For testing purposes i am using SIM900A GSM/GPRS module and FTDI UART converter.
SIM900A module is connected to PC via FTDI converter. I use putty as a terminal program to communicate with the module. With required baud rates i am able to communicate with the module by sending a simple AT command (AT command set will vary with different modules) just sending AT the module replies with OK. This means module responded to the command sent from PC. Lets go ahead with TCP AT commands to establish a TCP connection to remote server via GPRS connection.
I have run socket test software on remote PC and opened port 7777. You have to check your firewall or router settings to allow your preferred port. While the software start listening to port 7777, lets continue with the sending AT commands to module from the PC connected to module.
After power up the module please wait for a while to give time to connect to GSM network from module and after few seconds lets proceed with TCP.
I have send these few commands manually from the PC which the module is connected.
AT+CSTT="APN of pixelatedpic"
AT+CIPSTART="TCP","remote pc/server IP ","your preferred port"
your data to send and hit ENTER
Here is the data sent between module and sever via GPRS internet. The data transmission of both directions is successful. Next is try to send the AT commands from Arduino instead of doing manually.
I love to see more comments from the viewers.
stay tune for part 2.