician tool and the service docs.
+
+### P3
+
+13. **Console commands** over USB (the firmware already runs a `console` task): `diag` (full health dump), `i2cscan`, `sdinfo`, `ledtest` (cycles all colours so the technician can confirm the LED hardware), `version`, `bootlog`. The tool could then run checks without a reboot.
+14. **Boot-log ring buffer** in RAM, dumped with `bootlog` or on first host connect. This recovers the early boot lost on native USB after a power-switch cycle (fixes O8).
+15. **Button events**: log the press start and release with duration (`KOTA: button press 1.2s -> setup_portal`). This allows a safe button test and shows accidental factory resets.
+
+## RGB LED
+
+1. **Separate "not connected yet" from "OK"** (fixes O1): **cyan breathing** while the box is uncommissioned / advertising over BLE, fast cyan while a phone is connected, and a green flash when commissioning completes.
+2. **Split the white states** with patterns (fixes O2):
+   - SD card / `ENV.TXT` error: white, fast blink (2 Hz)
+   - factory reset in progress: white, solid
+   - Wi-Fi setup portal: white, slow breathing
+3. **Blink codes for red and blue** (fixes O3): N short pulses followed by a pause identify the part.
+   - Red: 1 = BME688, 2 = SEN66, 3 = AS7341, 4 = microphone, 5 = flicker, 6 = self-check failed
+   - Blue: 1 = RTC not responding, 2 = I2C bus stuck low
+4. **Split purple**: solid = no network/DNS; blinking = Internet works but the server rejected the box (InfluxDB 401/404, OTA 401). These need different fixes (network vs SD card settings).
+5. **Show the cause before a self-restart**: flash the error colour 3 times before `esp_restart()`. After boot, show the previous boot's error colour for 3 s (from RTC memory), so a reboot loop has a visible cause.
+6. **Update progress**: yellow blinking while downloading (faster as progress grows); orange stays solid for the self-check.
+7. **Brightness and distinguishability**: colours are set at 10 % (`255/10`). Yellow and orange, and white and cyan, are hard to tell apart in daylight. Prefer fewer colours plus patterns, and raise brightness for error states.
+8. **Heartbeat LED (GPIO6)**: keep 1 Hz for "running", add a double-blink when offline, so the heartbeat alone gives a rough state even when the RGB LED is faulty.
+
+## What changes in the technician tool
+
+- The structured `KOTA:` lines (items 1, 2, 3, 9) would replace most regex rules in `rules.toml` and make the LED model exact rather than inferred.
+- The console commands (item 13) would let guided checks test hardware directly (I2C scan, LED test) instead of asking the technician to power-cycle.
+- The new LED patterns would add answers to the Quick check (e.g. "white, blinking fast") and remove the follow-up questions currently needed to separate the white states.

environment.yml

@@ -7,4 +7,5 @@ dependencies:
   - python=3.12
   - pyserial>=3.5
   - pyside6>=6.7
+  - esptool>=4.8,<5
   - pytest>=8

firmware/firmware.toml

@@ -0,0 +1,11 @@
+# Official firmware images the technician tool may flash.
+# Boxes normally receive new firmware over OTA; this is the factory image a
+# box updates itself from once it is online. Add a new image only when the
+# firmware team releases one: copy the .bin here and add an entry with its
+# SHA-256 (the tool refuses files that do not match).
+
+[[image]]
+file = "new_system.bin"
+sha256 = "1d58a8f4bb60f66009bd6df32e6e860c545c0c668de955af60d049ee3b9a212d"
+name = "v1.0 factory image (built Jun 29 2026)"
+notes = "Official factory image. Once online, the box registers for OTA and updates itself."

kota_tech/__init__.py

@@ -1,3 +1,3 @@
 """KOTA sensorbox technician tool."""
 
-__version__ = "0.2.0"
+__version__ = "0.4.0"

kota_tech/diag/engine.py

@@ -59,6 +59,7 @@ MILESTONES = [
     ("sd_mounted", "SD card mounted", False),
     ("env_loaded", "ENV.TXT read (InfluxDB settings)", False),
     ("matter_started", "Matter started", True),
+    ("matter_commissioned", "Paired in Matter", True),
     ("local_wifi_mode", "Local Wi-Fi mode (SSID from SD card)", True),
     ("sensors_ready", "All sensors started", False),
     ("wifi_connected", "Connected to Wi-Fi", False),
@@ -215,6 +216,7 @@ class Report:
     boots: list[BootRecord]
     lines: int
     mid_run: bool                         # no boot seen yet
+    technician: list[str] = field(default_factory=list)   # guided-check answers
 
     def to_text(self) -> str:
         out = [f"VERDICT: {self.verdict}",
@@ -243,6 +245,10 @@ class Report:
             out.append("Resolved during this session:")
             for f in self.resolved:
                 out.append(f"  - {f.title}" + (f" (by: {f.resolved_by})" if f.resolved_by else ""))
+        if self.technician:
+            out.append("")
+            out.append("Technician checks:")
+            out += [f"  - {t}" for t in self.technician]
         return "\n".join(out)
 
 
@@ -271,6 +277,7 @@ class DiagnosticsEngine:
         self.lines = 0
         self._tool_reset_at: float | None = None
         self._panic_tail = 0     # RAW lines after a panic line to keep
+        self.technician: list[str] = []
 
     @property
     def boot(self) -> BootRecord:
@@ -369,7 +376,22 @@ class DiagnosticsEngine:
         # Reached milestones in the order they happened, then the pending ones.
         ms.sort(key=lambda m: (m[2] is None, m[2] or 0))
         return Report(verdict, vsev, self.led, self.led_reason, self.firmware, ms, roots,
-                      earlier, resolved, list(self.boots), self.lines, mid_run)
+                      earlier, resolved, list(self.boots), self.lines, mid_run, list(self.technician))
+
+    def add_confirmed(self, key: str, severity: Severity, title: str, meaning: str,
+                      actions: tuple[str, ...]) -> Finding:
+        """A finding established by a guided check (technician answer + log)."""
+        f = self.findings.get(key)
+        if f is None:
+            f = self.findings[key] = Finding(key, key, severity, title, meaning, tuple(actions))
+        f.count += 1
+        f.boot = self.boot.index
+        f.resolved = False
+        f.evidence.append("confirmed by the technician during a guided check")
+        return f
+
+    def note_technician(self, text: str) -> None:
+        self.technician.append(text)
 
     # ------------------------------------------------------------ internals
     def _new_boot(self, host_time: float, explicit: bool) -> None:

kota_tech/diag/guides.py

@@ -0,0 +1,400 @@
+"""Guided troubleshooting: executes the decision trees in guides.toml.
+
+GUI-independent. The runner is fed the same LogLines as the diagnostics
+engine, reads the engine's report to route and to skip questions the log
+already answers, asks the host to perform tool actions (board reset), and
+records every answer and conclusion in the engine so they appear in the
+report and the session log.
+"""
+
+from __future__ import annotations
+
+import re
+import time
+import tomllib
+from collections.abc import Callable
+from dataclasses import dataclass, field
+from pathlib import Path
+
+from ..core.logline import LogLine
+from .engine import LED, DiagnosticsEngine, Severity
+
+GUIDES_PATH = Path(__file__).with_name("guides.toml")
+# LED answers a technician can give (engine colours + a reboot-loop pattern).
+LED_ANSWERS = ["GREEN", "PURPLE", "RED", "BLUE", "WHITE", "YELLOW", "ORANGE", "OFF", "CYCLING"]
+LED_ANSWER_LABELS = {**{k: v[0] for k, v in LED.items()},
+                     "CYCLING": "Keeps changing / goes dark every few seconds"}
+STEP_TYPES = {"led", "question", "info", "wait", "route"}
+END_SEVERITY = {"ok": None, "info": Severity.INFO, "warning": Severity.WARNING,
+                "error": Severity.ERROR, "critical": Severity.CRITICAL}
+
+
+@dataclass(frozen=True)
+class Option:
+    label: str
+    next: str
+
+
+@dataclass(frozen=True)
+class Step:
+    id: str
+    type: str
+    text: str = ""
+    options: tuple[Option, ...] = ()
+    route: dict[str, str] = field(default_factory=dict)      # led colour -> target
+    routes: dict[str, str] = field(default_factory=dict)     # rule id -> target
+    default: str | None = None
+    next: str | None = None
+    tool_action: str | None = None
+    until: re.Pattern[str] | None = None
+    until_milestone: str | None = None
+    fail_on: re.Pattern[str] | None = None
+    timeout_s: float = 60.0
+    pass_on_timeout: bool = False
+    on_ok: str | None = None
+    on_fail: str | None = None
+    on_timeout: str | None = None
+    skip_if_finding: str | None = None
+    skip_unless_feature: str | None = None
+    skip_to: str | None = None
+
+    def targets(self) -> list[str]:
+        t = [o.next for o in self.options] + list(self.route.values()) + list(self.routes.values())
+        t += [x for x in (self.default, self.next, self.on_ok, self.on_fail, self.on_timeout, self.skip_to) if x]
+        return t
+
+
+@dataclass(frozen=True)
+class End:
+    id: str
+    severity: str
+    title: str
+    text: str
+    actions: tuple[str, ...] = ()
+
+
+@dataclass(frozen=True)
+class Guide:
+    id: str
+    title: str
+    summary: str
+    recommend: tuple[str, ...]
+    start: str
+    steps: dict[str, Step]
+    ends: dict[str, End]
+
+
+def load_guides(path: Path = GUIDES_PATH) -> dict[str, Guide]:
+    data = tomllib.loads(path.read_text(encoding="utf-8"))
+    guides: dict[str, Guide] = {}
+    for g in data["guide"]:
+        steps = {}
+        for s in g.get("step", []):
+            steps[s["id"]] = Step(
+                id=s["id"], type=s["type"], text=s.get("text", ""),
+                options=tuple(Option(o["label"], o["next"]) for o in s.get("options", ())),
+                route=dict(s.get("route", {})), routes=dict(s.get("routes", {})),
+                default=s.get("default"), next=s.get("next"), tool_action=s.get("tool_action"),
+                until=re.compile(s["until"]) if "until" in s else None,
+                until_milestone=s.get("until_milestone"),
+                fail_on=re.compile(s["fail_on"]) if "fail_on" in s else None,
+                timeout_s=float(s.get("timeout_s", 60)), pass_on_timeout=bool(s.get("pass_on_timeout", False)),
+                on_ok=s.get("on_ok"), on_fail=s.get("on_fail"), on_timeout=s.get("on_timeout"),
+                skip_if_finding=s.get("skip_if_finding"), skip_unless_feature=s.get("skip_unless_feature"),
+                skip_to=s.get("skip_to"),
+            )
+        ends = {e["id"]: End(e["id"], e["severity"], e["title"], e["text"], tuple(e.get("actions", ())))
+                for e in g.get("end", [])}
+        guides[g["id"]] = Guide(g["id"], g["title"], g["summary"], tuple(g.get("recommend", ())),
+                                g["start"], steps, ends)
+    _validate(guides)
+    return guides
+
+
+def _validate(guides: dict[str, Guide]) -> None:
+    for g in guides.values():
+        if g.start not in g.steps:
+            raise ValueError(f"guide {g.id}: start step {g.start!r} missing")
+        for s in g.steps.values():
+            if s.type not in STEP_TYPES:
+                raise ValueError(f"{g.id}.{s.id}: unknown step type {s.type!r}")
+            if s.type == "led" and set(s.route) - set(LED_ANSWERS):
+                raise ValueError(f"{g.id}.{s.id}: unknown LED colours {set(s.route) - set(LED_ANSWERS)}")
+            if s.type == "wait" and not (s.until or s.until_milestone or s.pass_on_timeout):
+                raise ValueError(f"{g.id}.{s.id}: wait step needs until/until_milestone/pass_on_timeout")
+            if s.tool_action not in (None, "reset"):
+                raise ValueError(f"{g.id}.{s.id}: unknown tool_action {s.tool_action!r}")
+            for t in s.targets():
+                kind, _, ref = t.partition(":")
+                if kind == "end" and ref not in g.ends:
+                    raise ValueError(f"{g.id}.{s.id}: unknown end {ref!r}")
+                elif kind == "guide" and ref not in guides:
+                    raise ValueError(f"{g.id}.{s.id}: unknown guide {ref!r}")
+                elif not ref and t not in g.steps:
+                    raise ValueError(f"{g.id}.{s.id}: unknown step {t!r}")
+        for e in g.ends.values():
+            if e.severity not in END_SEVERITY:
+                raise ValueError(f"{g.id}.end.{e.id}: unknown severity {e.severity!r}")
+
+
+def recommended(guides: dict[str, Guide], engine: DiagnosticsEngine) -> list[Guide]:
+    """Guides matching the current root findings (in root order), then the LED."""
+    report = engine.report()
+    keys: list[str] = []
+    for rc in report.roots:
+        keys.append(rc.finding.rule_id)
+        keys += [c.rule_id for c in rc.consequences]
+    if report.led not in ("UNKNOWN",):
+        keys.append(f"led:{report.led}")
+    out: list[Guide] = [g for g in guides.values() if "always" in g.recommend]
+    for k in keys:
+        for g in guides.values():
+            if k in g.recommend and g not in out:
+                out.append(g)
+    return out
+
+
+@dataclass
+class View:
+    """What the UI should show right now."""
+    guide: Guide | None = None
+    step: Step | None = None
+    text: str = ""
+    options: list[tuple[str, str]] = field(default_factory=list)   # (key, label)
+    waiting: bool = False
+    remaining_s: float = 0.0
+    note: str = ""
+    end: End | None = None
+    can_back: bool = False
+
+
+class GuideRunner:
+    def __init__(self, engine: DiagnosticsEngine, guides: dict[str, Guide] | None = None,
+                 on_action: Callable[[str], bool] | None = None,
+                 on_log: Callable[[str], None] | None = None,
+                 clock: Callable[[], float] = time.monotonic):
+        self.engine = engine
+        self.guides = guides if guides is not None else load_guides()
+        self._on_action = on_action or (lambda _a: False)
+        self._on_log = on_log or (lambda _t: None)
+        self._clock = clock
+        self.cancel()
+
+    # ------------------------------------------------------------ control
+    def cancel(self) -> None:
+        self.guide: Guide | None = None
+        self.step: Step | None = None
+        self.end: End | None = None
+        self.note = ""
+        self._stack: list[tuple[str, str]] = []   # (guide id, step id) for Back
+        self._wait_started = 0.0
+        self._wait_boot = 0
+        self._wait_milestones: set[str] = set()
+
+    def start(self, guide_id: str) -> None:
+        self.cancel()
+        self._enter_guide(guide_id)
+
+    def answer(self, key: str) -> None:
+        """Pick an option: LED colour name for led steps, option index otherwise."""
+        s = self.step
+        if s is None:
+            return
+        if s.type == "led":
+            label = LED_ANSWER_LABELS.get(key, key)
+            self._record(s, label)
+            self._check_led(key)
+            target = s.route.get(key)
+        elif s.type == "question":
+            opt = s.options[int(key)]
+            self._record(s, opt.label)
+            target = opt.next
+        else:
+            return
+        if target:
+            self._push()
+            self._go(target)
+
+    def proceed(self) -> None:
+        """Continue on info steps; 'skip waiting' on wait steps."""
+        s = self.step
+        if s is None:
+            return
+        if s.type == "info" and s.next:
+            self._push()
+            self._go(s.next)
+        elif s.type == "wait":
+            self._record(s, "technician skipped the wait")
+            self._finish_wait("timeout")
+
+    def back(self) -> None:
+        # Never step back into a wait: re-entering it could restart the box.
+        while self._stack:
+            gid, sid = self._stack.pop()
+            if self.guides[gid].steps[sid].type != "wait":
+                self.guide, self.end, self.note = self.guides[gid], None, ""
+                self._enter_step(sid)
+                return
+
+    # --------------------------------------------------------------- feed
+    def feed(self, line: LogLine) -> None:
+        s = self.step
+        if s is None or s.type != "wait":
+            return
+        if s.fail_on and s.fail_on.search(line.text):
+            self._record(s, f"log: {line.text}")
+            self._finish_wait("fail")
+        elif s.until and s.until.search(line.text):
+            self._record(s, f"log: {line.text}")
+            self._finish_wait("ok")
+        elif s.until_milestone and self._milestone_new(s.until_milestone):
+            self._record(s, f"milestone reached: {s.until_milestone}")
+            self._finish_wait("ok")
+
+    def tick(self) -> None:
+        s = self.step
+        if s is not None and s.type == "wait" and self._clock() - self._wait_started >= s.timeout_s:
+            self._finish_wait("ok" if s.pass_on_timeout else "timeout")
+
+    # --------------------------------------------------------------- view
+    def view(self) -> View:
+        v = View(guide=self.guide, step=self.step, end=self.end, note=self.note, can_back=bool(self._stack))
+        s = self.step
+        if s is None:
+            return v
+        v.text = self._render(s.text)
+        if s.type == "led":
+            v.options = [(k, LED_ANSWER_LABELS[k]) for k in LED_ANSWERS if k in s.route]
+        elif s.type == "question":
+            v.options = [(str(i), o.label) for i, o in enumerate(s.options)]
+        elif s.type == "wait":
+            v.waiting = True
+            v.remaining_s = max(0.0, s.timeout_s - (self._clock() - self._wait_started))
+        return v
+
+    # ---------------------------------------------------------- internals
+    def _push(self) -> None:
+        if self.guide and self.step:
+            self._stack.append((self.guide.id, self.step.id))
+
+    def _enter_guide(self, guide_id: str) -> None:
+        self.guide = self.guides[guide_id]
+        self._on_log(f"technician: started guide '{self.guide.title}'")
+        self._enter_step(self.guide.start)
+
+    def _go(self, target: str) -> None:
+        kind, _, ref = target.partition(":")
+        if kind == "end" and ref:
+            self._conclude(self.guide.ends[ref])
+        elif kind == "guide" and ref:
+            self._enter_guide(ref)
+        else:
+            self._enter_step(target)
+
+    def _enter_step(self, step_id: str) -> None:
+        s = self.guide.steps[step_id]
+        self.step, self.note = s, ""
+        if s.skip_if_finding and self._finding_active(s.skip_if_finding):
+            self._auto(s, f"skipped - log already shows {s.skip_if_finding}", s.skip_to)
+            return
+        if s.skip_unless_feature and not self._feature(s.skip_unless_feature):
+            self._auto(s, f"skipped - firmware has no {s.skip_unless_feature}", s.skip_to)
+            return
+        if s.type == "route":
+            target = self._route(s)
+            self._auto(s, f"routed by log findings -> {target}", target)
+            return
+        if s.type == "wait":
+            self._wait_started = self._clock()
+            self._wait_boot = self.engine.boot.index
+            self._wait_milestones = set(self.engine.milestones)
+            if s.tool_action and not self._on_action(s.tool_action):
+                self.note = "Could not restart the box from the tool - connect to it first, or switch it off and on."
+            # A milestone that is already reached satisfies the wait at once
+            # unless the step first restarts the box.
+            if s.until_milestone and not s.tool_action and s.until_milestone in self.engine.milestones:
+                self._record(s, f"already reached: {s.until_milestone}")
+                self._finish_wait("ok")
+
+    def _auto(self, s: Step, why: str, target: str | None) -> None:
+        self._on_log(f"technician guide: {s.id}: {why}")
+        if target:
+            self._go(target)
+
+    def _finish_wait(self, outcome: str) -> None:
+        s = self.step
+        target = {"ok": s.on_ok, "fail": s.on_fail or s.on_timeout, "timeout": s.on_timeout or s.on_fail}[outcome]
+        if target is None:
+            return
+        self._push()
+        self._go(target)
+
+    def _milestone_new(self, mid: str) -> bool:
+        if mid not in self.engine.milestones:
+            return False
+        return self.engine.boot.index != self._wait_boot or mid not in self._wait_milestones
+
+    def _route(self, s: Step) -> str:
+        report = self.engine.report()
+        for rc in report.roots:
+            for f in (rc.finding, *rc.consequences):
+                if f.rule_id in s.routes:
+                    return s.routes[f.rule_id]
+        return s.default or "end:" + next(iter(self.guide.ends))
+
+    def _check_led(self, seen: str) -> None:
+        expected = self.engine.led
+        if expected in ("UNKNOWN", "OFF") or seen == "CYCLING" or seen == expected:
+            return
+        exp_label, see_label = LED[expected][0], LED_ANSWER_LABELS[seen]
+        self.engine.add_confirmed(
+            "tech.led_mismatch", Severity.WARNING,
+            f"LED shows {see_label}, but the log implies {exp_label}",
+            f"The firmware state in the log corresponds to {exp_label}, while the technician sees {see_label}. "
+            "Either the LED just changed (check again in a few seconds), the LED/its wiring is faulty, "
+            "or the box runs different firmware. Trust the log findings.",
+            ("Look at the LED again for 10 seconds.", "If it stays different: note it for repair (LED board)."))
+
+    def _conclude(self, end: End) -> None:
+        self.step, self.end = None, end
+        self._on_log(f"technician guide result: {end.title}")
+        sev = END_SEVERITY[end.severity]
+        self.engine.note_technician(f"{self.guide.title}: {end.title}")
+        if sev is not None:
+            self.engine.add_confirmed(f"tech.{self.guide.id}.{end.id}", sev, end.title, end.text, end.actions)
+
+    def _record(self, s: Step, answer: str) -> None:
+        q = self._render(s.text)
+        self.engine.note_technician(f"{q} -> {answer}")
+        self._on_log(f"technician: {q[:80]} -> {answer}")
+
+    def _finding_active(self, rule_id: str) -> bool:
+        return any(f.rule_id == rule_id and f.active for f in self.engine.findings.values())
+
+    def _feature(self, name: str) -> bool:
+        fw = self.engine.firmware
+        if name == "sd_wifi":
+            return fw.supports_sd_wifi is not False
+        if name == "setup_portal":
+            if fw.known is not None:
+                return fw.known.setup_portal
+            if "setup_portal" in fw.evidence:
+                return True
+            return "legacy_v1" not in fw.evidence   # unknown firmware: ask
+        return False
+
+    def _render(self, text: str) -> str:
+        report = self.engine.report()
+        sensors = sorted({f.title.removesuffix(" failed to start") for f in self.engine.findings.values()
+                          if f.rule_id == "sensor.init_failed" and f.active})
+        ctx = {
+            "expected_led": LED[report.led][0],
+            "failing_sensors": ", ".join(sensors) or "see the Diagnosis tab",
+            "top_finding": report.roots[0].finding.title if report.roots else "none",
+        }
+        return text.format_map(_Fmt(ctx))
+
+
+class _Fmt(dict):
+    def __missing__(self, key: str) -> str:
+        return "{" + key + "}"

kota_tech/diag/guides.toml

@@ -0,0 +1,734 @@
+# Guided troubleshooting: decision trees that combine technician answers
+# with live log evidence (diag.guides.GuideRunner executes them).
+#
+# Guide:  id, title, summary, recommend (rule ids / "led:<COLOUR>" / "always"),
+#         start (first step id), [[guide.step]], [[guide.end]]
+# Step types:
+#   led       technician picks the LED colour; `route` maps colour -> target.
+#             Colours: GREEN PURPLE RED BLUE YELLOW ORANGE WHITE OFF CYCLING
+#             The answer is compared with the colour the firmware log implies.
+#   question  `options` = [{label, next}]
+#   info      instruction + Continue (`next`)
+#   wait      optional `tool_action` ("reset"), then watch the log:
+#             `until` (regex) / `until_milestone`, `fail_on` (regex),
+#             `timeout_s`; go to on_ok / on_fail / on_timeout.
+#             `pass_on_timeout = true`: reaching the timeout without fail_on
+#             counts as ok (used for "watch for N seconds").
+#   route     automatic: first current root finding whose rule id is in
+#             `routes` decides; otherwise `default`.
+# Targets: "<step id>", "end:<end id>", "guide:<guide id>".
+# Optional on any step: skip_if_finding / skip_unless_feature (+ skip_to).
+# Text placeholders: {expected_led} {failing_sensors} {top_finding}
+# End severity: ok | info | warning | error | critical
+
+# ================================================================= quick
+[[guide]]
+id = "quick"
+title = "Quick check - start here"
+summary = "Tell the tool what the LED shows; it picks the right checks."
+recommend = ["always"]
+start = "led"
+
+[[guide.step]]
+id = "led"
+type = "led"
+text = "Look at the RGB status LED on the box (no need to open it). Which colour is it?"
+route = { GREEN = "heartbeat", PURPLE = "guide:network", RED = "guide:sensors", BLUE = "guide:rtc_i2c", WHITE = "guide:white", YELLOW = "guide:update", ORANGE = "guide:update", OFF = "guide:power", CYCLING = "guide:reboot_loop" }
+
+[[guide.step]]
+id = "heartbeat"
+type = "question"
+text = "Is the small LED next to the RGB LED blinking about once per second?"
+options = [
+  { label = "Yes, blinking", next = "green_route" },
+  { label = "No - steady on or off", next = "end:hung" },
+]
+
+[[guide.step]]
+id = "green_route"
+type = "route"
+routes = { "rtc.clock_not_running" = "guide:clock", "mic.silent" = "guide:mic", "mic.disabled" = "guide:mic", "matter.not_commissioned" = "guide:network", "net.dns_fail" = "guide:network" }
+default = "end:healthy"
+
+[[guide.end]]
+id = "healthy"
+severity = "ok"
+title = "Box looks healthy"
+text = "Green LED, firmware running and no problems in the log."
+actions = ["If the customer still reports missing data, keep the tool connected for 5 minutes and check that 'Data uploaded to InfluxDB' gets ticked."]
+
+[[guide.end]]
+id = "hung"
+severity = "error"
+title = "Firmware is not running normally"
+text = "The heartbeat LED should blink once per second whenever the firmware runs. A steady heartbeat LED means the firmware has frozen."
+actions = [
+  "Switch the box off and on with the power switch.",
+  "If it happens again: save the session log and re-flash the official firmware (Flash firmware tab, App only).",
+]
+
+# =============================================================== network
+[[guide]]
+id = "network"
+title = "Purple LED / no Internet"
+summary = "Pairing in Matter, site Wi-Fi and Internet checks, with live confirmation."
+recommend = ["led:PURPLE", "matter.not_commissioned", "net.dns_fail", "influx.buffer_fail", "ota.registration_failed"]
+start = "paired"
+
+[[guide.step]]
+id = "paired"
+type = "question"
+skip_if_finding = "matter.not_commissioned"
+skip_to = "pair_intro"
+text = "Was this box already added to the customer's Matter app (Apple Home, Google Home, ...) at this site?"
+options = [
+  { label = "Yes, it was paired before", next = "internet" },
+  { label = "No / not sure", next = "pair_intro" },
+]
+
+[[guide.step]]
+id = "internet"
+type = "question"
+text = "Does the site Wi-Fi have working Internet? Check with a phone connected to the same Wi-Fi (open any website)."
+options = [
+  { label = "Yes, Internet works", next = "changed" },
+  { label = "No Internet on the site Wi-Fi", next = "end:site_offline" },
+]
+
+[[guide.step]]
+id = "changed"
+type = "question"
+text = "Was the Wi-Fi name or password changed, or the router replaced, since the box was installed?"
+options = [
+  { label = "Yes / possibly", next = "end:repair_needed" },
+  { label = "No", next = "end:offline_unknown" },
+]
+
+[[guide.step]]
+id = "pair_intro"
+type = "info"
+text = "The box is not on any Wi-Fi yet: it must be paired in Matter. You need: a phone with Bluetooth on, the customer's Matter app, the 2.4 GHz Wi-Fi password, and the QR sticker of this box. Keep the tool connected - it follows the pairing live."
+next = "pair_start"
+
+[[guide.step]]
+id = "pair_start"
+type = "wait"
+text = "In the Matter app choose 'Add device' and scan the QR code on the sticker (or type the 11-digit code printed under it). Keep the phone within 1 m of the box."
+until = 'MAIN: Commissioning session started'
+timeout_s = 300
+on_ok = "pair_wifi"
+on_timeout = "not_found"
+
+[[guide.step]]
+id = "not_found"
+type = "question"
+text = "The box has not seen the phone connect yet. What does the app show?"
+options = [
+  { label = "Still searching / let me try again", next = "pair_start" },
+  { label = "'Device not found' or similar", next = "end:ble_not_found" },
+]
+
+[[guide.step]]
+id = "pair_wifi"
+type = "wait"
+text = "The phone is connected to the box. Follow the app: choose the 2.4 GHz Wi-Fi network and enter its password."
+until = 'MAIN: Commissioning complete|MAIN: Fabric is committed'
+fail_on = 'Commissioning failed, fail safe timer expired'
+timeout_s = 300
+on_ok = "pair_time"
+on_fail = "end:pair_failed"
+on_timeout = "end:pair_failed"
+
+[[guide.step]]
+id = "pair_time"
+type = "wait"
+text = "Paired! The box is joining the Wi-Fi and getting the time from the Internet..."
+until_milestone = "time_synced"
+timeout_s = 120
+on_ok = "pair_upload"
+on_timeout = "end:joined_no_internet"
+
+[[guide.step]]
+id = "pair_upload"
+type = "wait"
+text = "Online. Waiting for the first measurements to reach the database (up to 4 minutes)..."
+until = 'INFLUX: HTTP request performed, status code: 2\d\d'
+fail_on = 'INFLUX: Failed to perform HTTP request: (401|403|404)'
+timeout_s = 240
+on_ok = "end:online"
+on_fail = "end:influx_rejected"
+on_timeout = "end:no_upload"
+
+[[guide.end]]
+id = "online"
+severity = "ok"
+title = "Box is paired and uploading data"
+text = "Pairing, Internet time and the first upload all worked."
+actions = [
+  "The box may now download a firmware update (yellow, then orange LED, a few minutes). Do not switch it off.",
+  "It should end green.",
+]
+
+[[guide.end]]
+id = "site_offline"
+severity = "warning"
+title = "Site network has no Internet"
+text = "The box cannot work until the site Wi-Fi reaches the Internet. This is not a box fault."
+actions = ["Ask the customer to fix the Internet connection, then power-cycle the box."]
+
+[[guide.end]]
+id = "repair_needed"
+severity = "warning"
+title = "Box must be paired again"
+text = "The box still remembers the old Wi-Fi. It needs a factory reset and new pairing."
+actions = [
+  "Hold the Matter button for 5 seconds (LED turns white) - this erases the old pairing.",
+  "Remove the box from the customer's Matter app, then run this guide again and choose 'No / not sure'.",
+]
+
+[[guide.end]]
+id = "offline_unknown"
+severity = "error"
+title = "Box is paired but cannot reach the Internet - cause unclear"
+text = "The network works for other devices, but not for this box."
+actions = [
+  "Check the router does not block new devices (guest isolation, MAC filter). Box MAC is shown in the port list.",
+  "Move the box closer to the router to rule out weak signal.",
+  "If nothing helps: factory reset (hold the Matter button 5 s) and pair again.",
+]
+
+[[guide.end]]
+id = "ble_not_found"
+severity = "error"
+title = "Phone cannot find the box over Bluetooth"
+text = "The box only accepts pairing for a limited time after start-up."
+actions = [
+  "Switch the box off and on to reopen the pairing window, then try again within 10 minutes.",
+  "Check Bluetooth and location permission are on for the Matter app.",
+  "If the box was paired to another app before: hold the Matter button 5 s (factory reset) first.",
+]
+
+[[guide.end]]
+id = "pair_failed"
+severity = "error"
+title = "Pairing did not finish"
+text = "The phone connected but the box did not join the Wi-Fi."
+actions = [
+  "Use a 2.4 GHz network (many routers have a separate 2.4 GHz name).",
+  "Re-enter the Wi-Fi password carefully.",
+  "Switch the box off and on, then pair again.",
+]
+
+[[guide.end]]
+id = "joined_no_internet"
+severity = "error"
+title = "Box joined the Wi-Fi but has no Internet"
+text = "Pairing worked, but the box cannot reach time or data servers."
+actions = [
+  "Check the network allows outgoing connections (HTTPS, NTP) for new devices.",
+  "Try a phone hotspot to rule out the site network.",
+]
+
+[[guide.end]]
+id = "influx_rejected"
+severity = "critical"
+title = "Database rejected the box (token / bucket)"
+text = "The box is online but InfluxDB refused the upload. The SD card settings are wrong."
+actions = ["Re-provision the SD card with the current ENV.TXT (SD card is inside the case)."]
+
+[[guide.end]]
+id = "no_upload"
+severity = "warning"
+title = "Online, but no upload seen yet"
+text = "Uploads happen every minute; the first one can be delayed while the air sensor warms up."
+actions = ["Keep the tool connected a few more minutes and watch the Diagnosis tab."]
+
+# ================================================================= RTC / I2C
+[[guide]]
+id = "rtc_i2c"
+title = "Blue LED - clock / I2C cable"
+summary = "Re-seat the I2C cable and verify the start-up live."
+recommend = ["led:BLUE", "rtc.init_failed", "i2c.errors"]
+start = "explain"
+
+[[guide.step]]
+id = "explain"
+type = "info"
+text = "Blue means the clock chip did not answer. It is the first chip on the shared I2C cable between the boards, so a loose cable is the most common cause. This check needs the case opened."
+next = "reseat"
+
+[[guide.step]]
+id = "reseat"
+type = "info"
+text = "Switch the power OFF. Open the case. Unplug and firmly re-plug the I2C cable between the boards at both ends. Close the case and switch the power ON. Then press Continue."
+next = "verify"
+
+[[guide.step]]
+id = "verify"
+type = "wait"
+text = "Watching the start-up (up to 60 s)..."
+until_milestone = "sensors_ready"
+fail_on = 'MAIN: Failed to initialize RTC'
+timeout_s = 60
+on_ok = "end:i2c_fixed"
+on_fail = "damaged"
+on_timeout = "damaged"
+
+[[guide.step]]
+id = "damaged"
+type = "question"
+text = "The clock still does not answer. Is the I2C cable or its connector visibly damaged (pinched, broken wire, bent pin)?"
+options = [
+  { label = "Yes, damaged", next = "end:replace_cable" },
+  { label = "No, looks fine", next = "end:rtc_module" },
+]
+
+[[guide.end]]
+id = "i2c_fixed"
+severity = "ok"
+title = "Fixed - all sensors start again"
+text = "After re-seating the cable the clock and all sensors started."
+actions = ["Make sure the cable is routed without strain before closing the case."]
+
+[[guide.end]]
+id = "replace_cable"
+severity = "error"
+title = "Replace the I2C cable"
+text = "A damaged I2C cable stops the clock and all sensors."
+actions = ["Replace the cable, then run this check again."]
+
+[[guide.end]]
+id = "rtc_module"
+severity = "error"
+title = "Clock (RTC) module is probably faulty"
+text = "The cable is fine but the clock chip does not answer."
+actions = ["Replace the RTC module, or send the box for repair with the session log."]
+
+# ==================================================================== white
+[[guide]]
+id = "white"
+title = "White LED - SD card / reset / setup mode"
+summary = "Tell apart the three white states and check the SD card."
+recommend = ["led:WHITE", "sd.card_fail", "sd.mount_fail", "sd.env_open_fail", "influx.env_missing", "influx.init_fail"]
+start = "button"
+
+[[guide.step]]
+id = "button"
+type = "question"
+text = "Did anyone hold the Matter button (outside the case) for about 5 seconds just before the LED turned white?"
+options = [
+  { label = "Yes", next = "end:factory_reset" },
+  { label = "No / don't know", next = "portal" },
+]
+
+[[guide.step]]
+id = "portal"
+type = "question"
+skip_unless_feature = "setup_portal"
+skip_to = "sd_reseat"
+text = "On a phone, look at the Wi-Fi list: is there a network called 'KotaSensorBox-....'?"
+options = [
+  { label = "Yes", next = "end:setup_mode" },
+  { label = "No", next = "sd_reseat" },
+]
+
+[[guide.step]]
+id = "sd_reseat"
+type = "info"
+text = "The SD card is probably not readable. This needs the case opened: switch the power OFF, open the case, push the SD card in until it clicks (or remove and re-insert it). Close the case, switch the power ON, then press Continue."
+next = "sd_verify"
+
+[[guide.step]]
+id = "sd_verify"
+type = "wait"
+text = "Watching the SD card start-up (up to 60 s)..."
+until = 'Read INFLUX_URL from \.env file'
+fail_on = 'Failed to initialize the card|Failed to mount filesystem|Failed to read INFLUX_(URL|TOKEN)|Failed to open \.env file'
+timeout_s = 60
+on_ok = "end:sd_fixed"
+on_fail = "end:sd_reprovision"
+on_timeout = "end:sd_reprovision"
+
+[[guide.end]]
+id = "factory_reset"
+severity = "info"
+title = "White = factory reset in progress"
+text = "The box erased its Matter pairing and restarts."
+actions = ["Pair it again in the Matter app (Purple LED guide)."]
+
+[[guide.end]]
+id = "setup_mode"
+severity = "info"
+title = "White = Wi-Fi setup mode"
+text = "The box is waiting for Wi-Fi settings on its own network."
+actions = [
+  "Connect a phone to KotaSensorBox-.... and open http://sensorbox.local/ to enter the Wi-Fi,",
+  "or short-press the Matter button (< 2 s) to leave setup mode.",
+]
+
+[[guide.end]]
+id = "sd_fixed"
+severity = "ok"
+title = "Fixed - SD card is read again"
+text = "The box found the SD card and read ENV.TXT."
+actions = ["Close the case and watch the Diagnosis tab for a minute."]
+
+[[guide.end]]
+id = "sd_reprovision"
+severity = "critical"
+title = "SD card is unreadable or has wrong settings"
+text = "Even after re-seating, the card or its ENV.TXT cannot be used."
+actions = [
+  "Re-provision the card with the tool (SD tab, coming in v0.5) or use a new card.",
+  "The Diagnosis tab shows which step failed (card, file system or ENV.TXT keys).",
+]
+
+# ================================================================== sensors
+[[guide]]
+id = "sensors"
+title = "Red LED - sensor or hardware fault"
+summary = "Find the failing sensor and verify after re-seating its cable."
+recommend = ["led:RED", "sensor.init_failed", "sensor.selfcheck_failed", "sys.out_of_resources", "ota.selfcheck_failed"]
+start = "which"
+
+[[guide.step]]
+id = "which"
+type = "route"
+routes = { "sensor.init_failed" = "reseat", "rtc.init_failed" = "guide:rtc_i2c", "ota.selfcheck_failed" = "end:selfcheck", "sensor.selfcheck_failed" = "end:selfcheck", "sys.out_of_resources" = "end:oom" }
+default = "capture"
+
+[[guide.step]]
+id = "capture"
+type = "wait"
+text = "The log does not show the cause yet. The tool restarts the box and records its start-up (45 s)..."
+tool_action = "reset"
+timeout_s = 45
+pass_on_timeout = true
+on_ok = "which_again"
+
+[[guide.step]]
+id = "which_again"
+type = "route"
+routes = { "sensor.init_failed" = "reseat", "rtc.init_failed" = "guide:rtc_i2c", "sys.out_of_resources" = "end:oom" }
+default = "end:red_unclear"
+
+[[guide.step]]
+id = "reseat"
+type = "info"
+text = "Failing: {failing_sensors}. This needs the case opened: switch the power OFF, open the case and re-seat the cable of that sensor. Close the case, switch the power ON, then press Continue."
+next = "verify"
+
+[[guide.step]]
+id = "verify"
+type = "wait"
+text = "Watching the sensor start-up (up to 60 s)..."
+until_milestone = "sensors_ready"
+fail_on = 'MAIN: Failed to initialize'
+timeout_s = 60
+on_ok = "end:sensor_fixed"
+on_fail = "end:sensor_replace"
+on_timeout = "end:sensor_replace"
+
+[[guide.end]]
+id = "sensor_fixed"
+severity = "ok"
+title = "Fixed - all sensors start again"
+text = "After re-seating, every sensor started."
+actions = ["Close the case and watch the Diagnosis tab for a minute."]
+
+[[guide.end]]
+id = "sensor_replace"
+severity = "error"
+title = "Sensor still fails - replace it"
+text = "The sensor does not start even with a re-seated cable."
+actions = ["Replace the named sensor (or its cable) and run this check again."]
+
+[[guide.end]]
+id = "selfcheck"
+severity = "error"
+title = "A firmware update was rejected by its self-check"
+text = "The box rolled back to its previous firmware because a sensor failed the test."
+actions = ["Check the sensor named in the Diagnosis tab (inside the case), then power-cycle."]
+
+[[guide.end]]
+id = "oom"
+severity = "error"
+title = "Firmware ran out of memory"
+text = "Not a hardware fault; the firmware restarts itself."
+actions = ["Power-cycle. If it repeats, send the session log to the firmware team."]
+
+[[guide.end]]
+id = "red_unclear"
+severity = "warning"
+title = "Red LED without a clear cause in the log"
+text = "The start-up did not show a failing sensor."
+actions = ["Save the session log and send it to the firmware team."]
+
+# ============================================================= reboot loop
+[[guide]]
+id = "reboot_loop"
+title = "LED keeps changing / box restarts"
+summary = "Record several start-ups and find the error just before each restart."
+recommend = ["led:CYCLING", "reboot.loop", "sys.crash", "reboot.unexpected", "reboot.brownout", "reboot.watchdog"]
+start = "record"
+
+[[guide.step]]
+id = "record"
+type = "wait"
+text = "The tool restarts the box and records 45 seconds of start-up..."
+tool_action = "reset"
+timeout_s = 45
+pass_on_timeout = true
+on_ok = "cause"
+
+[[guide.step]]
+id = "cause"
+type = "route"
+routes = { "rtc.init_failed" = "guide:rtc_i2c", "sd.card_fail" = "guide:white", "sd.mount_fail" = "guide:white", "sd.env_open_fail" = "guide:white", "influx.env_missing" = "guide:white", "influx.init_fail" = "guide:white", "sensor.init_failed" = "guide:sensors", "reboot.brownout" = "end:power_supply", "matter.not_commissioned" = "guide:network", "net.dns_fail" = "guide:network", "influx.buffer_fail" = "guide:network" }
+default = "end:loop_unclear"
+
+[[guide.end]]
+id = "power_supply"
+severity = "error"
+title = "Power supply is too weak or unstable"
+text = "The chip reset itself because the voltage dropped."
+actions = ["Check the power supply, cable and connectors; try another supply."]
+
+[[guide.end]]
+id = "loop_unclear"
+severity = "warning"
+title = "No clear restart cause in 45 s"
+text = "The box did not show a known start-up error during the recording."
+actions = ["Keep the tool connected for 5 minutes, then save the session log for the firmware team."]
+
+# ================================================================== update
+[[guide]]
+id = "update"
+title = "Yellow / orange LED - firmware update"
+summary = "Wait for the update and its self-check to finish."
+recommend = ["led:YELLOW", "led:ORANGE", "ota.updating", "ota.selfcheck"]
+start = "wait"
+
+[[guide.step]]
+id = "wait"
+type = "wait"
+text = "A firmware update or its self-check is running. Do NOT switch the box off. Waiting up to 10 minutes..."
+until = 'Passing selfcheck|OTA update successful'
+fail_on = 'OTA update failed|Failing selfcheck'
+timeout_s = 600
+on_ok = "end:update_ok"
+on_fail = "end:update_failed"
+on_timeout = "end:update_slow"
+
+[[guide.end]]
+id = "update_ok"
+severity = "ok"
+title = "Update finished"
+text = "The new firmware was installed or accepted."
+actions = ["Wait for the green LED."]
+
+[[guide.end]]
+id = "update_failed"
+severity = "error"
+title = "Update failed"
+text = "The box keeps its current firmware and retries later."
+actions = ["Check the Wi-Fi is stable. The Diagnosis tab shows why it failed."]
+
+[[guide.end]]
+id = "update_slow"
+severity = "warning"
+title = "Update is taking very long"
+text = "No end of the update was seen in 10 minutes."
+actions = ["Check the Wi-Fi signal; leave the box powered and check again later."]
+
+# =================================================================== power
+[[guide]]
+id = "power"
+title = "LED off"
+summary = "Power switch, heartbeat LED and USB connection."
+recommend = ["led:OFF"]
+start = "switch"
+
+[[guide.step]]
+id = "switch"
+type = "question"
+text = "Is the power switch on the outside of the case set to ON?"
+options = [
+  { label = "It was OFF - I switched it on", next = "boot" },
+  { label = "It is ON", next = "heartbeat" },
+]
+
+[[guide.step]]
+id = "boot"
+type = "wait"
+text = "Waiting for the box to start (up to 30 s)..."
+until_milestone = "app_started"
+timeout_s = 30
+on_ok = "end:was_off"
+on_timeout = "heartbeat"
+
+[[guide.step]]
+id = "heartbeat"
+type = "question"
+text = "Is the small LED next to the RGB LED blinking?"
+options = [
+  { label = "Yes, blinking", next = "end:rgb_led_fault" },
+  { label = "No", next = "end:no_power" },
+]
+
+[[guide.end]]
+id = "was_off"
+severity = "ok"
+title = "Box was switched off"
+text = "It starts normally after switching on."
+actions = ["Run the Quick check again once the LED shows a colour."]
+
+[[guide.end]]
+id = "rgb_led_fault"
+severity = "warning"
+title = "Firmware runs, but the RGB LED stays dark"
+text = "The heartbeat LED shows the firmware is running; the RGB LED or its wiring is faulty."
+actions = ["Use the Diagnosis tab instead of the LED; replace the LED board when convenient."]
+
+[[guide.end]]
+id = "no_power"
+severity = "error"
+title = "Box does not start"
+text = "Neither LED is lit: no power or the firmware does not start."
+actions = [
+  "Check the power supply and cable.",
+  "If the USB port shows up in this tool, re-flash the official firmware (Flash firmware tab, App only).",
+]
+
+# =================================================================== clock
+[[guide]]
+id = "clock"
+title = "Clock not set"
+summary = "Why readings are on hold and when the coin cell matters."
+recommend = ["rtc.clock_not_running", "rtc.lost_after_sync"]
+start = "internet"
+
+[[guide.step]]
+id = "internet"
+type = "question"
+text = "The box clock is not set, so readings are on hold. Will the box have Internet at its installation site?"
+options = [
+  { label = "Yes", next = "end:clock_auto" },
+  { label = "No / not yet", next = "end:clock_offline" },
+]
+
+[[guide.end]]
+id = "clock_auto"
+severity = "info"
+title = "Clock will be set automatically"
+text = "On its first Internet connection the box sets its clock and starts recording."
+actions = ["If the clock is lost again after every power-off, replace the RTC coin cell (inside the case)."]
+
+[[guide.end]]
+id = "clock_offline"
+severity = "error"
+title = "Box will not record data without Internet"
+text = "Without the Internet the clock cannot be set, and the firmware holds all readings until it is."
+actions = [
+  "Give the box Internet access (pair it in Matter).",
+  "Replace the RTC coin cell (inside the case) so the time survives power-offs.",
+]
+
+# ===================================================================== mic
+[[guide]]
+id = "mic"
+title = "Microphone check"
+summary = "Switched-off or silent microphone."
+recommend = ["mic.disabled", "mic.silent", "mic.read_fail"]
+start = "which"
+
+[[guide.step]]
+id = "which"
+type = "route"
+routes = { "mic.disabled" = "switch", "mic.silent" = "clap", "mic.read_fail" = "end:mic_faulty" }
+default = "clap"
+
+[[guide.step]]
+id = "switch"
+type = "question"
+text = "The box reads its microphone switch as OFF. The switch is on the back of the case, just above the power switch (no need to open the box). Should this box measure noise?"
+options = [
+  { label = "Yes - I flipped the microphone switch", next = "switch_verify" },
+  { label = "No - it is meant to be off", next = "end:mic_off_ok" },
+]
+
+[[guide.step]]
+id = "switch_verify"
+type = "wait"
+# The firmware re-reads the switch before every reading (~10 s): no restart needed.
+text = "Waiting for the next microphone reading (up to 30 s)..."
+until = 'MICROPHONE: Read \d+ bytes'
+fail_on = 'Microphone is in shutdown state'
+timeout_s = 30
+on_ok = "end:mic_on"
+on_fail = "flip_back"
+on_timeout = "flip_back"
+
+[[guide.step]]
+id = "flip_back"
+type = "question"
+text = "The box still reads the switch as OFF. Flip the microphone switch to the other position (it may have been ON already)."
+options = [
+  { label = "Done - I flipped it to the other position", next = "switch_verify2" },
+  { label = "Leave it off", next = "end:mic_off_ok" },
+]
+
+[[guide.step]]
+id = "switch_verify2"
+type = "wait"
+text = "Waiting for the next microphone reading (up to 30 s)..."
+until = 'MICROPHONE: Read \d+ bytes'
+fail_on = 'Microphone is in shutdown state'
+timeout_s = 30
+on_ok = "end:mic_on"
+on_fail = "end:mic_switch_faulty"
+on_timeout = "end:mic_switch_faulty"
+
+[[guide.step]]
+id = "clap"
+type = "wait"
+text = "Check the microphone switch (back of the case, above the power switch) is ON. Then clap your hands or speak loudly right next to the box for about 20 seconds..."
+until = 'dB peak: (?!-inf)'
+timeout_s = 45
+on_ok = "end:mic_ok"
+on_timeout = "end:mic_faulty"
+
+[[guide.end]]
+id = "mic_on"
+severity = "ok"
+title = "Microphone is on and recording"
+text = "The firmware reads audio samples again."
+actions = ["Leave the microphone switch in this position."]
+
+[[guide.end]]
+id = "mic_off_ok"
+severity = "info"
+title = "Microphone intentionally off"
+text = "No noise data is recorded for this box; everything else works."
+actions = []
+
+[[guide.end]]
+id = "mic_switch_faulty"
+severity = "warning"
+title = "Microphone switch has no effect"
+text = "The box reads the microphone as OFF in both switch positions (enable line GPIO3)."
+actions = ["Check the switch and its cable to the main board (inside the case); replace the switch if needed."]
+
+[[guide.end]]
+id = "mic_ok"
+severity = "ok"
+title = "Microphone works"
+text = "It picked up sound - the earlier silence was just a very quiet room."
+actions = []
+
+[[guide.end]]
+id = "mic_faulty"
+severity = "error"
+title = "Microphone records nothing"
+text = "Even loud noise next to the box gives no signal, although the switch is on."
+actions = ["Check the microphone board/cable (inside the case); replace the microphone if needed."]

kota_tech/diag/rules.toml

@@ -72,6 +72,13 @@ severity = "ignore"
 milestone = "wifi_connected"
 clears = ["matter.not_commissioned", "wifi.disconnected"]
 
+[[rule]]
+id = "matter.commissioned"
+pattern = 'MAIN: Commissioning complete|MAIN: Fabric is committed'
+severity = "ignore"
+milestone = "matter_commissioned"
+clears = ["matter.not_commissioned", "matter.commissioning_failed"]
+
 [[rule]]
 id = "net.time_synced"
 pattern = 'SNTP: Time synchronized'
@@ -551,8 +558,8 @@ id = "mic.disabled"
 pattern = 'MICROPHONE: Microphone is in shutdown state'
 severity = "info"
 title = "Microphone is switched off - no noise measurements"
-meaning = "The firmware reads the microphone enable line (GPIO3) as 'off', which it treats as disabled on purpose. Noise levels are not recorded."
+meaning = "The microphone switch on the back of the case (just above the power switch) is OFF, so noise levels are not recorded."
-actions = ["If this box should measure noise: check the microphone enable switch/jumper and its wiring (inside the case)."]
+actions = ["If this box should measure noise: flip the microphone switch (back of the case, above the power switch). No restart needed - it is picked up within about 10 s."]
 
 [[rule]]
 id = "gather.empty_reading"

kota_tech/flash/image.py

@@ -0,0 +1,152 @@
+"""Official firmware images: validation and layout.
+
+Only images listed in firmware/firmware.toml with a matching SHA-256 are
+offered for flashing: boxes normally get new firmware over OTA, so the tool
+only ever writes the official factory image.
+
+The factory image is a merged ESP32-S3 image (bootloader at 0x0, partition
+table at 0x8000, app at ota_0). App-only flashing takes the app out of it
+and writes it to ota_0; the layout comes from the image's own partition
+table, not from constants.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import struct
+import tomllib
+from dataclasses import dataclass
+from pathlib import Path
+
+FIRMWARE_DIR = Path(__file__).resolve().parents[2] / "firmware"
+MANIFEST = FIRMWARE_DIR / "firmware.toml"
+
+PT_OFFSET = 0x8000
+PT_SIZE = 0xC00
+ESP32S3_CHIP_ID = 9
+IMAGE_MAGIC = 0xE9
+APP_DESC_MAGIC = 0xABCD5432
+FLASH_SIZES = {0: "1MB", 1: "2MB", 2: "4MB", 3: "8MB", 4: "16MB", 5: "32MB"}
+
+
+class ImageError(ValueError):
+    pass
+
+
+@dataclass(frozen=True)
+class Partition:
+    label: str
+    type: int
+    subtype: int
+    offset: int
+    size: int
+
+
+@dataclass(frozen=True)
+class AppInfo:
+    project: str
+    version: str
+    built: str
+    idf: str
+    elf_sha: str       # hex
+
+
+@dataclass(frozen=True)
+class FirmwareImage:
+    path: Path
+    name: str
+    notes: str
+    sha256: str
+    flash_size: str
+    partitions: tuple[Partition, ...]
+    app: AppInfo
+
+    @property
+    def data(self) -> bytes:
+        return self.path.read_bytes()
+
+    def partition(self, label: str) -> Partition:
+        for p in self.partitions:
+            if p.label == label:
+                return p
+        raise ImageError(f"partition {label!r} not in image")
+
+    @property
+    def partition_table(self) -> bytes:
+        return self.data[PT_OFFSET:PT_OFFSET + PT_SIZE]
+
+    def app_bytes(self) -> bytes:
+        """The application image stored in the ota_0 region of the merged image."""
+        # No stripping of trailing 0xFF: the image ends in a SHA-256 digest
+        # that may legitimately end in 0xFF. The merged file ends with the app.
+        ota0 = self.partition("ota_0")
+        return self.data[ota0.offset:ota0.offset + ota0.size]
+
+    def blank_otadata(self) -> bytes:
+        """Erased otadata: the bootloader then boots ota_0."""
+        return b"\xff" * self.partition("otadata").size
+
+
+def parse_partition_table(raw: bytes) -> tuple[Partition, ...]:
+    parts = []
+    for i in range(0, len(raw) - 31, 32):
+        entry = raw[i:i + 32]
+        magic = entry[:2]
+        if magic == b"\xaa\x50":
+            _, ptype, sub, off, size = struct.unpack_from("<HBBII", entry)
+            label = entry[12:28].split(b"\0")[0].decode("ascii", "replace")
+            parts.append(Partition(label, ptype, sub, off, size))
+        elif magic in (b"\xeb\xeb", b"\xff\xff"):   # MD5 entry / end
+            break
+        else:
+            raise ImageError(f"corrupt partition table entry at 0x{PT_OFFSET + i:x}")
+    return tuple(parts)
+
+
+def _app_info(data: bytes, offset: int) -> AppInfo:
+    if len(data) < offset + 0x20 + 256 or data[offset] != IMAGE_MAGIC:
+        raise ImageError(f"no application image at 0x{offset:x}")
+    d = data[offset + 0x20:offset + 0x20 + 256]
+    if struct.unpack_from("<I", d)[0] != APP_DESC_MAGIC:
+        raise ImageError("application has no ESP-IDF app descriptor")
+    s = lambda o, n: d[o:o + n].split(b"\0")[0].decode("ascii", "replace")
+    return AppInfo(project=s(48, 32), version=s(16, 32), built=f"{s(96, 16)} {s(80, 16)}",
+                   idf=s(112, 32), elf_sha=d[144:176].hex())
+
+
+def inspect_image(path: Path, name: str = "", notes: str = "") -> FirmwareImage:
+    data = path.read_bytes()
+    if len(data) < PT_OFFSET + PT_SIZE or data[0] != IMAGE_MAGIC:
+        raise ImageError("not a merged ESP32 image (no bootloader at offset 0)")
+    chip_id = struct.unpack_from("<H", data, 12)[0]
+    if chip_id != ESP32S3_CHIP_ID:
+        raise ImageError(f"image is for chip id {chip_id}, not ESP32-S3")
+    flash_size = FLASH_SIZES.get(data[3] >> 4, "?")
+    parts = parse_partition_table(data[PT_OFFSET:PT_OFFSET + PT_SIZE])
+    labels = {p.label for p in parts}
+    for need in ("nvs", "otadata", "ota_0"):
+        if need not in labels:
+            raise ImageError(f"partition table has no {need!r} partition")
+    ota0 = next(p for p in parts if p.label == "ota_0")
+    app = _app_info(data, ota0.offset)
+    if app.project != "kota-sensorboard":
+        raise ImageError(f"image is {app.project!r}, not kota-sensorboard")
+    return FirmwareImage(path, name or path.name, notes, hashlib.sha256(data).hexdigest(),
+                         flash_size, parts, app)
+
+
+def official_images(manifest: Path = MANIFEST) -> list[FirmwareImage]:
+    """Images from the manifest whose file exists and matches its SHA-256."""
+    if not manifest.exists():
+        return []
+    entries = tomllib.loads(manifest.read_text(encoding="utf-8")).get("image", [])
+    out = []
+    for e in entries:
+        path = manifest.parent / e["file"]
+        if not path.exists():
+            continue
+        img = inspect_image(path, e.get("name", ""), e.get("notes", ""))
+        if img.sha256 != e["sha256"].lower():
+            raise ImageError(f"{path.name}: SHA-256 does not match the manifest - file changed or corrupt")
+        out.append(img)
+    return out

kota_tech/flash/plan.py

@@ -0,0 +1,101 @@
+"""Flash plans: which esptool steps run, in which order.
+
+App-only (default, repairs): check the box has the same partition table,
+then write the app to ota_0 and erase otadata so ota_0 boots. NVS is kept:
+Matter pairing, OTA registration and Wi-Fi survive.
+
+Full (new or wiped boards): write the whole factory image at 0x0, the same
+as the factory flash_all.bat. This erases NVS: pairing and OTA registration
+are lost.
+"""
+
+from __future__ import annotations
+
+import enum
+from dataclasses import dataclass, field
+from pathlib import Path
+
+from .image import PT_OFFSET, PT_SIZE, FirmwareImage
+
+BAUD = "460800"
+
+
+class Mode(str, enum.Enum):
+    APP_ONLY = "app_only"
+    FULL = "full"
+
+
+@dataclass
+class Step:
+    kind: str                  # "backup" | "read_pt" | "write"
+    title: str
+    args: list[str]            # esptool arguments (no interpreter prefix)
+    est_s: int                 # rough duration for the UI
+    output: Path | None = None # file produced by the step (backup / table)
+
+
+@dataclass
+class Plan:
+    mode: Mode
+    image: FirmwareImage
+    port: str
+    steps: list[Step] = field(default_factory=list)
+    workdir: Path | None = None
+
+    def summary(self) -> list[str]:
+        return [f"{i}. {s.title} (~{_dur(s.est_s)})" for i, s in enumerate(self.steps, 1)]
+
+
+def _dur(s: int) -> str:
+    return f"{s // 60} min" if s >= 90 else f"{s} s"
+
+
+def _common(port: str, after: str) -> list[str]:
+    return ["--chip", "esp32s3", "--port", port, "--baud", BAUD,
+            "--before", "default_reset", "--after", after]
+
+
+def build_plan(image: FirmwareImage, mode: Mode, port: str, workdir: Path,
+               backup_to: Path | None = None) -> Plan:
+    workdir.mkdir(parents=True, exist_ok=True)
+    plan = Plan(mode, image, port, workdir=workdir)
+    if backup_to is not None:
+        size = {"4MB": "0x400000", "8MB": "0x800000", "16MB": "0x1000000"}.get(image.flash_size, "0x800000")
+        plan.steps.append(Step(
+            "backup", f"Back up the box's complete flash to {backup_to.name}",
+            _common(port, "no_reset") + ["read_flash", "0", size, str(backup_to)],
+            est_s=200 if size == "0x800000" else 100, output=backup_to))
+
+    write_opts = ["write_flash", "--flash_mode", "keep", "--flash_freq", "keep", "--flash_size", "keep"]
+    if mode == Mode.APP_ONLY:
+        pt_file = workdir / "box_partition_table.bin"
+        plan.steps.append(Step(
+            "read_pt", "Check the box has the same partition layout",
+            _common(port, "no_reset") + ["read_flash", hex(PT_OFFSET), hex(PT_SIZE), str(pt_file)],
+            est_s=5, output=pt_file))
+        app_file = workdir / "app_ota0.bin"
+        ota_file = workdir / "otadata_blank.bin"
+        app_file.write_bytes(image.app_bytes())
+        ota_file.write_bytes(image.blank_otadata())
+        otadata, ota0 = image.partition("otadata"), image.partition("ota_0")
+        plan.steps.append(Step(
+            "write", "Write the firmware app (keeps pairing, OTA registration, settings)",
+            _common(port, "hard_reset") + write_opts + [
+                hex(otadata.offset), str(ota_file), hex(ota0.offset), str(app_file)],
+            est_s=20))
+    else:
+        plan.steps.append(Step(
+            "write", "Write the complete factory image (erases pairing and OTA registration)",
+            _common(port, "hard_reset") + write_opts + ["0x0", str(image.path)],
+            est_s=25))
+    return plan
+
+
+def check_partition_table(box_table: bytes, image: FirmwareImage) -> str | None:
+    """None if App-only is safe, otherwise the reason it is not."""
+    if box_table.strip(b"\xff") == b"":
+        return "The box has no partition table (blank or erased chip). Use Full mode."
+    if box_table != image.partition_table:
+        return ("The box uses a different partition layout than this image. "
+                "App-only could leave it unbootable - use Full mode.")
+    return None

kota_tech/flash/runner.py

@@ -0,0 +1,118 @@
+"""Runs a flash plan: one esptool subprocess per step, in a background thread.
+
+A subprocess (instead of calling esptool in-process) keeps esptool's
+stdout/sys.exit handling away from the GUI and lets the tool read progress
+line by line. Callbacks are invoked from the worker thread.
+"""
+
+from __future__ import annotations
+
+import re
+import subprocess
+import sys
+import threading
+from collections.abc import Callable
+from dataclasses import dataclass
+
+from .plan import Plan, check_partition_table
+
+_PROGRESS = re.compile(r"\((\d{1,3}) ?%\)")
+
+# esptool output -> technician-facing hint
+HINTS = [
+    (re.compile(r"could not open port|Access is denied|PermissionError|Resource busy", re.I),
+     "The USB port is in use. Close other programs that use the sensorbox port (serial monitors, Arduino IDE) and try again."),
+    (re.compile(r"Failed to connect to ESP32-S3|No serial data received|Wrong boot mode", re.I),
+     "The box did not enter flashing mode by itself. Open the case, hold the BOOT button, press and release RESET, "
+     "release BOOT, then press Start again."),
+    (re.compile(r"device reports readiness to read but returned no data|The port disappeared|device disconnected", re.I),
+     "The USB connection dropped. Use a short data-capable USB cable directly on the laptop (no hub) and try again."),
+    (re.compile(r"Invalid head of packet|timed out", re.I),
+     "Communication errors. Try another USB cable or port."),
+]
+
+
+@dataclass
+class Result:
+    ok: bool
+    message: str
+    hint: str = ""
+    failed_step: int | None = None
+
+
+class FlashRunner:
+    def __init__(self, plan: Plan,
+                 on_step: Callable[[int, str], None],
+                 on_progress: Callable[[int], None],
+                 on_output: Callable[[str], None],
+                 on_done: Callable[[Result], None],
+                 esptool_cmd: list[str] | None = None):
+        self.plan = plan
+        self._on_step, self._on_progress = on_step, on_progress
+        self._on_output, self._on_done = on_output, on_done
+        self._cmd = esptool_cmd or [sys.executable, "-m", "esptool"]
+        self._thread: threading.Thread | None = None
+
+    def start(self) -> None:
+        self._thread = threading.Thread(target=self._run, name="flash", daemon=True)
+        self._thread.start()
+
+    def join(self, timeout: float | None = None) -> None:
+        if self._thread:
+            self._thread.join(timeout)
+
+    def _run(self) -> None:
+        try:
+            self._on_done(self._execute())
+        except Exception as exc:  # never leave the UI waiting
+            self._on_done(Result(False, f"Internal error: {exc}"))
+
+    def _execute(self) -> Result:
+        for i, step in enumerate(self.plan.steps):
+            self._on_step(i, step.title)
+            self._on_progress(0)
+            code, output = self._esptool(step.args)
+            if code != 0:
+                return Result(False, f"Step {i + 1} failed: {step.title}", _hint(output), i)
+            if step.kind == "read_pt":
+                problem = check_partition_table(step.output.read_bytes(), self.plan.image)
+                if problem:
+                    return Result(False, problem, failed_step=i)
+            self._on_progress(100)
+        return Result(True, "Firmware written and verified by esptool.")
+
+    def _esptool(self, args: list[str]) -> tuple[int, str]:
+        cmd = self._cmd + args
+        self._on_output("$ esptool " + " ".join(args))
+        flags = subprocess.CREATE_NO_WINDOW if sys.platform == "win32" else 0
+        proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
+                                creationflags=flags)
+        collected: list[str] = []
+        buf = b""
+        assert proc.stdout is not None
+        while chunk := proc.stdout.read1(4096):   # returns as soon as bytes arrive
+            buf += chunk
+            # esptool redraws progress with '\r'; treat it as a line break.
+            *lines, buf = re.split(rb"[\r\n]", buf)
+            for raw in lines:
+                self._line(raw, collected)
+        if buf:
+            self._line(buf, collected)
+        return proc.wait(), "\n".join(collected)
+
+    def _line(self, raw: bytes, collected: list[str]) -> None:
+        text = raw.decode("utf-8", "replace").strip()
+        if not text:
+            return
+        collected.append(text)
+        if m := _PROGRESS.search(text):
+            self._on_progress(min(int(m.group(1)), 100))
+            return   # progress lines are not worth listing one by one
+        self._on_output(text)
+
+
+def _hint(output: str) -> str:
+    for pattern, hint in HINTS:
+        if pattern.search(output):
+            return hint
+    return "See the esptool output below. Save it and send it to the firmware team if the problem repeats."

kota_tech/ui/cheatsheet.py

@@ -40,7 +40,8 @@ HINTS = [
     "reboot name the cause.",
     "<b>Small LED next to the RGB LED</b> blinks once per second while the "
     "firmware runs. Not blinking = firmware hung or not running.",
-    "<b>Outside the case</b>: power switch and the Matter button. Holding the "
+    "<b>Outside the case</b> (back): power switch, the <b>microphone switch</b> just above it "
+    "(off = no noise measurements), and the Matter button. Holding the "
     "Matter button <b>5 s</b> factory-resets the box (it forgets its Matter "
     "network and must be commissioned again with the sticker QR code).",
     "<b>Inside the case</b> (unscrew): RESET and BOOT buttons and the SD card. "
@@ -55,7 +56,8 @@ STEPS = [
     "Open the <b>Serial monitor</b> tab, choose the sensorbox port, press "
     "<b>Connect</b>.",
     "Press <b>Reset &amp; capture</b> to record a full boot log from the first line.",
-    "Note the RGB LED colour and compare with the table below.",
+    "Read the <b>Diagnosis</b> panel on the right, then open <b>Guided troubleshooting</b> "
+    "and start <b>Quick check</b>: the tool asks what you see and checks the log live.",
 ]
 
 

kota_tech/ui/flash_tab.py

@@ -0,0 +1,309 @@
+"""Flash firmware tab: official image only, App-only by default."""
+
+from __future__ import annotations
+
+import datetime as dt
+import tempfile
+from pathlib import Path
+
+from PySide6.QtCore import QObject, Qt, QTimer, Signal
+from PySide6.QtWidgets import (
+    QButtonGroup,
+    QCheckBox,
+    QComboBox,
+    QGroupBox,
+    QHBoxLayout,
+    QLabel,
+    QMessageBox,
+    QPlainTextEdit,
+    QProgressBar,
+    QPushButton,
+    QRadioButton,
+    QVBoxLayout,
+    QWidget,
+)
+
+from ..core.session import SESSIONS_DIR
+from ..flash.image import FirmwareImage, ImageError, official_images
+from ..flash.plan import Mode, build_plan
+from ..flash.runner import FlashRunner, Result
+from ..serialio.ports import PortInfo, list_serial_ports
+
+BACKUP_DIR = SESSIONS_DIR.parent / "backups"
+VERIFY_TIMEOUT_MS = 45_000
+
+HELP = (
+    "<b>If flashing cannot connect:</b> use a data-capable USB cable directly on the laptop, close "
+    "other programs using the port, then retry. Last resort (case must be opened): hold <b>BOOT</b>, "
+    "press and release <b>RESET</b>, release <b>BOOT</b>, and press Start again."
+)
+
+
+class _Bridge(QObject):
+    step = Signal(int, str)
+    progress = Signal(int)
+    output = Signal(str)
+    done = Signal(object)
+
+
+class FlashTab(QWidget):
+    def __init__(self, serial_tab, parent: QWidget | None = None):
+        super().__init__(parent)
+        self.serial_tab = serial_tab
+        self._images: list[FirmwareImage] = []
+        self._ports: list[PortInfo] = []   # before any signal can call _update()
+        self._runner: FlashRunner | None = None
+        self._port: PortInfo | None = None
+        self._image: FirmwareImage | None = None
+
+        # 1. box
+        box = QGroupBox("1. Sensorbox")
+        self.port_combo = QComboBox(minimumWidth=360)
+        refresh = QPushButton("Refresh")
+        refresh.clicked.connect(self.refresh_ports)
+        self.box_fw = QLabel(wordWrap=True)
+        bl = QVBoxLayout(box)
+        row = QHBoxLayout()
+        row.addWidget(self.port_combo)
+        row.addWidget(refresh)
+        row.addStretch(1)
+        bl.addLayout(row)
+        bl.addWidget(self.box_fw)
+
+        # 2. firmware
+        fwbox = QGroupBox("2. Firmware (official images only)")
+        self.image_combo = QComboBox(minimumWidth=360)
+        self.image_info = QLabel(wordWrap=True)
+        self.image_info.setTextInteractionFlags(Qt.TextInteractionFlag.TextSelectableByMouse)
+        fl = QVBoxLayout(fwbox)
+        fl.addWidget(self.image_combo)
+        fl.addWidget(self.image_info)
+
+        # 3. mode
+        modebox = QGroupBox("3. What to write")
+        self.rb_app = QRadioButton("App only  (recommended for repairs)")
+        self.rb_full = QRadioButton("Full factory image  (new or completely wiped boards)")
+        self.mode_group = QButtonGroup(self)
+        self.mode_group.addButton(self.rb_app)
+        self.mode_group.addButton(self.rb_full)
+        self.rb_app.setChecked(True)
+        app_note = QLabel("Replaces the firmware only. Keeps the Matter pairing, the OTA registration and the "
+                          "settings stored on the box.", wordWrap=True)
+        full_note = QLabel("Writes everything like the factory. <b>Erases the Matter pairing and the OTA "
+                           "registration</b> - the box must be paired again afterwards.", wordWrap=True)
+        for n in (app_note, full_note):
+            n.setContentsMargins(24, 0, 0, 6)
+            n.setStyleSheet("color:#555")
+        self.confirm_full = QCheckBox("I understand the pairing and OTA registration will be erased")
+        self.backup = QCheckBox("Back up the box's complete flash first (8 MB, about 3 minutes)")
+        ml = QVBoxLayout(modebox)
+        for w in (self.rb_app, app_note, self.rb_full, full_note, self.confirm_full, self.backup):
+            ml.addWidget(w)
+
+        # 4. run
+        runbox = QGroupBox("4. Flash")
+        self.plan_label = QLabel(wordWrap=True)
+        self.start_btn = QPushButton("Start flashing")
+        self.start_btn.setMinimumHeight(36)
+        self.start_btn.clicked.connect(self._start)
+        self.step_label = QLabel()
+        self.bar = QProgressBar()
+        self.result = QLabel(wordWrap=True)
+        self.result.setMargin(8)
+        self.result.setTextFormat(Qt.TextFormat.RichText)
+        self.details_btn = QPushButton("Show esptool output")
+        self.details_btn.setCheckable(True)
+        self.output = QPlainTextEdit(readOnly=True)
+        self.output.setVisible(False)
+        self.details_btn.toggled.connect(self.output.setVisible)
+        rl = QVBoxLayout(runbox)
+        for w in (self.plan_label, self.start_btn, self.step_label, self.bar, self.result, self.details_btn, self.output):
+            rl.addWidget(w)
+        help_lbl = QLabel(HELP, wordWrap=True)
+        help_lbl.setStyleSheet("color:#555")
+        rl.addWidget(help_lbl)
+        rl.addStretch(1)   # keep the run column packed at the top
+
+        left = QVBoxLayout()
+        for w in (box, fwbox, modebox):
+            left.addWidget(w)
+        left.addStretch(1)
+        lay = QHBoxLayout(self)
+        lay.addLayout(left, 1)
+        lay.addWidget(runbox, 1)
+
+        self._bridge = _Bridge()
+        self._bridge.step.connect(self._on_step)
+        self._bridge.progress.connect(self.bar.setValue)
+        self._bridge.output.connect(self.output.appendPlainText)
+        self._bridge.done.connect(self._on_done)
+        self._verify_timer = QTimer(self, interval=500)
+        self._verify_timer.timeout.connect(self._check_verify)
+
+        for sig in (self.rb_app.toggled, self.confirm_full.toggled, self.backup.toggled):
+            sig.connect(self._update)
+        self.rb_full.toggled.connect(lambda on: self.backup.setChecked(on))  # backup default on for Full
+        self.image_combo.currentIndexChanged.connect(self._update)
+        self.port_combo.currentIndexChanged.connect(self._update)
+
+        self._load_images()
+        self.refresh_ports()
+        self._show_result("", None)
+
+    # ------------------------------------------------------------ setup
+    def _load_images(self) -> None:
+        try:
+            self._images = official_images()
+        except ImageError as exc:
+            self._images = []
+            self.image_info.setText(f"<span style='color:#b03a2e'><b>Firmware file problem:</b> {exc}</span>")
+        self.image_combo.clear()
+        for img in self._images:
+            self.image_combo.addItem(img.name)
+        if not self._images:
+            self.image_combo.addItem("No official firmware image found in the firmware folder")
+
+    def refresh_ports(self) -> None:
+        current = self.port_combo.currentData()
+        self._ports = list_serial_ports()
+        self.port_combo.clear()
+        for p in self._ports:
+            self.port_combo.addItem(p.label, p.device)
+        if not self._ports:
+            self.port_combo.addItem("No sensorbox found - check USB cable and power switch", None)
+        self.port_combo.setCurrentIndex(max(self.port_combo.findData(current), 0))
+        self._update()
+
+    def showEvent(self, event):  # noqa: N802 - refresh when the tab is opened
+        self.refresh_ports()
+        super().showEvent(event)
+
+    # ------------------------------------------------------------ state
+    def _selected_image(self) -> FirmwareImage | None:
+        i = self.image_combo.currentIndex()
+        return self._images[i] if 0 <= i < len(self._images) else None
+
+    def _selected_port(self) -> PortInfo | None:
+        dev = self.port_combo.currentData()
+        return next((p for p in self._ports if p.device == dev), None)
+
+    def _update(self) -> None:
+        img = self._selected_image()
+        if img:
+            a = img.app
+            self.image_info.setText(
+                f"{a.project} {a.version}, built {a.built}, ESP-IDF {a.idf}<br>"
+                f"<small>build {a.elf_sha[:9]} &middot; file SHA-256 {img.sha256[:12]}... verified</small><br>"
+                f"<small>{img.notes}</small>")
+        fw = self.serial_tab.engine.firmware
+        if fw.elf_sha and img:
+            same = fw.elf_sha.startswith(img.app.elf_sha[:9]) or img.app.elf_sha.startswith(fw.elf_sha)
+            msg = f"Box currently runs: {fw.describe()}"
+            if same:
+                msg += "<br><i>It already has this firmware. Re-flash only if you suspect the firmware is damaged.</i>"
+            else:
+                msg += ("<br><b style='color:#c77c02'>The box runs a different build (probably updated over OTA). "
+                        "Flashing puts the older factory image back; the box updates itself again once online.</b>")
+        else:
+            msg = "Firmware on the box: unknown - connect in the Serial monitor and press Reset & capture to see it."
+        self.box_fw.setText(msg)
+
+        self.confirm_full.setVisible(self.rb_full.isChecked())
+        ok = bool(img and self._selected_port() and self._runner is None
+                  and (self.rb_app.isChecked() or self.confirm_full.isChecked()))
+        self.start_btn.setEnabled(ok)
+        if img and self._selected_port():
+            mode = Mode.APP_ONLY if self.rb_app.isChecked() else Mode.FULL
+            steps = ["Back up the complete flash (~3 min)"] if self.backup.isChecked() else []
+            if mode == Mode.APP_ONLY:
+                steps += ["Check the box has the same partition layout", "Write the firmware app (~20 s)"]
+            else:
+                steps += ["Write the complete factory image (~25 s)"]
+            steps += ["Restart the box and verify the new firmware boots"]
+            self.plan_label.setText("<b>Plan:</b><ol>" + "".join(f"<li>{s}</li>" for s in steps) + "</ol>")
+        else:
+            self.plan_label.setText("Select a sensorbox and a firmware image.")
+
+    # ------------------------------------------------------------ flash
+    def _start(self) -> None:
+        img, port = self._selected_image(), self._selected_port()
+        if not img or not port:
+            return
+        mode = Mode.APP_ONLY if self.rb_app.isChecked() else Mode.FULL
+        what = ("the firmware app (pairing and settings are kept)" if mode == Mode.APP_ONLY
+                else "the COMPLETE factory image (pairing and OTA registration are erased)")
+        if QMessageBox.question(self, "Flash firmware",
+                                f"Write {what}\n\nImage: {img.name}\nBox: {port.label}\n\n"
+                                "Keep the box powered and the USB cable connected until it finishes.",
+                                QMessageBox.StandardButton.Ok | QMessageBox.StandardButton.Cancel
+                                ) != QMessageBox.StandardButton.Ok:
+            return
+        backup_to = None
+        if self.backup.isChecked():
+            BACKUP_DIR.mkdir(parents=True, exist_ok=True)
+            stamp = dt.datetime.now().strftime("%Y%m%d_%H%M%S")
+            backup_to = BACKUP_DIR / f"{(port.mac or port.device).replace(':', '')}_{stamp}.bin"
+        plan = build_plan(img, mode, port.device, Path(tempfile.mkdtemp(prefix="kota_flash_")), backup_to)
+
+        self._port, self._image = port, img
+        self.serial_tab.release_port()          # esptool needs the port exclusively
+        self.output.clear()
+        self.output.appendPlainText("\n".join(plan.summary()))
+        self._show_result("", None)
+        self._runner = FlashRunner(plan, self._bridge.step.emit, self._bridge.progress.emit,
+                                   self._bridge.output.emit, self._bridge.done.emit)
+        self._set_busy(True)
+        self._runner.start()
+
+    def _set_busy(self, busy: bool) -> None:
+        for w in (self.port_combo, self.image_combo, self.rb_app, self.rb_full, self.backup, self.confirm_full):
+            w.setEnabled(not busy)
+        self._update()
+
+    def _on_step(self, i: int, title: str) -> None:
+        n = len(self._runner.plan.steps) if self._runner else 0
+        self.step_label.setText(f"Step {i + 1} of {n + 1}: {title}")
+
+    def _on_done(self, res: Result) -> None:
+        self._runner = None
+        if not res.ok:
+            self._set_busy(False)
+            self.step_label.setText("Stopped.")
+            hint = f"<p>{res.hint}</p>" if res.hint else ""
+            self._show_result(f"<b>Flashing failed.</b> {res.message}{hint}", "error")
+            self.details_btn.setChecked(True)
+            return
+        self.step_label.setText("Final step: restarting the box and checking which firmware it boots...")
+        self.bar.setValue(0)
+        self._show_result("Firmware written. Waiting for the box to start...", "info")
+        self.serial_tab.connect_port(self._port, capture=True)
+        self._verify_ms = 0
+        self._verify_timer.start()
+
+    def _check_verify(self) -> None:
+        self._verify_ms += self._verify_timer.interval()
+        self.bar.setValue(min(100, int(100 * self._verify_ms / VERIFY_TIMEOUT_MS)))
+        fw = self.serial_tab.engine.firmware
+        want = self._image.app.elf_sha[:9]
+        done = fw.elf_sha is not None and fw.elf_sha.startswith(want)
+        if done or self._verify_ms >= VERIFY_TIMEOUT_MS:
+            self._verify_timer.stop()
+            self._set_busy(False)
+            self.bar.setValue(100)
+            if done:
+                self.step_label.setText("Done.")
+                self._show_result(f"<b>Success.</b> The box boots the new firmware (build {want}). "
+                                  "Check the Diagnosis panel in the Serial monitor.", "ok")
+            else:
+                seen = fw.elf_sha[:9] if fw.elf_sha else "no boot seen"
+                self._show_result(f"<b>Written, but not verified.</b> Expected build {want}, saw: {seen}. "
+                                  "Open the Serial monitor and press Reset & capture.", "warning")
+
+    def _show_result(self, html: str, kind: str | None) -> None:
+        colours = {"ok": ("#2e9e44", "#e3f4e7"), "info": ("#2e6da4", "#e3edf7"),
+                   "warning": ("#c77c02", "#fdf0d6"), "error": ("#d9534f", "#f9e0df")}
+        self.result.setVisible(bool(html))
+        if html:
+            border, bg = colours[kind or "info"]
+            self.result.setStyleSheet(f"QLabel {{ border:2px solid {border}; background:{bg}; border-radius:6px; }}")
+            self.result.setText(html)

kota_tech/ui/guide_panel.py

@@ -0,0 +1,216 @@
+"""Guided troubleshooting panel: renders a diag.guides.GuideRunner."""
+
+from __future__ import annotations
+
+from PySide6.QtCore import QSize, Qt
+from PySide6.QtGui import QBrush, QColor, QIcon, QLinearGradient, QPainter, QPixmap
+from PySide6.QtWidgets import (
+    QFrame,
+    QHBoxLayout,
+    QLabel,
+    QListWidget,
+    QListWidgetItem,
+    QProgressBar,
+    QPushButton,
+    QVBoxLayout,
+    QWidget,
+)
+
+from ..diag.engine import LED, DiagnosticsEngine
+from ..diag.guides import GuideRunner, recommended
+
+END_STYLE = {  # end severity -> (border, background)
+    "ok": ("#2e9e44", "#e3f4e7"),
+    "info": ("#2e6da4", "#e3edf7"),
+    "warning": ("#c77c02", "#fdf0d6"),
+    "error": ("#d9534f", "#f9e0df"),
+    "critical": ("#b03a2e", "#f6d5d1"),
+}
+
+
+def _swatch(key: str, size: int = 22) -> QIcon:
+    """Round LED-colour icon; CYCLING is drawn as a blue-dark-red gradient."""
+    pm = QPixmap(size, size)
+    pm.fill(QColor(0, 0, 0, 0))
+    p = QPainter(pm)
+    p.setRenderHint(QPainter.RenderHint.Antialiasing)
+    if key == "CYCLING":
+        g = QLinearGradient(0, 0, size, 0)
+        for stop, c in ((0.0, "#2f6fd6"), (0.5, "#444444"), (1.0, "#d64541")):
+            g.setColorAt(stop, QColor(c))
+        p.setBrush(QBrush(g))
+    else:
+        p.setBrush(QColor(LED.get(key, ("", "#888888"))[1]))
+    p.setPen(QColor("#777777"))
+    p.drawEllipse(1, 1, size - 2, size - 2)
+    p.end()
+    return QIcon(pm)
+
+
+def _esc(s: str) -> str:
+    return s.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
+
+
+class GuidePanel(QWidget):
+    def __init__(self, runner: GuideRunner, engine: DiagnosticsEngine, parent: QWidget | None = None):
+        super().__init__(parent)
+        self.runner, self.engine = runner, engine
+        self._shown_key: tuple | None = None
+
+        # --- picker (no guide running)
+        self.picker = QWidget()
+        pl = QVBoxLayout(self.picker)
+        pl.setContentsMargins(0, 0, 0, 0)
+        pl.addWidget(QLabel("<b>Recommended checks for this box</b> (based on the log):"))
+        self.guide_list = QListWidget()
+        self.guide_list.itemDoubleClicked.connect(lambda it: self._start(it.data(Qt.ItemDataRole.UserRole)))
+        pl.addWidget(self.guide_list, 1)
+        self.start_btn = QPushButton("Start selected check")
+        self.start_btn.clicked.connect(self._start_selected)
+        pl.addWidget(self.start_btn)
+
+        # --- running guide
+        self.card = QFrame()
+        self.card.setFrameShape(QFrame.Shape.StyledPanel)
+        cl = QVBoxLayout(self.card)
+        self.guide_title = QLabel()
+        self.guide_title.setStyleSheet("color:#666")
+        self.step_text = QLabel(wordWrap=True)
+        f = self.step_text.font()
+        f.setPointSize(f.pointSize() + 2)
+        self.step_text.setFont(f)
+        self.step_text.setTextFormat(Qt.TextFormat.RichText)
+        self.options = QVBoxLayout()
+        self.wait_bar = QProgressBar()
+        self.wait_bar.setTextVisible(False)
+        self.wait_label = QLabel()
+        self.note = QLabel(wordWrap=True)
+        self.note.setStyleSheet("color:#b03a2e")
+        self.continue_btn = QPushButton("Continue")
+        self.continue_btn.clicked.connect(self._proceed)
+        self.skip_btn = QPushButton("Skip waiting / it did not work")
+        self.skip_btn.clicked.connect(self._proceed)
+        self.end_box = QLabel(wordWrap=True)
+        self.end_box.setTextFormat(Qt.TextFormat.RichText)
+        self.end_box.setMargin(10)
+        for w in (self.guide_title, self.step_text):
+            cl.addWidget(w)
+        cl.addLayout(self.options)
+        for w in (self.wait_label, self.wait_bar, self.note, self.continue_btn, self.skip_btn, self.end_box):
+            cl.addWidget(w)
+        cl.addStretch(1)
+        nav = QHBoxLayout()
+        self.back_btn = QPushButton("← Back")
+        self.back_btn.clicked.connect(self._back)
+        self.done_btn = QPushButton("Back to checks list")
+        self.done_btn.clicked.connect(self._cancel)
+        nav.addWidget(self.back_btn)
+        nav.addStretch(1)
+        nav.addWidget(self.done_btn)
+        cl.addLayout(nav)
+
+        lay = QVBoxLayout(self)
+        lay.setContentsMargins(4, 0, 0, 0)
+        lay.addWidget(self.picker, 1)
+        lay.addWidget(self.card, 1)
+        self.refresh()
+
+    # ------------------------------------------------------------ actions
+    def _start_selected(self) -> None:
+        it = self.guide_list.currentItem() or self.guide_list.item(0)
+        if it:
+            self._start(it.data(Qt.ItemDataRole.UserRole))
+
+    def _start(self, guide_id: str) -> None:
+        self.runner.start(guide_id)
+        self.refresh()
+
+    def _answer(self, key: str) -> None:
+        self.runner.answer(key)
+        self.refresh()
+
+    def _proceed(self) -> None:
+        self.runner.proceed()
+        self.refresh()
+
+    def _back(self) -> None:
+        self.runner.back()
+        self.refresh()
+
+    def _cancel(self) -> None:
+        self.runner.cancel()
+        self.refresh()
+
+    # ------------------------------------------------------------- render
+    def refresh(self) -> None:
+        """Called after every interaction and periodically (timeouts, countdown)."""
+        self.runner.tick()
+        v = self.runner.view()
+        running = v.guide is not None
+        self.picker.setVisible(not running)
+        self.card.setVisible(running)
+        if not running:
+            self._fill_picker()
+            self._shown_key = None
+            return
+        key = (v.guide.id, v.step.id if v.step else None, v.end.id if v.end else None)
+        if key != self._shown_key:
+            self._shown_key = key
+            self._render_step(v)
+        if v.waiting:
+            total = v.step.timeout_s
+            self.wait_bar.setMaximum(int(total))
+            self.wait_bar.setValue(int(total - v.remaining_s))
+            m, s = divmod(int(v.remaining_s), 60)
+            self.wait_label.setText(f"Watching the live log... {m}:{s:02d} left")
+        self.note.setText(v.note)
+        self.note.setVisible(bool(v.note))
+        self.back_btn.setEnabled(v.can_back)
+
+    def _fill_picker(self) -> None:
+        wanted = [(g.id, g.title, g.summary) for g in recommended(self.runner.guides, self.engine)]
+        current = [(self.guide_list.item(i).data(Qt.ItemDataRole.UserRole)) for i in range(self.guide_list.count())]
+        if [w[0] for w in wanted] == current:
+            return
+        self.guide_list.clear()
+        for gid, title, summary in wanted:
+            it = QListWidgetItem(f"{title}\n    {summary}")
+            it.setData(Qt.ItemDataRole.UserRole, gid)
+            self.guide_list.addItem(it)
+        self.guide_list.setCurrentRow(0)
+
+    def _render_step(self, v) -> None:
+        self.guide_title.setText(v.guide.title)
+        while self.options.count():
+            w = self.options.takeAt(0).widget()
+            if w:
+                # Detach now; deleteLater alone leaves it visible until the
+                # event loop processes the deferred delete.
+                w.hide()
+                w.setParent(None)
+                w.deleteLater()
+        is_end = v.end is not None
+        self.step_text.setVisible(not is_end)
+        self.step_text.setText(_esc(v.text))
+        for opt_key, label in v.options:
+            b = QPushButton(label)
+            b.setMinimumHeight(34)
+            if v.step and v.step.type == "led":
+                b.setIcon(_swatch(opt_key))
+                b.setIconSize(QSize(22, 22))
+                b.setStyleSheet("QPushButton { text-align:left; padding-left:10px; }")
+            b.clicked.connect(lambda _=False, k=opt_key: self._answer(k))
+            self.options.addWidget(b)
+        step_type = v.step.type if v.step else None
+        self.continue_btn.setVisible(step_type == "info")
+        self.skip_btn.setVisible(step_type == "wait")
+        self.wait_bar.setVisible(step_type == "wait")
+        self.wait_label.setVisible(step_type == "wait")
+        self.end_box.setVisible(is_end)
+        if is_end:
+            e = v.end
+            border, bg = END_STYLE.get(e.severity, END_STYLE["info"])
+            acts = "".join(f"<li>{_esc(a)}</li>" for a in e.actions)
+            self.end_box.setStyleSheet(f"QLabel {{ border:2px solid {border}; background:{bg}; border-radius:6px; }}")
+            self.end_box.setText(f"<h3 style='margin:0'>{_esc(e.title)}</h3><p>{_esc(e.text)}</p>"
+                                 + (f"<ol>{acts}</ol>" if acts else ""))

kota_tech/ui/main_window.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from pathlib import Path
 
-from PySide6.QtCore import QObject, Qt, QTimer, QUrl, Signal
+from PySide6.QtCore import QCoreApplication, QObject, Qt, QTimer, QUrl, Signal
 from PySide6.QtGui import QColor, QDesktopServices, QFont, QGuiApplication, QTextCharFormat, QTextCursor
 from PySide6.QtWidgets import (
     QCheckBox,
@@ -22,13 +22,16 @@ from PySide6.QtWidgets import (
 
 from .. import __version__
 from ..core.logfile import read_log_file
-from ..core.logline import LineKind, LogLine
+from ..core.logline import LineKind, LogLine, host_event
 from ..core.session import SessionLog
 from ..diag.engine import DiagnosticsEngine
+from ..diag.guides import GuideRunner
 from ..serialio.manager import SerialManager, State
 from ..serialio.ports import PortInfo, list_serial_ports
 from .cheatsheet import cheatsheet_html
 from .diag_panel import DiagnosticsPanel
+from .flash_tab import FlashTab
+from .guide_panel import GuidePanel
 
 MAX_LINES = 20000
 LEVEL_FILTERS = {"All lines": None, "Warnings + errors": {"W", "E"}, "Errors only": {"E"}}
@@ -63,6 +66,7 @@ class SerialTab(QWidget):
         self._counts = {"E": 0, "W": 0, "boots": 0}
         self._engine = DiagnosticsEngine()
         self._diag_dirty = True
+        self._runner = GuideRunner(self._engine, on_action=self._guide_action, on_log=self._guide_log)
 
         # --- controls
         self.port_combo = QComboBox(minimumWidth=320)
@@ -102,9 +106,13 @@ class SerialTab(QWidget):
         self.view.setStyleSheet("QPlainTextEdit { background:#1e1e1e; color:#d4d4d4; }")
 
         self.diag = DiagnosticsPanel()
+        self.guide = GuidePanel(self._runner, self._engine)
+        self.side_tabs = QTabWidget()
+        self.side_tabs.addTab(self.diag, "Diagnosis")
+        self.side_tabs.addTab(self.guide, "Guided troubleshooting")
         split = QSplitter(Qt.Orientation.Horizontal)
         split.addWidget(self.view)
-        split.addWidget(self.diag)
+        split.addWidget(self.side_tabs)
         split.setStretchFactor(0, 3)
         split.setStretchFactor(1, 2)
         split.setSizes([700, 480])
@@ -173,14 +181,46 @@ class SerialTab(QWidget):
         port = self._selected_port()
         if port is None:
             return
+        self._connect(port)
+
+    def _connect(self, port: PortInfo) -> None:
         self._counts = {"E": 0, "W": 0, "boots": 0}
         self._engine.reset()
+        self._runner.cancel()
         self._diag_dirty = True
         self._session.start(port.mac or port.device)
         self._manager.connect(port)
 
+    # ---- hand-off with the flash tab ------------------------------------
+    @property
+    def engine(self) -> DiagnosticsEngine:
+        return self._engine
+
+    def release_port(self) -> None:
+        """Stop monitoring so esptool can open the port exclusively."""
+        if self._manager.is_running:
+            self._manager.disconnect()          # joins the reader thread
+            QCoreApplication.processEvents()    # deliver its queued final lines/state now
+
+    def connect_port(self, port: PortInfo, capture: bool = True) -> None:
+        """Monitor `port`; with capture, restart the box once connected to record its boot."""
+        self.release_port()
+        idx = self.port_combo.findData(port.device)
+        if idx < 0:
+            self.port_combo.addItem(port.label, port.device)
+            self._ports.append(port)
+            idx = self.port_combo.count() - 1
+        self.port_combo.setCurrentIndex(idx)
+        self._reset_on_connect = capture
+        self._connect(port)
+
     def _on_state(self, state: State, detail: str) -> None:
         running = state != State.DISCONNECTED
+        if not running and self._manager.is_running:
+            return  # stale event from a session that was already replaced
+        if state == State.CONNECTED and getattr(self, "_reset_on_connect", False):
+            self._reset_on_connect = False
+            QTimer.singleShot(300, self._manager.reset_board)
         if not running and self._session.path is not None:
             self._session.write_report(self._engine.report().to_text())
             self._session.stop()
@@ -206,6 +246,7 @@ class SerialTab(QWidget):
     def _on_line(self, line: LogLine) -> None:
         self._session.write(line)
         self._engine.feed(line)
+        self._runner.feed(line)
         self._diag_dirty = True
         if line.kind == LineKind.BOOT:
             self._counts["boots"] += 1
@@ -240,6 +281,21 @@ class SerialTab(QWidget):
         if self._diag_dirty:
             self._diag_dirty = False
             self.diag.show_report(self._engine.report())
+        self.guide.refresh()   # countdowns and timeouts need a steady tick
+
+    # ---- guided troubleshooting hooks ------------------------------------
+    def _guide_action(self, action: str) -> bool:
+        if action == "reset" and self._manager.state == State.CONNECTED:
+            self._manager.reset_board()
+            return True
+        return False
+
+    def _guide_log(self, text: str) -> None:
+        # Technician answers go into the session log and the log view.
+        line = host_event(text)
+        self._session.write(line)
+        self._append(line)
+        self._diag_dirty = True
 
     def _copy_report(self) -> None:
         QGuiApplication.clipboard().setText(self._engine.report().to_text())
@@ -252,6 +308,7 @@ class SerialTab(QWidget):
         lines = read_log_file(Path(path))
         self.view.clear()
         self._engine.reset()
+        self._runner.cancel()
         self._counts = {"E": 0, "W": 0, "boots": 0}
         for line in lines:
             self._engine.feed(line)
@@ -290,8 +347,10 @@ class MainWindow(QMainWindow):
         guide = QTextBrowser(openExternalLinks=True)
         guide.setHtml(cheatsheet_html())
         self.serial_tab = SerialTab()
+        self.flash_tab = FlashTab(self.serial_tab)
         tabs.addTab(guide, "Quick start")
         tabs.addTab(self.serial_tab, "Serial monitor")
+        tabs.addTab(self.flash_tab, "Flash firmware")
         self.setCentralWidget(tabs)
 
     def closeEvent(self, event):  # noqa: N802 (Qt naming)

pyproject.toml

@@ -1,11 +1,12 @@
 [project]
 name = "kota-technician-tool"
-version = "0.2.0"
+version = "0.4.0"
 description = "KOTA sensorbox technician diagnostic tool (demo)"
 requires-python = ">=3.11,<3.14"
 dependencies = [
     "pyserial>=3.5",
     "PySide6-Essentials>=6.7",
+    "esptool~=4.8",   # 4.x CLI (write_flash/read_flash); v5 renamed commands
 ]
 
 [dependency-groups]

run_macos.command

@@ -3,7 +3,7 @@
 cd "$(dirname "$0")" || exit 1
 
 # Keep the virtual environment out of the (Google Drive) tool folder.
-export UV_PROJECT_ENVIRONMENT="$HOME/Library/Caches/KotaTechnicianTool/venv-0.2"
+export UV_PROJECT_ENVIRONMENT="$HOME/Library/Caches/KotaTechnicianTool/venv-0.4"
 export PATH="$HOME/.local/bin:$PATH"
 
 if ! command -v uv >/dev/null 2>&1; then

run_windows.bat

@@ -3,7 +3,7 @@ setlocal
 cd /d "%~dp0"
 
 rem Keep the virtual environment out of the (Google Drive) tool folder.
-set "UV_PROJECT_ENVIRONMENT=%LOCALAPPDATA%\KotaTechnicianTool\venv-0.2"
+set "UV_PROJECT_ENVIRONMENT=%LOCALAPPDATA%\KotaTechnicianTool\venv-0.4"
 set "PATH=%USERPROFILE%\.local\bin;%PATH%"
 
 where uv >nul 2>nul

tests/test_flash.py

@@ -0,0 +1,162 @@
+"""Flashing: image validation on the real official image, plan building,
+and the runner against a fake esptool (no hardware)."""
+
+import hashlib
+import sys
+import threading
+from pathlib import Path
+
+import pytest
+
+from kota_tech.flash.image import ImageError, inspect_image, official_images
+from kota_tech.flash.plan import Mode, build_plan, check_partition_table
+from kota_tech.flash.runner import FlashRunner
+
+FW = Path(__file__).resolve().parents[1] / "firmware" / "new_system.bin"
+
+
+@pytest.fixture(scope="module")
+def image():
+    imgs = official_images()
+    assert len(imgs) == 1
+    return imgs[0]
+
+
+# ------------------------------------------------------------------ image
+
+def test_official_image_is_the_deployed_v1_build(image):
+    assert image.app.project == "kota-sensorboard"
+    assert image.app.elf_sha.startswith("45fa9d5b9")       # same as the live board
+    assert image.flash_size == "8MB"
+    assert image.partition("ota_0").offset == 0x40000
+    assert image.partition("otadata").offset == 0x31000
+    assert image.partition("nvs").offset == 0x10000
+
+
+def test_app_bytes_are_a_complete_app_image(image):
+    app = image.app_bytes()
+    assert app[0] == 0xE9
+    assert len(app) == len(image.data) - 0x40000              # ends where the file ends
+    assert len(image.blank_otadata()) == 0x2000 and set(image.blank_otadata()) == {0xFF}
+
+
+def test_modified_image_is_refused(tmp_path):
+    data = bytearray(FW.read_bytes())
+    data[-1] ^= 0xFF
+    bad = tmp_path / "new_system.bin"
+    bad.write_bytes(data)
+    manifest = tmp_path / "firmware.toml"
+    manifest.write_text(f'[[image]]\nfile = "new_system.bin"\nsha256 = "{hashlib.sha256(FW.read_bytes()).hexdigest()}"\n')
+    with pytest.raises(ImageError, match="SHA-256"):
+        official_images(manifest)
+
+
+@pytest.mark.parametrize("patch,msg", [
+    ((0, 0x00), "not a merged"),
+    ((12, 0x05), "not ESP32-S3"),
+])
+def test_wrong_images_are_rejected(tmp_path, patch, msg):
+    data = bytearray(FW.read_bytes())
+    data[patch[0]] = patch[1]
+    p = tmp_path / "x.bin"
+    p.write_bytes(data)
+    with pytest.raises(ImageError, match=msg):
+        inspect_image(p)
+
+
+# ------------------------------------------------------------------- plan
+
+def test_app_only_plan_keeps_nvs(image, tmp_path):
+    plan = build_plan(image, Mode.APP_ONLY, "COM5", tmp_path)
+    kinds = [s.kind for s in plan.steps]
+    assert kinds == ["read_pt", "write"]
+    write = plan.steps[-1].args
+    offsets = [a for a in write if a.startswith("0x")]
+    assert offsets == ["0x31000", "0x40000"]          # otadata + ota_0 only
+    assert "0x10000" not in write and "0x0" not in write   # NVS / bootloader untouched
+    assert write[write.index("--after") + 1] == "hard_reset"
+    assert (tmp_path / "app_ota0.bin").read_bytes() == image.app_bytes()
+
+
+def test_full_plan_with_backup(image, tmp_path):
+    backup = tmp_path / "bk.bin"
+    plan = build_plan(image, Mode.FULL, "COM5", tmp_path, backup_to=backup)
+    assert [s.kind for s in plan.steps] == ["backup", "write"]
+    assert plan.steps[0].args[-3:] == ["0", "0x800000", str(backup)]
+    assert plan.steps[0].args[plan.steps[0].args.index("--after") + 1] == "no_reset"
+    assert plan.steps[1].args[-2:] == ["0x0", str(image.path)]
+    assert "Back up" in plan.summary()[0]
+
+
+def test_partition_table_check(image):
+    assert check_partition_table(image.partition_table, image) is None
+    assert "blank" in check_partition_table(b"\xff" * 0xC00, image)
+    other = bytearray(image.partition_table)
+    other[40] ^= 1
+    assert "different partition layout" in check_partition_table(bytes(other), image)
+
+
+# ----------------------------------------------------------------- runner
+
+FAKE = """
+import sys, pathlib
+args = sys.argv[1:]
+if "read_flash" in args:
+    out = pathlib.Path(args[-1])
+    src = pathlib.Path(r"{fw}").read_bytes()
+    off, size = int(args[-3], 0), int(args[-2], 0)
+    {pt_line}
+    print("Read ... (50 %)", end="\\r"); print("Read ... (100 %)")
+    sys.exit(0)
+if "write_flash" in args:
+    for p in (10, 60, 100):
+        print(f"Writing at 0x00040000... ({{p}} %)", end="\\r", flush=True)
+    print(); print("Hash of data verified.")
+    sys.exit({write_code})
+"""
+
+
+def _fake(tmp_path, write_code=0, pt="same", fail_text=""):
+    pt_line = {"same": "out.write_bytes(src[off:off+size])",
+               "blank": "out.write_bytes(b'\\xff' * size)"}[pt]
+    script = FAKE.format(fw=FW, pt_line=pt_line, write_code=write_code)
+    if fail_text:
+        script = script.replace('print("Hash of data verified.")', f'print("{fail_text}")')
+    f = tmp_path / "fake_esptool.py"
+    f.write_text(script)
+    return [sys.executable, str(f)]
+
+
+def _run(plan, cmd):
+    steps, progress, output, done = [], [], [], threading.Event()
+    result = {}
+    r = FlashRunner(plan, lambda i, t: steps.append(i), progress.append, output.append,
+                    lambda res: (result.setdefault("r", res), done.set()), esptool_cmd=cmd)
+    r.start()
+    assert done.wait(30)
+    return result["r"], steps, progress, output
+
+
+def test_runner_app_only_success(image, tmp_path):
+    plan = build_plan(image, Mode.APP_ONLY, "COM5", tmp_path)
+    res, steps, progress, output = _run(plan, _fake(tmp_path))
+    assert res.ok, res
+    assert steps == [0, 1]
+    assert 60 in progress and progress[-1] == 100
+    assert any("Hash of data verified" in o for o in output)
+
+
+def test_runner_refuses_app_only_on_blank_chip(image, tmp_path):
+    plan = build_plan(image, Mode.APP_ONLY, "COM5", tmp_path)
+    res, steps, *_ = _run(plan, _fake(tmp_path, pt="blank"))
+    assert not res.ok and "Full mode" in res.message
+    assert steps == [0]                       # never reached the write step
+
+
+def test_runner_reports_connect_failure_with_hint(image, tmp_path):
+    plan = build_plan(image, Mode.FULL, "COM5", tmp_path)
+    cmd = _fake(tmp_path, write_code=2,
+                fail_text="A fatal error occurred: Failed to connect to ESP32-S3: No serial data received.")
+    res, *_ = _run(plan, cmd)
+    assert not res.ok and res.failed_step == 0
+    assert "BOOT" in res.hint

tests/test_guides.py

@@ -0,0 +1,244 @@
+"""Guided troubleshooting: runner + engine with simulated technician
+answers, simulated board output and a fake clock."""
+
+from pathlib import Path
+
+import pytest
+
+from kota_tech.core.logfile import read_log_file
+from kota_tech.core.logline import parse_line
+from kota_tech.diag.engine import DiagnosticsEngine, Severity
+from kota_tech.diag.guides import LED_ANSWERS, GuideRunner, load_guides, recommended
+
+FIX = Path(__file__).parent / "fixtures"
+BOOT = ["ESP-ROM:esp32s3-20210327", "rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)",
+        "I (1299) app_init: Project name:     kota-sensorboard",
+        "I (1317) app_init: ELF file SHA256:  45fa9d5b9..."]
+
+
+class Clock:
+    def __init__(self):
+        self.t = 1000.0
+
+    def __call__(self):
+        return self.t
+
+
+@pytest.fixture
+def rig():
+    engine, clock, actions, log = DiagnosticsEngine(), Clock(), [], []
+    runner = GuideRunner(engine, on_action=lambda a: actions.append(a) or True,
+                         on_log=log.append, clock=clock)
+
+    def board(*lines):
+        for ln in lines:
+            parsed = parse_line(ln)
+            engine.feed(parsed)
+            runner.feed(parsed)
+
+    return engine, runner, clock, actions, board, log
+
+
+def _bench(engine):
+    for ln in read_log_file(FIX / "live_boot_A4CB8FC946F8_fw1.0.txt"):
+        engine.feed(ln)
+
+
+def test_all_guides_load_and_validate():
+    guides = load_guides()
+    assert "quick" in guides and len(guides) >= 8
+    led = guides["quick"].steps["led"]
+    assert set(led.route) == set(LED_ANSWERS)   # every colour has a route
+
+
+def test_recommendations_follow_findings(rig):
+    engine, *_ = rig
+    _bench(engine)
+    ids = [g.id for g in recommended(load_guides(), engine)]
+    assert ids[0] == "quick"
+    assert ids.index("network") < ids.index("clock")    # root order preserved
+    assert "mic" in ids
+
+
+def test_purple_uncommissioned_box_skips_to_pairing_and_follows_it_live(rig):
+    engine, runner, clock, _, board, log = rig
+    _bench(engine)                               # log: not commissioned, LED purple
+    runner.start("quick")
+    runner.answer("PURPLE")
+    # "Was it paired before?" is skipped: the log already shows it is not.
+    assert runner.step.id == "pair_intro"
+    runner.proceed()
+    assert runner.view().waiting and runner.step.id == "pair_start"
+    board("I (90000) MAIN: Commissioning session started")
+    assert runner.step.id == "pair_wifi"
+    board("I (95000) MAIN: Commissioning complete")
+    assert runner.step.id == "pair_time"
+    board("I (99000) SNTP: Time synchronized: Sat Sep 26 16:00:00 2026")
+    assert runner.step.id == "pair_upload"
+    board("I (120000) INFLUX: HTTP request performed, status code: 204")
+    assert runner.end.id == "online" and runner.end.severity == "ok"
+    assert any("Paired" in t or "paired" in t for t in engine.technician)
+    assert "matter.not_commissioned" not in {rc.finding.rule_id for rc in engine.report().roots}
+    assert any(l.startswith("technician:") for l in log)
+
+
+def test_pairing_timeout_asks_what_the_app_shows(rig):
+    engine, runner, clock, _, board, _ = rig
+    _bench(engine)
+    runner.start("network")
+    runner.proceed()                             # pair_intro -> pair_start
+    clock.t += 301
+    runner.tick()
+    assert runner.step.id == "not_found"
+    runner.answer("1")
+    assert runner.end.id == "ble_not_found"
+    f = engine.findings["tech.network.ble_not_found"]
+    assert f.severity == Severity.ERROR and f.active
+
+
+def test_led_mismatch_is_recorded(rig):
+    engine, runner, *_ = rig
+    _bench(engine)                               # log implies PURPLE
+    runner.start("quick")
+    runner.answer("GREEN")
+    f = engine.findings["tech.led_mismatch"]
+    assert "Green" in f.title and "Purple" in f.title
+    assert runner.step.id == "heartbeat"
+
+
+def test_led_match_records_nothing(rig):
+    engine, runner, *_ = rig
+    _bench(engine)
+    runner.start("quick")
+    runner.answer("PURPLE")
+    assert "tech.led_mismatch" not in engine.findings
+
+
+def test_blue_reseat_fixed_after_power_cycle(rig):
+    engine, runner, clock, _, board, _ = rig
+    board(*BOOT, "E (3511) MAIN: Failed to initialize RTC: ESP_ERR_TIMEOUT")
+    runner.start("quick")
+    runner.answer("BLUE")
+    runner.proceed()
+    runner.proceed()                             # -> verify (technician power-cycles)
+    assert runner.step.id == "verify"
+    board(*BOOT, "I (14800) temperature_sensor: Range [20°C ~ 100°C], error < 2°C")
+    assert runner.end.id == "i2c_fixed"
+
+
+def test_blue_still_failing_then_module(rig):
+    engine, runner, clock, _, board, _ = rig
+    board(*BOOT, "E (3511) MAIN: Failed to initialize RTC: ESP_ERR_TIMEOUT")
+    runner.start("rtc_i2c")
+    runner.proceed()
+    runner.proceed()
+    board(*BOOT, "E (3511) MAIN: Failed to initialize RTC: ESP_ERR_TIMEOUT")
+    assert runner.step.id == "damaged"
+    runner.answer("1")
+    assert runner.end.id == "rtc_module"
+
+
+def test_white_skips_portal_question_on_v1_firmware(rig):
+    engine, runner, clock, _, board, _ = rig
+    board(*BOOT)                                 # known v1.0: no setup portal
+    runner.start("white")
+    runner.answer("1")                           # nobody held the button
+    assert runner.step.id == "sd_reseat"
+
+
+def test_white_asks_portal_question_on_unknown_firmware(rig):
+    engine, runner, clock, _, board, _ = rig
+    board("ESP-ROM:esp32s3-20210327", "I (1317) app_init: ELF file SHA256:  0123456789...")
+    runner.start("white")
+    runner.answer("1")
+    assert runner.step.id == "portal"
+
+
+def test_red_routes_to_failing_sensor_and_names_it(rig):
+    engine, runner, clock, _, board, _ = rig
+    board(*BOOT, "E (14000) MAIN: Failed to initialize SEN66: ESP_ERR_TIMEOUT")
+    runner.start("sensors")
+    assert runner.step.id == "reseat"
+    assert "SEN66" in runner.view().text
+    runner.proceed()
+    board(*BOOT, "E (14000) MAIN: Failed to initialize SEN66: ESP_ERR_TIMEOUT")
+    assert runner.end.id == "sensor_replace"
+
+
+def test_reboot_loop_resets_board_then_routes_by_cause(rig):
+    engine, runner, clock, actions, board, _ = rig
+    runner.start("reboot_loop")
+    assert actions == ["reset"]
+    board(*BOOT, "E (1519) SD_CARD: Failed to initialize the card (ESP_ERR_TIMEOUT). x")
+    clock.t += 46
+    runner.tick()
+    assert runner.guide.id == "white"
+
+
+def test_reset_action_failure_is_shown(rig):
+    engine = DiagnosticsEngine()
+    runner = GuideRunner(engine, on_action=lambda a: False, clock=Clock())
+    runner.start("reboot_loop")
+    assert "connect" in runner.view().note.lower()
+
+
+def test_mic_switch_flip_verified_without_restart(rig):
+    engine, runner, clock, actions, board, _ = rig
+    _bench(engine)
+    runner.start("mic")
+    assert runner.step.id == "switch"
+    assert "above the power switch" in runner.view().text
+    runner.answer("0")                           # flipped the external switch
+    assert actions == []                         # the firmware re-reads it; no reset
+    board("I (95000) MICROPHONE: Read 300000 bytes in 4936 ms")
+    assert runner.end.id == "mic_on"
+
+
+def test_mic_switch_no_effect_in_both_positions(rig):
+    engine, runner, clock, actions, board, _ = rig
+    _bench(engine)
+    runner.start("mic")
+    runner.answer("0")
+    board("W (95000) MICROPHONE: Microphone is in shutdown state, skipping sample collection")
+    assert runner.step.id == "flip_back"
+    runner.answer("0")
+    board("W (105000) MICROPHONE: Microphone is in shutdown state, skipping sample collection")
+    assert runner.end.id == "mic_switch_faulty"
+
+
+def test_mic_clap_test_detects_dead_mic(rig):
+    engine, runner, clock, _, board, _ = rig
+    board(*BOOT, *["I (20036) MICROPHONE: Sum SQ: 0.000000, RMS pressure: 0.000000, "
+                   "Normalized: 0.000000, dB peak: -inf"] * 2)
+    runner.start("mic")
+    assert runner.step.id == "clap"
+    board("I (30036) MICROPHONE: Sum SQ: 0.000000, RMS pressure: 0.000000, Normalized: 0.000000, dB peak: -inf")
+    clock.t += 46
+    runner.tick()
+    assert runner.end.id == "mic_faulty"
+
+
+def test_mic_clap_test_passes_on_sound(rig):
+    engine, runner, clock, _, board, _ = rig
+    runner.start("mic")
+    board("I (30036) MICROPHONE: Sum SQ: 12.5, RMS pressure: 0.02, Normalized: 0.1, dB peak: 71.3")
+    assert runner.end.id == "mic_ok"
+
+
+def test_back_never_reenters_a_wait(rig):
+    engine, runner, clock, actions, board, _ = rig
+    runner.start("sensors")                      # route -> capture (wait, resets board)
+    assert runner.step.id == "capture" and actions == ["reset"]
+    clock.t += 46
+    runner.tick()                                # -> which_again -> end:red_unclear
+    runner.back()
+    assert actions == ["reset"]                  # no second reset
+
+
+def test_skip_wait_and_report_contains_technician_checks(rig):
+    engine, runner, clock, _, board, _ = rig
+    runner.start("update")
+    runner.proceed()                             # technician skips the wait
+    assert runner.end.id == "update_slow"
+    text = engine.report().to_text()
+    assert "Technician checks:" in text and "Update is taking very long" in text

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