I am using MC9S12XDP512 micro conroller as a application host.Using this through serial port i send GPRS ACTIVATION AT commands to the Q24PLUS chip set .I have to send bulk of data through this using TCP/IP.I do not have much idea about this .Please help me in , how to use AT commands for this? ,how do i call a server? and how should i frame my data packet?
Is it essential that you use an external microcontroller?