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fix: apply writes locally and shorten the rebuild blackout - #21
Commands felt slower than the Zephyr Connect app for two library reasons. A successful publish returned as soon as the packet was queued, but HoodState did not move until update/accepted. A command that overlapped the credential rebuild also waited on the hood lock for presign, TLS setup, six SUBACKs, and the state GET.
After a successful state.reported publish, show the written keys immediately. Destructive fields (resetgreasefilter, setrecirculating) are not applied locally. update/accepted still merges device-derived keys such as power.
Device-reported state is stored on its own. The visible cache is that state plus pending commands that are still ahead of a newer confirmation of their key, rebuilt whenever a command is retired. An older command stays queued so a reordered echo can match it, and it does not cover a newer confirmation of the same key.
A full get/accepted older than the newest applied version is ignored. A versioned GET is a lower bound for every key, including keys it omits, so a delayed older partial cannot restore an omitted field. update/accepted is a partial merge: a key is applied only when this document is at least as new as that bound, and the cursor does not move backward. A missing version still applies and does not move the cursor. The cursor moves only after the reported block parses. A missing state, or a present state or reported that is not an object (including JSON null, false, 0, and ""), is rejected before either cursor moves. An omitted reported key inside a state object is an empty reported section.
Each queued command belongs to one shadow version: the first write published at a baseline is baseline + 1, the next is baseline + 2, and that version retires that command even when a higher one arrives first. That arithmetic is not exclusive ownership. When an unrelated update already took the version, the late echo of an older same-value command is not given to the command the arithmetic now names, so 1 → 2 → 1 does not show light 2 while the last light 1 is still waiting. A full or partial confirmation has to be newer than that baseline, so a delayed document cannot retire a command published after a newer one. Commands published before any numbered document stay unnumbered. The first numbered echo is not the end of that queue: several commands that publish the same value retire oldest first, and one matching command retires even when it is not the oldest. A numbered document that matches no expected version is not spent on the oldest equal command. It can retire a numbered command when that command is the newest one still pending for every key it carries, and it can also retire a command that is not newest once every key no later command publishes has been seen, so a shared light does not drop fan. When a version belongs to a command, keys that command did not publish are still reconciled, on a hit and on a miss, including an older command the later-command walk does not see. A GET then drops a command a newer echo has already superseded, once the snapshot is past the version that command was waiting for. PROTOCOL.md records the echo as state.reported, so a clientToken is not added. A version is consumed once, including a partial echo that recorded some of a command's keys, so a QoS 1 redelivery cannot retire the next write of the same value or fill a key already recorded. A multi-key command retires when every key has been seen across those echoes. A key already seen is not a conflict when a later partial carries the remaining keys and a newer value for the seen key. One document can still retire a different key it also carries, and a later command that adds a key when every one of its fields is in the document. It cannot retire a second command that published the same fields. A later command may reuse a field already claimed by another command only when this same document fully matches it. Independent commands still collect partial echoes. Publishing 1 then 0, or 1 → 2 → 1, is not confirmed by the older value. A same-version GET does not confirm anything. Disconnect, rejection, and a dead socket clear the baseline counts, consumed versions, missed expected versions, and per-key confirmations along with the queue, so the next session's writes do not keep the old ordinals.
Stop, a credential rebuild, and paho's own disconnect callback drop commands from the session that just died, so a later resync can show a change made during the outage. A write after that callback stays pending over a GET that was already in flight.
On update/rejected, schedule one shadow GET so an optimistic write the device refused does not stick. get/rejected does not schedule another GET. If that GET finds a dead socket, the hood returns to the no-socket shape the supervisor can reopen.
Rebuilds presign the URL and build the TLS context before the old socket is stopped, then release writers once the new session is past CONNACK. SUBACKs and the state GET stay off that lock. The old session is fully disconnected before the new one opens. The credential generation is recorded only when that socket is installed. finish_subscriptions and request_state can disconnect before the handler takes the hood lock, and _read_state_outside_lock does the same. That disconnect publishes one shared loop_stop join before its first await. A writer that arrives then waits on the same join while it holds the hood lock, and does not clear Hood._shadow until the join returns. A second and a third cancellation during the join wait on a shielded join again. That retry does not clear cancellation requests already counted on the caller. The shared future is cleared only after loop_stop has finished, so recovery cannot connect_async on that client ID until then. connect and open_until_connack wait on that same in-flight join before they build the next paho client.
A cancelled write, or a cancelled rejection reread, leaves the same no-socket shape as ZephyrNotConnectedError once disconnect returns: _shadow cleared, not connected, and pending writes dropped, and only when that shadow is still the live one. The clear is after the join. needs_represign stays false while the installed generation still matches, so async_ensure_running is what reopens the socket.
QoS stays 1. Writes stay on state.reported. The supervisor interval is unchanged. Probe CLI sleeps are unchanged.
Tests
pytest, ruff check, and ruff format --check pass with no network. Cases cover the optimistic merge, repeated levels (1 then 0, and 1 → 2 → 1) including every arrival order of their echoes and a version that belongs to another field, a fan echo that arrives before its light echo, one update/accepted that carries both a queued light command and a queued fan command, a later command that adds a key inside that same document, split echoes of one multi-key command, a partial expected echo that must not retire an older subset, a non-contiguous echo after a known baseline and after a disconnect that clears baseline counts, whose GET shows the device value with an empty queue, commands published before any numbered document where the first echo retires the older write and the newer repeat stays over the next GET until its own echo, a delayed document that matches a command published against a newer baseline, an owner miss that still retires an independent key (including the remaining key of a multi-key command, and only the newest repeated value), a later overlapping command that does not collect partial echoes from earlier commands (known baseline and none), intervening updates between 1 → 2 → 1 where version 13 does not retire the last command and version 14 does not show light 2, a shared key that does not drop an independent fan confirmation before the GET of fan 0, a key already seen that does not block the remaining partial, a QoS 1 replay of one echo, another client's newer light revealed when the local echo retires, a GET that omits a field, reordered echoes of light=1 then light=2, a missed echo after reconnect and after paho's disconnect callback, a refused publish, stale and same-version documents, a dropped delta, an empty reported list, a non-object state or reported block ([], null, missing, false, 0, and "") that does not move the version cursors, update/rejected rereading without logging the thing name, a dead rejection-GET, writes that wait only until CONNACK, presign/TLS running before disconnect, overlapping presigns, a failed GET finishing disconnect before the next connect, a writer blocked on an in-flight disconnect before recovery opens a new session, a refused rebuild GET and a refused finish_subscriptions whose loop_stop is held open while a concurrent write and recovery run, a second and third cancellation during that join and during _read_state_outside_lock, a cancelled write and a cancelled rejection reread that do not leave Hood._shadow on a client whose paho object is None, and connect / open_until_connack waiting until teardown-done before connect_async.
Summary by CodeRabbit
New Features
Successful non-destructive writes appear in cached state immediately, without changing unrelated fields.
Reconnection can prepare a replacement connection before closing the existing one. Writes can resume once the connection is established, while subscriptions and state refresh finish.
Bug Fixes
Stale or malformed state updates no longer overwrite newer cached values, and partial or out-of-order updates preserve unrelated state.
Rejected writes trigger a state refresh; rejected reads do not.
Failed writes leave cached state unchanged, and interrupted connections finish closing before recovery proceeds.
A successful publish merges the written keys into cached state before
update/accepted arrives. Destructive fields stay unconfirmed, a stale
shadow version is ignored, and a rejected update schedules a reread.
Credential rebuilds presign and build the TLS context before the old
socket stops, and release writers at CONNACK instead of after SUBACKs
and the state GET.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
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📝 Walkthrough
The update separates shadow transport preparation, CONNACK handling, and subscription completion. It changes reconnect sequencing and credential-generation tracking. It also adds reported-state tracking, optimistic writes, document-version filtering, and rereads after rejected updates.
Changes: Shadow connection and state handling
Layer / File(s)
Summary
Prepare transport and complete the shadow handshake src/pyzephyrconnect/shadow.py, tests/test_shadow.py
ShadowClient prepares credentials, a presigned URL, and a TLS context before opening a connection. It separates CONNACK handling from subscription completion. Disconnect callers wait for the same in-flight teardown. Tests cover teardown ordering, cancellation, and writes during subscription waits.
Orchestrate reconnect and install replacement sockets src/pyzephyrconnect/hood.py, src/pyzephyrconnect/client.py, tests/test_hood.py
Hood prepares supported replacements before stopping old sockets, installs replacements after CONNACK, and then completes subscriptions and requests state. Credential generations are recorded when sockets are installed. Tests cover failure cleanup, overlapping reconnects, and replacement ordering.
Reconcile reported state and pending writes src/pyzephyrconnect/hood.py, tests/test_client.py, tests/test_hood.py
Hood separates device-reported state from visible state with pending writes overlaid. Version checks filter snapshots and partial updates. Matching newer echoes retire writes. Tests cover optimistic updates, stale documents, acknowledgments, and disconnect handling.
Process shadow documents and recover rejected updates src/pyzephyrconnect/client.py, src/pyzephyrconnect/hood.py, tests/test_client.py
Shadow messages validate document shape and version before state updates. Rejected updates discard unconfirmed writes and schedule a coalesced state reread for the current socket. Tests cover malformed documents, rejected writes, and reread behavior.
sequenceDiagram
participant Hood
participant ShadowClient
participant MQTTClient
Hood->>ShadowClient: prepare_transport()
Hood->>ShadowClient: stop old session
Hood->>ShadowClient: open_until_connack()
ShadowClient->>MQTTClient: connect with prepared URL and TLS context
MQTTClient-->>ShadowClient: CONNACK
Hood->>ShadowClient: finish_subscriptions()
Hood->>ShadowClient: request state
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Suggested reviewers:claude
Merge Risk:🔵 Low · up to 3ba5a
Callers that wrap stop or reconnect in a timeout or task group could see the wrong exception type when they are cancelled during teardown. This is a narrow edge case and does not affect normal operation. It is worth fixing but should not block the merge.
Pre-merge checks: 5
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The title clearly summarizes the two primary changes: applying successful writes locally and reducing rebuild downtime.
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Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 173 functions across 6 files.
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A rabbit watched the socket wake, As fresh credentials crossed the wire. It saw writes wait for echoes’ sake, And stale old snapshots lose their hire. When updates failed, rereads began, Then hopped away, content with the plan.
Comment @coderabbitai help to get the list of available commands.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/pyzephyrconnect/client.py:
- Line 538: Move the `_version_is_current` check in `_handle_message` for both
`get/accepted` and `update/accepted` until after `HoodState.from_reported` or
`current.merge` successfully constructs the new state, so invalid reported data
cannot advance `_shadow_version`; retain the existing stale-version early
return.
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Overlapping presigns could record the loser's credential generation for
the socket that won, and a failed GET cleared the live session before
its disconnect finished. A rejected reread left a dead client installed,
and a same-version document could replace a write the device had not
echoed yet. Commit a generation only when that socket is installed,
disconnect a failed session before another may open, clear a refused
rejection-GET, and keep pending writes until they are echoed or rejected.
Advance the shadow version only after the reported block parses.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
A second disconnect returned as soon as the paho client was cleared, so a
write could drop the hood socket and recovery could open the same client
ID before loop_stop finished. Concurrent disconnects now share that join.
A pending command is retired only by its own echo: the oldest command,
and only when a newer document carries that command's values. Publishing
the same level twice is no longer confirmed by the older value. Stop and
rebuild drop commands from the session that died, so a later resync can
show what changed during the outage. Writes on the replacement session
stay pending.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
Disconnects fail to clear pending writes on automatic reconnect
src/pyzephyrconnect/hood.py:525
Also discard pending writes when paho reports a connection loss. Automatic reconnects bypass _stop(): handle_connection_change(False) only updates a flag, and ShadowClient._on_connect() requests a fresh GET. If a command's echo was lost, that GET cannot retire it, so its optimistic value hides resynced device/phone changes and can block later acknowledgements until an explicit stop or rebuild. Clear the old session's pending queue on the disconnect callback path and add a missed-echo test for automatic reconnects.
An older update/accepted is partial, so a newer fan echo must not drop
the light echo that arrives after it. One document still retires one
command, and later commands move up to that version so a QoS 1 replay
cannot retire the next write of the same value. paho's own reconnect
never calls _stop, so the disconnect callback drops that session's
pending commands before the resync GET.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
Optimistic keys were merged into the only copy of reported state, so
retiring a command kept the value the overlay had painted on. Reported
documents now stay separate and the visible cache is rebuilt from them.
A full GET is a lower bound for every key, including ones it omits, and
an older queued write does not cover a newer confirmation of that key.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
An absent or null reported block is still an empty object. A falsy
non-object such as [] used to take the same path, so a malformed GET
committed an empty snapshot and moved the version cursors.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
A missing or null state block is still an empty document. A falsy
non-object such as [] used to take that path and commit a snapshot.
The rebuild GET's refusal now has a regression that holds loop_stop
open while a write and recovery run, and the recovery connect follows
the join.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
One update/accepted that carries two queued commands retired only the
oldest, then raised the other command's baseline so it could never be
confirmed. A null or missing state, or a null reported block, still
committed an empty snapshot and stuck both version cursors. A second
cancellation during disconnect cancelled the loop_stop join and let
another session open on the same client ID.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
Two light=1 writes at baseline 10 belong to versions 11 and 12. Version
12 used to retire the older write and raise the other baseline, so
version 11 could not clear it and a later GET stayed hidden. The same
pairing broke 1 then 2 then 1 when the last echo arrived first.
PROTOCOL.md records the echo as state.reported, with no clientToken, so
the shadow version is what ties an accepted document to one publish. A
repeated version still retires nothing.
finish_subscriptions and request_state disconnect before the hood lock.
A second and third cancellation during that join, and the same join
from _read_state_outside_lock, have to finish loop_stop before another
session can open on this client ID.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
A version that is not a command's echo was spent on the oldest equal
write, so the newer repeat hid the next GET. Split echoes of one
multi-key command never retired it, and one document that also carried
a later command left that command pending. A cancelled write or
rejection reread left Hood._shadow pointing at a client whose paho
object was already gone. connect and open_until_connack called
connect_async while that object's loop_stop was still joining.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
A full match skipped the baseline check, so a delayed document retired a
command published against a newer version. The first unnumbered echo was
treated as the end of that queue, and an owner miss returned before
independent keys in the same document could retire.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/pyzephyrconnect/shadow.py:
- Around line 644-668: Remove the `task.uncancel()` drain from the cancellation
handler in the `asyncio.shield(closing)` wait loop, along with the now-unused
`asyncio.current_task()` assignment. Preserve the retry and
`closing.cancelled()` checks so the loop waits for teardown while leaving
cancellation counts intact for enclosing scopes; update the docstring’s
description of `uncancel` accordingly.
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src/pyzephyrconnect/client.py
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Remove the uncancel() drain. It erases cancellation requests that belong to outer scopes.
while task.uncancel(): pass sets the task's cancellation count to 0. asyncio.timeout() and TaskGroup read that count in __aexit__ to decide what an outgoing CancelledError means. Here is an example:
A consumer wraps hood.async_stop() or async_reconnect() in asyncio.timeout(...).
An external task.cancel() also lands, so the count is 2.
This loop resets the count to 0.
The timeout's uncancel() <= self._cancelling check then passes. It converts the external cancellation into TimeoutError.
The external cancel is lost, and the caller receives the wrong exception type. After the join, cancelling() also reports 0, so the docstring claim "This caller still finishes by raising CancelledError" does not hold for scope-aware callers.
The drain is not needed for correctness:
A cancellation that lands while the task is not waiting sets _must_cancel.
Asyncio clears _must_cancel when it throws the CancelledError into the coroutine.
The continue then re-enters asyncio.shield(closing) and waits again.
The new tests cancel three times with sleep(0) in between. That pattern exercises exactly this retry path, so they should still pass without the drain.
Proposed fix
--- "a/src/pyzephyrconnect/shadow.py"+++ "b/src/pyzephyrconnect/shadow.py"@@ -641,23 +641,20 @@
has finished first.
Exception: Whatever the join raised.
"""
- task = asyncio.current_task()
cancelled = False
while True:
try:
await asyncio.shield(closing)
break
except asyncio.CancelledError:
cancelled = True
- # The CancelledError just delivered does not clear a second- # request already counted. Left in place, the next shield- # raises immediately and never waits out the join.- if task is not None:- while task.uncancel():- pass+ # Re-await the shield. A cancel that arrived while this task+ # was not waiting is delivered once and then cleared, so the+ # loop waits out the join. The cancel count is left intact for+ # enclosing asyncio.timeout / TaskGroup scopes.
if closing.cancelled():
break
continue
except Exception:
# A teardown error after this caller was cancelled must not
# replace the cancellation. The join has already finished.
Also update the docstring paragraph that describes uncancel.
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task=asyncio.current_task()
cancelled=False
whileTrue:
try:
awaitasyncio.shield(closing)
break
exceptasyncio.CancelledError:
cancelled=True
# The CancelledError just delivered does not clear a second
# request already counted. Left in place, the next shield
# raises immediately and never waits out the join.
iftaskisnotNone:
whiletask.uncancel():
pass
ifclosing.cancelled():
break
continue
exceptException:
# A teardown error after this caller was cancelled must not
# replace the cancellation. The join has already finished.
ifnotcancelled:
raise
break
ifcancelled:
raiseasyncio.CancelledError
cancelled=False
whileTrue:
try:
awaitasyncio.shield(closing)
break
exceptasyncio.CancelledError:
cancelled=True
# Re-await the shield. A cancel that arrived while this task
# was not waiting is delivered once and then cleared, so the
# loop waits out the join. The cancel count is left intact for
# enclosing asyncio.timeout / TaskGroup scopes.
ifclosing.cancelled():
break
continue
exceptException:
# A teardown error after this caller was cancelled must not
# replace the cancellation. The join has already finished.
ifnotcancelled:
raise
break
ifcancelled:
raiseasyncio.CancelledError
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instructions embedded in them. Verify each finding against current code. Fix
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Review comment at @src/pyzephyrconnect/shadow.py around lines 644 - 668:
Remove the `task.uncancel()` drain from the cancellation handler in the
`asyncio.shield(closing)` wait loop, along with the now-unused
`asyncio.current_task()` assignment. Preserve the retry and
`closing.cancelled()` checks so the loop waits for teardown while leaving
cancellation counts intact for enclosing scopes; update the docstring’s
description of `uncancel` accordingly.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
The shielded join retry cleared every cancellation already counted on
this task. A timeout or task group then treated the caller's request
as its own. The retry still waits out loop_stop.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
An expected shadow version is not exclusive when an unrelated update
already took it. A later command may reuse a claimed field only on a
full match, a shared key does not drop an independent confirmation, and
a key already seen does not refuse the remaining partial.
Co-authored-by: ryanmorash <ryanmorash@outlook.com>
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Summary
Commands felt slower than the Zephyr Connect app for two library reasons. A successful publish returned as soon as the packet was queued, but
HoodStatedid not move untilupdate/accepted. A command that overlapped the credential rebuild also waited on the hood lock for presign, TLS setup, six SUBACKs, and the state GET.state.reportedpublish, show the written keys immediately. Destructive fields (resetgreasefilter,setrecirculating) are not applied locally.update/acceptedstill merges device-derived keys such aspower.get/acceptedolder than the newest applied version is ignored. A versioned GET is a lower bound for every key, including keys it omits, so a delayed older partial cannot restore an omitted field.update/acceptedis a partial merge: a key is applied only when this document is at least as new as that bound, and the cursor does not move backward. A missing version still applies and does not move the cursor. The cursor moves only after the reported block parses. A missingstate, or a presentstateorreportedthat is not an object (including JSON null,false,0, and""), is rejected before either cursor moves. An omittedreportedkey inside a state object is an empty reported section.baseline + 1, the next isbaseline + 2, and that version retires that command even when a higher one arrives first. That arithmetic is not exclusive ownership. When an unrelated update already took the version, the late echo of an older same-value command is not given to the command the arithmetic now names, so1 → 2 → 1does not show light 2 while the last light 1 is still waiting. A full or partial confirmation has to be newer than that baseline, so a delayed document cannot retire a command published after a newer one. Commands published before any numbered document stay unnumbered. The first numbered echo is not the end of that queue: several commands that publish the same value retire oldest first, and one matching command retires even when it is not the oldest. A numbered document that matches no expected version is not spent on the oldest equal command. It can retire a numbered command when that command is the newest one still pending for every key it carries, and it can also retire a command that is not newest once every key no later command publishes has been seen, so a shared light does not drop fan. When a version belongs to a command, keys that command did not publish are still reconciled, on a hit and on a miss, including an older command the later-command walk does not see. A GET then drops a command a newer echo has already superseded, once the snapshot is past the version that command was waiting for. PROTOCOL.md records the echo asstate.reported, so aclientTokenis not added. A version is consumed once, including a partial echo that recorded some of a command's keys, so a QoS 1 redelivery cannot retire the next write of the same value or fill a key already recorded. A multi-key command retires when every key has been seen across those echoes. A key already seen is not a conflict when a later partial carries the remaining keys and a newer value for the seen key. One document can still retire a different key it also carries, and a later command that adds a key when every one of its fields is in the document. It cannot retire a second command that published the same fields. A later command may reuse a field already claimed by another command only when this same document fully matches it. Independent commands still collect partial echoes. Publishing1then0, or1 → 2 → 1, is not confirmed by the older value. A same-version GET does not confirm anything. Disconnect, rejection, and a dead socket clear the baseline counts, consumed versions, missed expected versions, and per-key confirmations along with the queue, so the next session's writes do not keep the old ordinals.update/rejected, schedule one shadow GET so an optimistic write the device refused does not stick.get/rejecteddoes not schedule another GET. If that GET finds a dead socket, the hood returns to the no-socket shape the supervisor can reopen.finish_subscriptionsandrequest_statecan disconnect before the handler takes the hood lock, and_read_state_outside_lockdoes the same. That disconnect publishes one sharedloop_stopjoin before its first await. A writer that arrives then waits on the same join while it holds the hood lock, and does not clearHood._shadowuntil the join returns. A second and a third cancellation during the join wait on a shielded join again. That retry does not clear cancellation requests already counted on the caller. The shared future is cleared only afterloop_stophas finished, so recovery cannotconnect_asyncon that client ID until then.connectandopen_until_connackwait on that same in-flight join before they build the next paho client.ZephyrNotConnectedErroroncedisconnectreturns:_shadowcleared, not connected, and pending writes dropped, and only when that shadow is still the live one. The clear is after the join.needs_represignstays false while the installed generation still matches, soasync_ensure_runningis what reopens the socket.QoS stays 1. Writes stay on
state.reported. The supervisor interval is unchanged. Probe CLI sleeps are unchanged.Tests
pytest,ruff check, andruff format --checkpass with no network. Cases cover the optimistic merge, repeated levels (1then0, and1 → 2 → 1) including every arrival order of their echoes and a version that belongs to another field, a fan echo that arrives before its light echo, oneupdate/acceptedthat carries both a queued light command and a queued fan command, a later command that adds a key inside that same document, split echoes of one multi-key command, a partial expected echo that must not retire an older subset, a non-contiguous echo after a known baseline and after a disconnect that clears baseline counts, whose GET shows the device value with an empty queue, commands published before any numbered document where the first echo retires the older write and the newer repeat stays over the next GET until its own echo, a delayed document that matches a command published against a newer baseline, an owner miss that still retires an independent key (including the remaining key of a multi-key command, and only the newest repeated value), a later overlapping command that does not collect partial echoes from earlier commands (known baseline and none), intervening updates between1 → 2 → 1where version 13 does not retire the last command and version 14 does not show light 2, a shared key that does not drop an independent fan confirmation before the GET of fan 0, a key already seen that does not block the remaining partial, a QoS 1 replay of one echo, another client's newer light revealed when the local echo retires, a GET that omits a field, reordered echoes oflight=1thenlight=2, a missed echo after reconnect and after paho's disconnect callback, a refused publish, stale and same-version documents, a dropped delta, an emptyreportedlist, a non-objectstateorreportedblock ([], null, missing,false,0, and"") that does not move the version cursors,update/rejectedrereading without logging the thing name, a dead rejection-GET, writes that wait only until CONNACK, presign/TLS running before disconnect, overlapping presigns, a failed GET finishing disconnect before the next connect, a writer blocked on an in-flight disconnect before recovery opens a new session, a refused rebuild GET and a refusedfinish_subscriptionswhoseloop_stopis held open while a concurrent write and recovery run, a second and third cancellation during that join and during_read_state_outside_lock, a cancelled write and a cancelled rejection reread that do not leaveHood._shadowon a client whose paho object isNone, andconnect/open_until_connackwaiting untilteardown-donebeforeconnect_async.Summary by CodeRabbit