with android it's for the camera.
on ubuntu touch, it does nothing.
it's already ask in gitlab.
I think it's because i didnt use lzo data compression. i switch sever that support lzo data conpression and it's work now.
it can also be the protocol. because, in the firts place my server was tcp and now its udp.
i hope. for me it's close, but i hope i can help someone else