Sinotrack ST-903

Sinotrack ST-903 is a small GPS tracker suitable for motorbikes, vehicles, etc. The device features movement, speeding, leaving or entering areas, low battery, shocking alerts, built-in 1050 mAh backup battery, voice monitor, geofencing, and more.

Protocol: sinotrack Manufacturer: Auto Leaders Forum discussion
Custom command
Send custom command to device without waiting for response, Scheme: "*,,#". You have to specify payload only
payload: Payload string
Mileage query command S32