Command queries for location working, but startVehicle command fails

[lzthqx]

error: Command error {"command":"startVehicle","err":{"request":{"authRequired":true,"body":"{}"

It appears as though the command is being sent correctly, and I can retrieve status for odometer, tpms etc, but cannot send commands. 2021 Chevy BOLT EV, Canadian OnSTAR account.

[tylerpieper]

I'm having the same issue. The Onstar2MQTT container seems to crash when receiving the startVehicle command.

[tylerpieper]

Actually, I've spent some time with this and sorted it out.

I saw the following error in the log:

undefined:1
{'command': 'startVehicle'}
 ^

SyntaxError: Unexpected token ' in JSON at position 1
    at JSON.parse (<anonymous>)
    at MqttClient.<anonymous> (/app/src/index.js:79:41)
    at MqttClient.emit (node:events:513:28)
    at MqttClient._handlePublish (/app/node_modules/mqtt/lib/client.js:1547:12)
    at MqttClient._handlePacket (/app/node_modules/mqtt/lib/client.js:535:12)
    at work (/app/node_modules/mqtt/lib/client.js:438:12)
    at writable._write (/app/node_modules/mqtt/lib/client.js:452:5)
    at doWrite (/app/node_modules/readable-stream/lib/_stream_writable.js:409:139)
    at writeOrBuffer (/app/node_modules/readable-stream/lib/_stream_writable.js:398:5)
    at Writable.write (/app/node_modules/readable-stream/lib/_stream_writable.js:307:11)

It turns out that Home Assistant's script GUI does undesired things to the MQTT commands needed for this container. If you use the GUI, your YAML will look like this:

alias: Bolt EV - Charge Override
sequence:
  - service: mqtt.publish
    data:
      topic: homeassistant/VIN/command
      payload: "{\"command\": \"cancelChargeOverride\"}"
mode: single
icon: mdi:battery-charging

Onstar2MQTT does not like payload data that HA reformats it to as above. It should look like this:
payload: '{"command": "cancelChargeOverride"}'
Note the single quotes surrounding the payload, and no escape characters before the double quotes. I recommend setting up any settings you'd like in the GUI, then switch to YAML mode, fix the payload, then save. This fixed all the scripts for me.

[lzthqx]

This was the solution for me. Good catch! Thanks for this!