Unable to connect via serial

[hanjo]

Hi,

I'm trying to connect to my T-Beam Supreme via the serial interface using meshcore-cli.

Unfortunately, this does not work:

# meshcli -s /dev/ttyTBEAM -b 115200 -D
DEBUG:meshcore:port opened
INFO:meshcore:Serial Connection started
DEBUG:meshcore:Connected successfully: /dev/ttyTBEAM
DEBUG:meshcore:Sending appstart command
DEBUG:meshcore:Sending raw data: bytearray(b'\x01\x03      mccli')
DEBUG:meshcore:sending pkt : b'<\r\x00\x01\x03      mccli'
DEBUG:meshcore:Waiting for events [<EventType.SELF_INFO: 'self_info'>], timeout=5.0
DEBUG:meshcore:Dispatching event: EventType.CONNECTED, {'connection_info': '/dev/ttyTBEAM'}, {}
DEBUG:meshcore:Sending device query command
DEBUG:meshcore:Sending raw data: 1603
DEBUG:meshcore:sending pkt : b'<\x02\x00\x16\x03'
DEBUG:meshcore:Waiting for events [<EventType.DEVICE_INFO: 'device_info'>, <EventType.ERROR: 'command_error'>], timeout=5.0
ERROR:meshcore:Error while querying device: Event(type=<EventType.ERROR: 'command_error'>, payload={'reason': 'no_event_received'}, attributes={})

I am using the experimental firmware from here, which adds the observer functionality into the repeater firmware. This could obviously be the source of the issue, but maybe it is still worth exploring this, because when I try to access the serial console directly, it works fine:

# screen /dev/ttyTBEAM 115200
ver
  -> 1.11.0-letsmesh.net-dev-2025-12-22-7015b6c (Build: 22-Dec-2025)

Also the serial console at https://config.meshcore.dev/ works fine.

Any idea what could be the issue?