Failed to sync time manuSpecificTuya.mcuSyncTime

[u15jtau]

What happened?

I'm experiencing frequent time sync issues in Zigbee2MQTT when using the SLZB-MR4 (EFR32MG26) adapter with firmware version 20240602. These messages appear in the Zigbee2MQTT log continuously to the point I'm getting multiple per second.

Environment
Zigbee2MQTT version: 2.6.1
Node.js version: 18.20.8
npm version: 10.8.2
OS: Ubuntu 24.04.3 LTS (noble)
Running in: Proxmox VM (Ubuntu guest)
MQTT broker: [insert broker name/version]
Zigbee adapter: SLZB-MR4
Chipset: EFR32MG26
Adapter firmware: 20240602
Adapter type (Z2M config): ember

Coordinator Info
Coordinator type: ember
Firmware version: 20240602
Network state: Running
Zigbee2MQTT DB: Clean/fresh install (no previous devices or database)
Adapter connected via ethernet.

Zigbee Network
Total devices: 59
Repeater devices: 50+
Signal strength (LQI): Most devices have LQI ≥ 120
Network health: Stable, no routing issues, no pairing loss
Given the high repeater count and strong LQI across the network, this appears not to be caused by network instability or interference.

Problem Behavior
Time sync errors appear in logs every few minutes
No device dropouts or visible loss of communication
No pairing loss
Issue started immediately on clean install
Survives reboots, adapter reconnects, and restarts

zhc:tuya: Failed to sync time with '0xa4c138ad92360951' (Error: ZCL command 0xa4c138ad92360951/1 manuSpecificTuya.mcuSyncTime({"payloadSize":8,"payload":[48,75,178,196,48,76,63,100]}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed (Delivery failed for '36257'.))

What I’ve Tried
Clean install of Ubuntu 24.04.3 LTS
Clean install of Zigbee2MQTT 2.6.1
Flashed latest firmware (20240602) to SLZB-MR4
Downgraded Node.js from v22 to v18 LTS
Reinstalled dependencies via npm ci
Enabled debug logging
Restarted Zigbee2MQTT and VM

Let me know what else you need and I'd be happy to provide the relevant information.

The main device I have is https://www.zigbee2mqtt.io/devices/ZMS-206US-4.html#zemismart-zms-206us-4

What did you expect to happen?

I expect that the message is not shown and the time is synced.

How to reproduce it (minimal and precise)

This started from the moment I added the first device.

Zigbee2MQTT version

2.6.1

Adapter firmware version

20240602

Adapter

SLZB-MR4

Setup

Intel NUC with proxmox on an unbuntu server.

Device database.db entry

{"id":16,"type":"Router","ieeeAddr":"0xa4c138e18df4b70e","nwkAddr":32042,"manufId":4417,"manufName":"_TZE204_wwaeqnrf","powerSource":"Mains (single phase)","modelId":"TS0601","epList":[1,242],"endpoints":{"1":{"profId":260,"epId":1,"devId":81,"inClusterList":[4,5,61184,0],"outClusterList":[25,10],"clusters":{"genBasic":{"attributes":{"65503":"K0iK0iK0iK0iK0i�K0i�K0i�K0i","65506":56,"65508":0,"65534":0,"modelId":"TS0601","manufacturerName":"_TZE204_wwaeqnrf","powerSource":1,"zclVersion":3,"dateCode":"","appVersion":74}}},"binds":[],"configuredReportings":[],"meta":{}},"242":{"profId":41440,"epId":242,"devId":97,"inClusterList":[],"outClusterList":[33],"clusters":{},"binds":[],"configuredReportings":[],"meta":{}}},"appVersion":74,"dateCode":"","zclVersion":3,"interviewCompleted":true,"interviewState":"SUCCESSFUL","meta":{"configured":332242049},"lastSeen":1756951491547}

Debug log

No response

[Koenkk]

Could you provide the debug log of this?

See this on how to enable debug logging.

[enigmaspb]

Same spam error in log - device Moes BHT-002

[2025-09-05 02:24:27] error: zhc:tuya: Failed to sync time with '0xb0c7defffec56b9f' (Error: ZCL command 0xb0c7defffec56b9f/1 manuSpecificTuya.mcuSyncTime({"payloadSize":8,"payload":[104,186,31,54,104,186,73,102]}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed (Timeout - 9736 - 1 - 11 - 61184 - 11 after 10000ms))

[Koenkk]

Please provide the complete debug log (I need more than just the error)

See this on how to enable debug logging.

[elalitarek]

Have the same error, consumed 35 gigs free space and that's how i notifed it :

[2025-09-05 22:36:57] debug: zh:ember: ~~~> [ZCL to=0xa4c1385a2f02a562:51430 apsFrame={"profileId":260,"clusterId":61184,"sourceEndpoint":1,"destinationEndpoint":1,"options":4416,"groupId":0,"sequence":0} header={"frameControl":{"reservedBits":0,"frameType":1,"direction":0,"disableDefaultResponse":false,"manufacturerSpecific":false},"transactionSequenceNumber":240,"commandIdentifier":36}]

[2025-09-05 22:36:57] debug: zh:ember:ezsp: ===> [FRAME: ID=52:"SEND_UNICAST" Seq=179 Len=34]

[2025-09-05 22:36:57] debug: zh:ember:uart:ash: ---> FRAME type=DATA frmTx=3 frmRx=5

[2025-09-05 22:36:57] debug: zh:controller:endpoint: Error: ZCL command 0xa4c1385a2f02a562/1 manuSpecificTuya.mcuSyncTime({"payloadSize":8,"payload":[48,78,6,92,48,78,34,124]}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed ({"target":51430,"apsFrame":{"profileId":260,"clusterId":61184,"sourceEndpoint":1,"destinationEndpoint":1,"options":4416,"groupId":0,"sequence":185},"zclSequence":239,"commandIdentifier":11} timed out after 10000ms)

at Object.start (/app/node_modules/.pnpm/zigbee-herdsman@6.0.4/node_modules/zigbee-herdsman/src/adapter/ember/adapter/oneWaitress.ts:196:23)

at EmberOneWaitress.startWaitingFor (/app/node_modules/.pnpm/zigbee-herdsman@6.0.4/node_modules/zigbee-herdsman/src/adapter/ember/adapter/oneWaitress.ts:220:50)

at /app/node_modules/.pnpm/zigbee-herdsman@6.0.4/node_modules/zigbee-herdsman/src/adapter/ember/adapter/emberAdapter.ts:2035:55

at processTicksAndRejections (node:internal/process/task_queues:105:5)

at runNextTicks (node:internal/process/task_queues:69:3)

at processImmediate (node:internal/timers:453:9)

at Queue.execute (/app/node_modules/.pnpm/zigbee-herdsman@6.0.4/node_modules/zigbee-herdsman/src/utils/queue.ts:36:20)

at EmberAdapter.sendZclFrameToEndpoint (/app/node_modules/.pnpm/zigbee-herdsman@6.0.4/node_modules/zigbee-herdsman/src/adapter/ember/adapter/emberAdapter.ts:1971:16)

at Request.send (/app/node_modules/.pnpm/zigbee-herdsman@6.0.4/node_modules/zigbee-herdsman/src/controller/helpers/request.ts:86:25)

at Endpoint.sendRequest (/app/node_modules/.pnpm/zigbee-herdsman@6.0.4/node_modules/zigbee-herdsman/src/controller/model/endpoint.ts:358:20)

[2025-09-05 22:36:57] error: zhc:tuya: Failed to sync time with '0xa4c1385a2f02a562' (Error: ZCL command 0xa4c1385a2f02a562/1 manuSpecificTuya.mcuSyncTime({"payloadSize":8,"payload":[48,78,6,92,48,78,34,124]}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed ({"target":51430,"apsFrame":{"profileId":260,"clusterId":61184,"sourceEndpoint":1,"destinationEndpoint":1,"options":4416,"groupId":0,"sequence":185},"zclSequence":239,"commandIdentifier":11} timed out after 10000ms))

[u15jtau]

Hi
Log file attached.

log.log

[Koenkk]

Fixed it!

Changes will be available in the dev branch in a few hours from now and in the next release which is every 1st of the month.

[JNow01]

Hi,
Still getting mcuSyncTime errors this morning with the latest dev release for these devices :

[2025-09-07 10:08:42] error: zhc:tuya: Failed to sync time with '0xa4c1382913b655dd' (Error: ZCL command 0xa4c1382913b655dd/1 manuSpecificTuya.mcuSyncTime({"payloadSize":8,"payload":[104,189,61,129,104,189,89,161]}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed ({"target":54031,"apsFrame":{"profileId":260,"clusterId":61184,"sourceEndpoint":1,"destinationEndpoint":1,"options":4416,"groupId":0,"sequence":104},"zclSequence":150,"commandIdentifier":11} timed out after 10000ms)) [2025-09-07 10:08:55] error: zhc:tuya: Failed to sync time with '0xa4c138b442aa4702' (Error: ZCL command 0xa4c138b442aa4702/1 manuSpecificTuya.mcuSyncTime({"payloadSize":8,"payload":[104,189,61,141,104,189,89,173]}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed ({"target":33556,"apsFrame":{"profileId":260,"clusterId":61184,"sourceEndpoint":1,"destinationEndpoint":1,"options":4416,"groupId":0,"sequence":143},"zclSequence":155,"commandIdentifier":11} timed out after 10000ms)) [2025-09-07 10:08:57] error: zhc:tuya: Failed to sync time with '0xa4c138b7789bcd97' (Error: ZCL command 0xa4c138b7789bcd97/1 manuSpecificTuya.mcuSyncTime({"payloadSize":8,"payload":[104,189,61,143,104,189,89,175]}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed ({"target":9956,"apsFrame":{"profileId":260,"clusterId":61184,"sourceEndpoint":1,"destinationEndpoint":1,"options":4416,"groupId":0,"sequence":162},"zclSequence":157,"commandIdentifier":11} timed out after 10000ms))

Perhaps they were not targeted by the fix ?
Have a nice day !

[Koenkk]

@JNow01

• could you provide the debug log of this?
• I'm afraid I cannot disable the time sync of this device, otherwise the device wouldn't have the time which is required for the schedule.