Serial number could not be determined, skipping publish

[SimonJBurley]

I have a Sofar ME3000 SP, starting sofar2mqtt like this;

docker run -d \
  --name sofar2mqtt \
  -e MQTT_HOST=xxxxxx \
  -e CONFIG_FILE=sofar-me-3000.json \
  -e MQTT_PORT=1883 \
  -e MQTT_USERNAME=xxxxxx \
  -e MQTT_PASSWORD=xxxxxx \
  -e TTY_DEVICE=/dev/ttyUSB0 \
  --rm \
  --device=/dev/ttyUSB0 \
  rpearce/sofar2mqtt-python:latest

results in these logs

$ docker logs -f sofar2mqtt
2025-09-06 18:17:15,499 - INFO - MQTT connecting to broker xxxxxx port 1883 with auth user xxxxxx
2025-09-06 18:17:15,528 - INFO - MQTT Connection Accepted.
2025-09-06 18:17:15,529 - INFO - Subscribing to homeassistant/status
2025-09-06 18:17:18,584 - INFO - Modbus Requests: 19 Retries: 0 (0.0%) Failures: 0 (0.0%)
2025-09-06 18:17:18,584 - ERROR - Serial number could not be determined, skipping publish
2025-09-06 18:17:23,539 - INFO - Modbus Requests: 19 Retries: 0 (0.0%) Failures: 0 (0.0%)
2025-09-06 18:17:28,513 - INFO - Modbus Requests: 19 Retries: 0 (0.0%) Failures: 0 (0.0%)
2025-09-06 18:17:33,468 - INFO - Modbus Requests: 19 Retries: 0 (0.0%) Failures: 0 (0.0%)

Any idea why this might be?

[rjpearce]

Apologies, I may have broken compatibility in the 3.x.x release.

Can you try an older version?

rpearce/sofar2mqtt-python:support-me3000

[SimonJBurley]

Pulled and started rpearce/sofar2mqtt-python:support-me3000

$ docker logs -f sofar2mqtt
2025-09-06 21:16:31,213 - INFO - MQTT connecting to broker xxxxxx port 1883 with auth user xxxxxx
2025-09-06 21:16:31,416 - INFO - MQTT Connection Accepted.
2025-09-06 21:16:31,416 - INFO - Subscribing to homeassistant/status
2025-09-06 21:16:31,416 - INFO - Subscribing to sofar1/rw/standby_mode
2025-09-06 21:16:31,417 - INFO - Subscribing to sofar1/rw/discharge_mode
2025-09-06 21:16:31,417 - INFO - Subscribing to sofar1/rw/charge_mode
2025-09-06 21:16:31,417 - INFO - Subscribing to sofar1/rw/auto_mode
2025-09-06 21:16:36,729 - INFO - Modbus Requests: 27 Retries: 8 (29.63%) Failures: 4 (11.43%)
Traceback (most recent call last):
  File "/opt/sofar2mqtt/sofar2mqtt-v2.py", line 580, in <module>
    main()
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sofar2mqtt/sofar2mqtt-v2.py", line 576, in main
    sofar.main()
  File "/opt/sofar2mqtt/sofar2mqtt-v2.py", line 366, in main
    self.publish_mqtt_discovery()
  File "/opt/sofar2mqtt/sofar2mqtt-v2.py", line 286, in publish_mqtt_discovery
    sn = self.data['serial_number']
         ~~~~~~~~~^^^^^^^^^^^^^^^^^
KeyError: 'serial_number'

Lots of initial retries.

[rjpearce]

Can you try adding the serial_number to the sofar-me-3000.json

Under "registers": [

{
	"name": "serial_number",
	"register": "0x2001",
	"read_type": "string",
	"registers": 7,
        "refresh": 86400
},

You will need to build the container locally..

docker build . -t sofar2mqtt-python:local

[rjpearce]

Quick update on this, I have been working with another user on improving support for the ES.
Read-only is currently working and we are now working on read-write.

#37