openthread_border_router: Bump OTBR to v2026.08.0 (stable) / v2026.09.0 (beta) - #4813
openthread_border_router: Bump OTBR to v2026.08.0 (stable) / v2026.09.0 (beta)#4813agners wants to merge 1 commit into
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….0 (beta) Bump stable to OTBR POSIX 337711e7 (tag v2026.08.0) and beta to fd872ab9 (tag v2026.09.0). For beta, build with OTBR_PLATFORM_RESET_EXIT=ON (ot-br-posix home-assistant#3537) so otbr-agent exits cleanly on a platform reset (e.g. factory reset from the OpenThread Web UI) and is restarted by s6 instead of re-executing itself in place. The in-place re-exec created a fresh OpenThread instance while the s6 service stayed "up", so the runtime configuration applied by the otbr-agent-configure oneshot (TREL, NAT64, upstream DNS, mDNS hostname and enable, TX power) was lost until the add-on was restarted; with OPENTHREAD_CONFIG_MULTICAST_DNS_AUTO_ENABLE_ON_INFRA_IF 0 this left mDNS disabled. A s6-rc oneshot only runs on an s6-rc state transition and is not re-run when s6-supervise restarts a longrun, so move the configuration into the otbr-agent readiness check instead. It now runs for every process instance before the service is reported ready, keeping the start ordering for otbr-web and otbr-agent-rest-discovery unchanged. Note that Home Assistant's "Reset border router" (REST DELETE /node) uses an in-process RcpHost::Reset() and never goes through otPlatReset(), so it is not covered by this change and still loses the runtime configuration on both stable and beta. The beta build also picks up the upstream fix for upstream DNS resolution (openthread/openthread#13545); the workaround from 3.1.2 is kept until stable has it as well. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
📝 WalkthroughWalkthroughThe add-on updates OTBR revisions and version metadata for 3.2.0. The beta build enables platform reset-on-exit. The agent reapplies runtime configuration after restarts. POSIX DNS binding behavior is documented. ChangesOTBR 3.2.0 update
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to After an otbr-agent restart, runtime settings may be only partially restored while the service reports ready. Failure propagation should be fixed before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. (6 skipped: 6 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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`@openthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-agent/data/check`:
- Line 15: Add set -e at the start of otbr-agent-configure.sh so failures from
unguarded ot-ctl commands immediately propagate and prevent readiness from
succeeding after incomplete configuration.
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openthread_border_router/CHANGELOG.mdopenthread_border_router/Dockerfileopenthread_border_router/build.yamlopenthread_border_router/config.yamlopenthread_border_router/openthread-core-ha-config-posix.hopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-agent-configure/dependencies.d/otbr-agentopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-agent-configure/typeopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-agent-configure/upopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-agent-rest-discovery/dependencies.d/otbr-agent-configureopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-agent/data/checkopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-agent/finishopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/otbr-web/dependencies.d/otbr-agent-configureopenthread_border_router/rootfs/etc/s6-overlay/s6-rc.d/user/contents.d/otbr-agent-configure
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FWIW, the I'll have to check how we can make sure the "Border router reset" case reapplies our BR configuration as well. |
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Summary
337711e7(tagv2026.08.0, OpenThreadc7a3a19)fd872ab9(tagv2026.09.0, OpenThread2a8b4a5)-DOTBR_PLATFORM_RESET_EXIT=ON([agent] add option to exit on platform reset openthread/ot-br-posix#3537) sootbr-agentexits cleanly on a platform reset and s6 restarts it, instead of the daemon re-executing itself in placeotbr-agent-configure.sh: TREL, NAT64, upstream DNS, mDNS hostname/enable, TX power) from a s6-rc oneshot into theotbr-agentreadiness check, so it is applied on every start of the process, including supervisor restartsUpstream changes reviewed
Full ranges: ot-br-posix
ec16e396..v2026.08.0(stable) andd83ddc62..v2026.09.0(beta), plus the OpenThread submodule movesc34311f..c7a3a19and6357728..2a8b4a5.Applicable / notable:
python-otbr-apionly consumes/.well-known/threadapi.versionand the dataset/state endpoints, so HA is unaffected.run/finishalready create the egress chain, use-exist/checks and tear everything down; nothing to port.sysctlpath fix (Nginx: Doesn't work with non-default HA port #2125), mDNSResponder fixes (#3394, Failed while querying Serial API capabilities #3230) — not used (we build withOTBR_MDNS=openthread).OPENTHREAD_POSIX_CONFIG_UPSTREAM_DNS_BIND_TO_INFRA_NETIF 0define is kept for stable; the macro still exists in both OT revisions and with the fix it only governs RDNSS-discovered servers.OTBR_PLATFORM_RESET_EXIT(Can't connect MQTT integration with Mosquito Broker #3537) — adopted for beta, see below.Why exit-on-reset, and what it changes
What a "platform reset" is and when it happens
otPlatReset()inotbr-agent(src/agent/realmain.cpp) is invoked by OpenThread'sInstance::Reset()/Instance::FactoryReset(). In our build (D-Bus off, REST + Web UI on), the callers are:otbr/create_network→set_enabled(False)→python-otbr-apifactory_reset()→ RESTDELETE /node→Detach()+otInstanceErasePersistentInfo()+RcpHost::Reset()=otSysDeinit()+Init()in-process → new dataset →set_enabled(True)wpan_service.cppissues a factory reset over the CLI socket, sleeps 4 s, reconnects, thenifconfig up/thread startSettings::Wipe()→otPlatResetthread startOT_RCP_RESTORATION_MAX_COUNT=2, spinel no-response, tty EOF)DieNow()→exit(-1)finishhalts the containerApplication::Run()returns 0In our build (D-Bus off) the OpenThread Web UI Join/Form flow is the only user-facing path that ends in
otPlatReset. Home Assistant's own "Reset border router" never goes through it, and RCP recovery does not either.How upstream handles it today (in-place re-exec)
Without the option,
otPlatReset()doesgApp->Deinit(),longjmp()back intomain(), appends--auto-attach=0to argv andexecvp()s itself (realmain.cpp). The process id and the s6 process slot stay the same:finish, no newrun, the readiness check is not re-run (the new readiness-fd code even explicitly notifies only once andunsetenvsOTBR_NOTIFY_FDfor this reason).trel enable,nat64 enable,dns server upstream enable,mdns localhostname+mdns enable,txpower. OpenThread only persists the dataset, network/parent/child info, SLAAC IID key, SRP keys, BR ULA/on-link prefixes and the Border Agent ID (settings.hpp), none of the above. WithOTBR_FEATURE_FLAGS=ON,RcpHost::Init()only re-applies TREL from the feature-flag default (enable_trel = false), and NAT64/upstream DNS are not touched at all outsideApplyFeatureFlagList()(D-Bus only).OPENTHREAD_CONFIG_MULTICAST_DNS_AUTO_ENABLE_ON_INFRA_IF 0(we set it to control the hostname), mDNS therefore stays disabled after a re-exec until the add-on is restarted: no_meshcop._udp, no SRP advertising proxy. That is the state stable is in today after a Web UI Join/Form.--auto-attach=0implements CLIresetsemantics (stay detached after a reset).Why Android/gtbr uses exit mode
OTBR_ENABLE_PLATFORM_RESET_EXITwas introduced in ot-br-posix #3171 (Dec 2025) for Google border routers: "Some gtbr devices, such as RaspberryPi, the system service will restart the otbr after it exits. They can also rely on the system to implement the platform reset." It was tied toOTBR_ENABLE_PLATFORM_ANDROID; #3537 exposes it as a standalone CMake option so any supervised deployment (systemd, s6) can use it. The rationale is the same as ours: let the supervisor own process lifecycle and observe restarts.With
OTBR_PLATFORM_RESET_EXIT=ONotPlatReset()→gApp->Deinit()→exit(0). s6 runsfinish(tears down the firewall/NAT64 rules, exit 0 so no container halt), respawnsrun(recreates ipsets/chains, runsmigrate_otbr_settings.py, startsotbr-agentunders6-notifyoncheck), and the readiness check runs again.s6-rc oneshots, however, are only executed on an
s6-rc changetransition ("Transitions for oneshot services amount to running the up or down script"); s6-rc's notion of a service being up is just the absence of adownmarker in the live dir, and s6-supervise restarting a longrun is invisible to it. Sootbr-agent-configureas a oneshot would still not run after the restart — the settings would be lost exactly as with the re-exec. This PR therefore foldsotbr-agent-configure.shintootbr-agent/data/check, which s6-notifyoncheck runs for every process instance before it reports readiness. Ordering for dependents is unchanged:otbr-webandotbr-agent-rest-discoverystart onceotbr-agentis ready, which now implies configured.ot-ctlreturns 0 even onErrorresponses (it only fails on connection problems), so configuration errors don't block readiness — same tolerance as the oneshot had.Behavioral differences vs. the re-exec:
--auto-attach=0). After a factory reset there is no dataset, so nothing changes. For a non-wipingotInstanceReset, the BR would re-attach to the saved network instead of staying detached — the same as an add-on restart, which is the right behavior for us.factoryresetbefore reconnecting. A s6 respawn +otbr-agentinit has to fit into that; the re-exec had to re-init everything too, so the added cost is just the process spawn. Worth a smoke test.finishlog line for exit 0 stays neutral, since a clean exit also happens on add-on stop.Pre-existing issue, not addressed here: "Reset border router"
Home Assistant's Reset border router (Thread panel) is implemented as
otbr/create_network, which callspython-otbr-apifactory_reset()→ RESTDELETE /node. OTBR handles that with an in-processRcpHost::Reset():otSysDeinit()+Init()creates a fresh OpenThread instance (Mdns::Corestarts withmIsEnabled(false), and we setOPENTHREAD_CONFIG_MULTICAST_DNS_AUTO_ENABLE_ON_INFRA_IF 0). The onlyRegisterResetHandlerusers are D-Bus, advertising proxy and discovery proxy, all disabled in our build, so nothing re-applies our runtime configuration. HA then pushes the new dataset and enables Thread, but mDNS, TREL, NAT64/upstream DNS and TX power remain at their defaults until the add-on is restarted. Nothing else enables OpenThread's mDNS module: the only callers areotMdnsSetEnabled(ourot-ctl mdns enable) and the auto-enable mode, which we turn off (kDefaultAutoEnable = 0); OTBR itself never calls it. Expected observable symptoms: the_meshcop._udpadvertisement disappears (the BR drops out of the Thread panel's mDNS-discovered router list once the records expire) and the built-in SRP advertising proxy stops publishing Thread devices, e.g. for Matter commissioning/operational discovery.This affects stable and beta alike, and
OTBR_PLATFORM_RESET_EXITdoes not help because the process never exits —DELETE /nodedeliberately avoidsotPlatReset()so it can still return a 200 response. Reproduced on a device; the code path was traced end to end (frontend → core → python-otbr-api → OTBR REST →RcpHost::Reset()).factoryreset→otPlatReset()DELETE /node→RcpHost::Reset()(in-process)RESET_EXIT=ON, this PR)Testing
finishruns, s6 respawns, network forms,ot-ctl mdns state/trel state/txpowershow configured values, HA still sees the BR🤖 Generated with Claude Code
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New Features
Bug Fixes
Documentation