I have a project idea which involves a lot of steps. It is a workaround. I have tried to host a website on the arduino through a gsm shield but it seems like I have hit a wall with that. So for now here is the work around.
There are two units, A and B. A and B are both mobile and could be two feet away from each other at times and could also be hundreds of miles apart from each other. They must be able to communicate with each other in a second or less. I know how to do it through sms but that takes way too long. The only thing I can think of is by using the gsm shield. Each unit will have an arduino with a gsm shield and a sim card on the same network (example: at&t). They will then be able to communicate with each other, make requests, wait for requests, nearly instantly. These will be extremely short messages. The only thing they will be doing is telling each other "hey, I need you to set pin 5 high". Then later on it might ask "Is pin 5 high" and it will receive a reply "yes". Now obviously this is english translation of the computers communicating with each other but I am getting my point across no?
Anyways, I just need a push in the right direction for the code that will allow these to machines to talk to each other through the network (not voice or sms but data because it is faster).