I’ve been working with the Arch GPRS board and the associated mbed GPRS library (which apparently I’m not allowed to link to…).
However, I’ve been confused by the fact that the library uses AT commands (e.g. CSTT, CIPSTART and CIPSEND which are not documented in either of the AT command references listed on the wiki (e.g. here or here).
It seems like these undocumented commands present an interface similar to, for example, the SIM900 interface but other commands from the SIM900 are not implemented (e.g. CIFSR).
Are these undocumented commands, um, documented somewhere? How did you know you could use them? And how can I retrieve the device’s IP address?