It's gsm_signal, not gsm_sign  &&  storing 'time' and 'battery' as int

The input field was too small to read it all.
I found this by running a POST dumper instead of this software:
http://georgik.sinusgear.com/2011/01/07/how-to-dump-post-request-with-python/
(I converted it to Python3 with 2to3-3.4.)

By doing so, I also found out that the time and battery values
are also sent as integers.