Very small app on Android

Receive and show (and enable scrolling of) a pdf doc, scan customer's signature and send it back (with or without the pdf, we don't care). Communication over TCP (you’re the TCP client) to a linux server. Push is not usable, it’s running locally, we don’t have internet. Kiosk mode, always in the AC socket. Simple protocol on TCP already done, runnig on a public linux server. Time is an issue, we need it until july 6, end of this weekend would be brilliant. Money is not an object. If you are interested, here’s the protocol: Command packets are 100 bytes each, including only text (filled with spaces). Commands are: hello, ping, file (from us to you), signature (from you to us). Examples: hello 100 1465484654.256475 (100 is version of your program, the big number is actual time on the device) ping 1465484655.256475 (you have to send it every sec, otherwise the server disconnects you) file 286 2147871 (286 is a transaction ID, you have to send it back with the signature. 2147871 is len of file, exact number of bytes in the following packet (so this one doesn’t have 100 bytes). Same goes for signature packet. Right now the testing server sends a pdf 2 seconds after you connect to it, just to test it. The peer for you to connect to is [login to view URL]:6800. If you cannot connect, I guess the server program died :) It’s a first try, not tested. Howgh :)