yes like txt but i will move a slider on 1 phone for Forward, Reverse, Stop etc and send that cmd and tell the phone in different city which has a servo attached by bluetooth (separate issue).
Cmd for Forward could be acsii "forward" or just numeric 1 meaning forward. 5 could be play a sound as you suggest.
"register" one phone sees another phone, that sounds simple enough, simple solution is always preferred. Would you be able to point me to some code, video or tutorial using that method.
in that case why use a phone on the remote end ? get like a netduino board you can get one with a an etherhernet port and have it run the servo
then the phone sends data to the netduino board that operates the servos.
that removes some possible issues like the phone going to sleep, and it means you do not have to have two phones. and the board will allow you to use all kinds of IO and parts and does not need to use Bluetooth to connect to them.
the board calls a wcf service to get commands
the phone calls the service to send commands.
the service acts as a gateway between them and handles the addressing.
no I do not have an example to show you, this can be done but you will need to look for any examples or figure it out.
look here at the coding for fun stuff to see a lot of things like this...