I have a G120 and I am using an arduino shield from seeedstudio which contains a Sim900 chip I am using to communicate with a hand built server.
The SeeedStudio Shield
I am using a slightly modified version of the TCP Cellular Radio Manager from codeplex
To connect to the TCP socket server the command is
The issue is that even though I am connecting to my server on 443, I can’t get it to start tls. I have looked through the manual for AT commands in starting TLS on a TCP connection, but it doesn’t seem to mention it anywhere. I know that there is an SSL / TLS Stack included in the G120 for networking, but I am unsure how to utilize this when the tcp connection is being established on the sim900 which is connected to the G120 through a serial connection.
I am not 100% sold on the Sim900. The overall picture is that I need to come up with a method of connecting my G120 to a server through a GPRS connection. Does anyone have any experience in this kind of connection?