Hello, We are using EC200T module over USB with our MCU. We are able to establish PPP connection and perform data exchange with our servers successfully. However, at few locations we observe that although the PPP connection is working okay as per the MCU PPP stack, we find that data transfer is stopped. When we disconnect and reconnect PPP, data is again through and after a while the same condition repeats.
We are using usbmodem port for the PPP, and while monitoring the module via usbat port, we find that whenever this happens the usbat port receives the following notifications-
+QIND: SMS DONE
+QIND: PB DONE
We suspect that the modem’s PPP connection gets reset or some other condition happens which causes the PPP to stop working.
Our observation is also that if the data volume is high (600~1kbytes), then the frequency of this happening is more.
What could be the cause of this behaviour and how to resolve this?