I have successfully been talking to a 3G usb modem using CDC interface. Problem is after I configure all the settings and APN and then do a dial up and establish an IP session, the port then becomes a data interface. After which I can see all the data transmission and reception etc..
But what if I want to use AT commands while data mode is still active? like say I want to querry the RSSI values etc using AT comands. How do I switch from PPP/data session to AT commands?
I have read about +++, but it doesnt do anything for me... :|