I also have the ST-903.
Haven't got it connecting to traccar yet - still working on it.
If anyone else has had success connecting please share.
I will post up if I get anywhere
I can confirm the ST-903 works.
My issue was, although I had set port 5013 on my router to port forward to my traccar server, it wasn't staying open.
Had to change the port, for the H02 protocol, to a port which did, actually stay open.
This is on a crappy VirginMedia Super Hub 3.
Hello people, have You ever test correctly sinotrack st 903 device? I want to know if it's compatible with traccar. Thanks in advance