Anti-afk minecraft

Help, i dont know how to stay afk in my server without being kicked off, my server has a restriction of 10min afk, but i can go through it with a anti-afk bot or pressing space and f11, and my char keep jumping. But here is the problem, after 15min there is another afk check and it kick me out with the message: you have been idle for too long!

Any suggestions? the server is 1.7.2

If you come back again and read this
Find a place with water and put anti-afk