ZoH unable to connect to other node after restarting z2m

[bitcoin1192]

I ran into issue today, where ZoH unable to talk to other node after i restart z2m. Before restarting, i apply changes on tx power and confirm that it still able to control node in the network (control and network join). only after restarting from z2m restart button then ZoH unable to control other node. ZoH still receive update data from other node tho, not sure why this happen now even though i have restart z2m container multiple time even changing rcp devices and it was working fine

[Nerivec]

What errors are you seeing? Did you try reverting the tx power back to what it was before?

[Nerivec]

Might be an expiry problem if the network is down for a while. I'll double-check 😅
Could be some kind of corruption of the zoh.save too though I guess. If you can reproduce this reliably, see if you can inspect the save before/after, to spot differences.

[chris-1243]

Let's stop for a while ZoH and see what will be the output.

Edit: I waited more than 30mins, the network is fine. I did not lose any devices.

[bitcoin1192]

so restarting it from z2m restart button reset zoh.save to 88 bytes, compared to stopping container via docker where zoh.save has 1.1kbytes stored in it. some logs

[2026-06-06 12:29:42] debug: ot-rcp-driver:parser: <<< FRAME[7e8006713300418833346ffffff7b10802fdff00001ca4285da33f00e1d2a4feff843c0000aeff942c18394bfe42f7daf1d9c46359018b1092b48000000a00144419aeddb80000000001000005000000000000320a7e]
[2026-06-06 12:29:42] debug: ot-rcp-driver: <--- SPINEL[tid=0 cmdId=6 len=80]
[2026-06-06 12:29:42] debug: ot-rcp-driver: <--- SPINEL STREAM_RAW METADATA[rssi=-76 noiseFloor=-128 flags=0]
[2026-06-06 12:29:42] debug: frame-handler: <-~- NWK Ignoring frame from coordinator (broadcast loopback)
[2026-06-06 12:29:42] info: stack-context: Disallowed joins
[2026-06-06 12:29:42] info: nwk-gp-handler: Exited Green Power commissioning mode
[2026-06-06 12:29:42] debug: zh:zoh: ~~~> [ZDO to=0xffffffffffffffff:65532 clusterId=54 disableResponse=true]
[2026-06-06 12:29:42] debug: ot-rcp-driver: ===> ZDO[seqNum=27 clusterId=54 nwkDst=65532:undefined]
[2026-06-06 12:29:42] debug: aps-handler: ===> APS DATA[seqNum=(41/165/165) macDst16=65535 nwkDst=65532:undefined nwkDiscRte=0 apsDlv=2]
[2026-06-06 12:29:42] debug: mac-handler: ===> MAC[seqNum=165 dst=65535:undefined]
[2026-06-06 12:29:42] debug: ot-rcp-driver: ---> SPINEL[tid=4 cmdId=3 len=67 wait=true timeout=10000]
[2026-06-06 12:29:42] debug: ot-rcp-driver:writer: >>> FRAME[7e84037130004188a5346fffff00000802fcff00001da528e46b02005a6f486f6e5a324d00a1b4f6a62f6052e808523944746622600314010401010001000000000000000014ee1f7e]
[2026-06-06 12:29:42] debug: ot-rcp-driver:parser: <<< FRAME[7e8406000000010000008000000a0000000000000000000000010000050000000000006cb07e]
[2026-06-06 12:29:42] debug: ot-rcp-driver: <--- SPINEL[tid=4 cmdId=6 len=32]
[2026-06-06 12:29:42] debug: zh:controller:database: Writing database to '/app/data/database.db'
[2026-06-06 12:29:42] info: ot-rcp-driver: ======== Driver stopping ========
[2026-06-06 12:29:42] info: nwk-gp-handler: Exited Green Power commissioning mode
[2026-06-06 12:29:42] info: stack-context: Disallowed joins
[2026-06-06 12:29:42] debug: ot-rcp-driver: ---> SPINEL[tid=5 cmdId=3 len=2 wait=true timeout=10000]
[2026-06-06 12:29:42] debug: ot-rcp-driver:writer: >>> FRAME[7e85032000b0737e]
[2026-06-06 12:29:42] debug: ot-rcp-driver:parser: <<< FRAME[7e8006712d0061889e346f00007add480200007add1e262819a223006200af077538c1a4006d8dc5dfbd25e4ff081f051d2804cc8010000a0014a475e8ddb800000000010000050000000000008f297e]
[2026-06-06 12:29:42] debug: ot-rcp-driver: <--- SPINEL[tid=0 cmdId=6 len=74]
[2026-06-06 12:29:42] debug: ot-rcp-driver:parser: <<< FRAME[7e850620000d4a7e]
[2026-06-06 12:29:42] debug: ot-rcp-driver: <--- SPINEL[tid=5 cmdId=6 len=2]
[2026-06-06 12:29:42] debug: ot-rcp-driver: ---> SPINEL[tid=6 cmdId=3 len=2 wait=true timeout=10000]
[2026-06-06 12:29:42] debug: ot-rcp-driver:writer: >>> FRAME[7e86033700e48e7e]
[2026-06-06 12:29:42] debug: ot-rcp-driver:parser: <<< FRAME[7e8606370059b77e]
[2026-06-06 12:29:42] debug: ot-rcp-driver: <--- SPINEL[tid=6 cmdId=6 len=2]
[2026-06-06 12:29:42] debug: stack-context: Saved state to /app/data/zoh.save (1188 bytes)
[2026-06-06 12:29:42] info: ot-rcp-driver: ======== Driver stopped ========
[2026-06-06 12:29:42] info: z2m: Stopped zigbee-herdsman
[2026-06-06 12:29:42] info: z2m: Stopped Zigbee2MQTT
Starting Zigbee2MQTT without watchdog.
[2026-06-06 12:29:42] debug: z2m: Removing old log directory '/app/data/log/2026-06-04.20-15-04'
[2026-06-06 12:29:42] info: z2m: Logging to console, file (filename: log.log)
[2026-06-06 12:29:42] info: z2m: External JS (converters/extensions) is disabled
[2026-06-06 12:29:42] debug: z2m: Loaded state from file /app/data/state.json
[2026-06-06 12:29:42] info: z2m: Starting Zigbee2MQTT version 2.10.1-dev (commit #0618aca73a91d33542e483e646297fa96886e3a2
)
[2026-06-06 12:29:42] info: z2m: Starting zigbee-herdsman (10.1.0)
[2026-06-06 12:29:42] debug: z2m: Using zigbee-herdsman with settings: '"{"network":{"panID":28468,"extendedPanID":[194,32,166,214,173,34,254,223],"channelList":[20],"networkKey":"HIDDEN"},"databasePath":"/app/data/database.db","databaseBackupPath":"/app/data/database.db.backup","backupPath":"/app/data/coordinator_backup.json","serialPort":{"baudRate":460800,"rtscts":false,"path":"/dev/ttyTEST0","adapter":"zoh"},"adapter":{"disableLED":false,"transmitPower":8}}"'
[2026-06-06 12:29:42] debug: zh:adapter:discovery: Unable to match USB adapter: zoh | /dev/ttyTEST0
[2026-06-06 12:29:42] info: zh:zoh: Using default stack config.
[2026-06-06 12:29:42] debug: zh:controller: Starting with options '{"network":{"networkKeyDistribute":false,"networkKey":"HIDDEN","extendedPanID":[194,32,166,214,173,34,254,223],"panID":28468,"channelList":[20]},"serialPort":{"baudRate":460800,"rtscts":false,"path":"/dev/ttyTEST0","adapter":"zoh"},"adapter":{"disableLED":false,"transmitPower":8},"databasePath":"/app/data/database.db","databaseBackupPath":"/app/data/database.db.backup","backupPath":"/app/data/coordinator_backup.json"}'
[2026-06-06 12:29:42] info: zh:zoh: RTS/CTS config is off, enabling software flow control.
[2026-06-06 12:29:42] debug: zh:zoh: Opening serial port with [path=/dev/ttyTEST0 baudRate=460800 rtscts=false]
[2026-06-06 12:29:42] info: ot-rcp-driver: ======== Driver stopping ========
[2026-06-06 12:29:42] info: nwk-gp-handler: Exited Green Power commissioning mode
[2026-06-06 12:29:42] info: stack-context: Disallowed joins
[2026-06-06 12:29:42] debug: stack-context: Saved state to /app/data/zoh.save (88 bytes)
[2026-06-06 12:29:42] info: ot-rcp-driver: ======== Driver stopped ========
[2026-06-06 12:29:42] error: z2m: Error while starting zigbee-herdsman
[2026-06-06 12:29:42] error: z2m: Failed to start zigbee-herdsman
[2026-06-06 12:29:42] error: z2m: Check https://www.zigbee2mqtt.io/guide/installation/20_zigbee2mqtt-fails-to-start_crashes-runtime.html for possible solutions
[2026-06-06 12:29:42] error: z2m: Exiting...
[2026-06-06 12:29:42] error: z2m: Error: Error Resource temporarily unavailable Cannot lock port

[Nerivec]

That doesn't sound right 😅 Can you send me the two saves? You can find me on Discord if you prefer to share them in DM.

[chris-1243]

I have been able to reproduce the issue. I sent you some zoh.save via Discord

[Nerivec]

Fixed with Z2M >= 2.12.0.