baja I have tested this before 
S6, D0 are only working cmds.
if I try  ro send a custom cmd like:
Unlock cable lock  : instruction_type: L5, payload: 3 
I cannot send it and it says in the result:
{
  "timestamp": 1698672711,
  "response": null,
  "id": 1698672701632548,
  "position": 1,
  "name": "custom",
  "device_id": 5362253,
  "executed": false,
  "properties": {
    "instruction_type": "L5",
    "payload": "3"
  },
  "expires": 0
}