I'm programming mobile phones in J2ME, and I am in need of communicating with a server, which can be programmed via PHP. Additionally it has a mySQL database.
It should work like that:
1. A mobile phone connects to the server via Internet.
2. It receives an id, which clearly identifies the mobile phone. So the mobile phone is logged in, as long as the application is not closed.
3. Now picture a series of mobile phones which are all connected to the server at the same time using the same procedure.
4. Now I want to address each mobile phone according to its id.
For instance, one mobile phone has the ID 20090416/23456. Another one has the ID 20090416/23457. Now the approach should be - here in pseudo-code - "look through all IDs being connected, find a pattern and display a message/picture on that screen". So the first mobile phone could show a picture, the second mobile phone could show a text.
I would like to know, which specific information I need to accomplish this.