Matter Commissioning Failure - Android App sends empty CountryCode

[plastikrab]

When commissioning a Matter device via Matterbridge on Android, the Google Home app sends an empty string for the mandatory "countryCode" field. This causes a "Validation-Error 0x87" because the Matter spec requires at least 2 characters. The device then rejects the connection with "ConstraintError 135".

This appears to be a bug in the Google Home Android app's implementation of the setRegulatoryConfig command.

Error logs (simplified):

• Cluster: GeneralCommissioning (0x30)

• Command: setRegulatoryConfig (0x02)

• Error: Validation-Error 0x87

• Detail: String "" is too short: 0, min 2 in field countryCode

• Status: ConstraintError (135)

• Result: Failsafe timer expired / Session ended

Environment:

• Controller: Nest Mini

• Mobile App: Google Home (Android)

• Bridge: Matterbridge / Home Assistant

[arm_dpe · Accepted solution]

Thanks for reporting this. Could you please open an issue tracker here(matter template) and share the same details above. I will forward it to internal teams for further investigation.