Hi,

i need to track gps location from about 5000 mobile devices (android).
The tracker im using updates every 20 sec. gps coordinates in mysql database by a http post.
That performs a huge server load.
What you have to do is to create a android tracker app that optimizes the server load.

If you need to change transport protocol - installation of jwebsocket / or socket.io is posiible on server side.
If you bid for this project, please post how you plan to solve the problem and which framework you will choose to develope the app (phonegap...)