There could be many possible reasons why your server doesn't receive/accept data from device:
- there is no GPRS connection
- there is no records to send
- your server doesn't accept records (due to wrong protocol for example)
First check if your device has some records saved in internal memory that should be send to server. Please send getinfo SMS command to device. When you receive an answer there will be REC:X part which shows how many records is in the memory. Full answer description is described on our Wiki page:
If Rec number is non zero it means that device is generating records but they could not be send.
To check GPRS status connect your device to Configurator and go to Status->GSM Info, you will see there GPRS status, SIM state, Sent Records counter and more.
Please verify above and let me know about your situation
Janusz / Teltonika support