BSTPL sentences announce themselves with a BSTPL$ prefix. Traccar’s decoder on TCP 5241 then reads battery/firmware/ICCID/power paths and, on richer profiles, boxOpen, RPM, CAN odometer, fuel, gear, engine temperature, and coolant temperature.
Prefix is the fingerprint
If the raw line does not start with BSTPL$, you are not on this dialect — stop forcing 5241.
Engine fields vs IoTM doors
IoTM emphasises door corners and trailer id. BSTPL emphasises box-open and powertrain-ish readings. Keep the troubleshooting ladders separate.