Loaded all software No controller recogn

Hi. Loaded Buster on Pi3… Kegbot…Kegberry…Docker…Docker compose… still does not recognise controller…

Arduino Mega 2560 worked ok with Stretch and Kegbot etc.

With new setup. the RX led flashes… TX does not.

Serial monitor only shows jibberish…

Any ideas please?

Is the Mega picked up by the OS (Buster)?
#ll /dev/ttyACM0

How did you connect to the serial monitor? Directly via Buster ie:
#screen /dev/ttyACM0

When you start the composer what do you get in the first few lines of the log? this is mine picking up the controller:

[email protected]:~/kegberry# docker-compose logs -f
Attaching to kegberry_pycore_1, kegberry_workers_1, kegberry_kegbot_1, kegberry_kegboard_1, 
kegberry_mysql_1, kegberry_redis_1
kegboard_1  | 2021-01-18 09:00:25,624 INFO     (kegnet) Connecting to redis at redis://redis:6379/0 
kegboard_1  | 2021-01-18 09:00:25,628 INFO     (main) Main loop starting.
kegboard_1  | 2021-01-18 09:00:25,629 INFO     (main) Device added: /dev/ttyACM0
kegboard_1  | 2021-01-18 09:00:27,053 INFO     (main) unknown device: <HelloMessage: 
firmware_version=18 protocol_version=None serial_number= uptime_millis=0 uptime_days=0>
kegboard_1  | 2021-01-18 09:00:27,053 INFO     (main) Device <Kegboard path=/dev/ttyACM0 
speed=115200> is named: kegboard