gabonator

var net = require('net');
const zlib = require('zlib');

Ali = 
{
  _decompress: (buffer, handler) => zlib.unzip(buffer, {}, (err, buffer) => err ? handler() : handler(buffer.toString())),
  _alibuffer: (buffer) => "Start" + ("0000000" + buffer.length).substr(-7) + "End" + buffer,
  _alijson: (json) => Ali._alibuffer(JSON.stringify(json)),
  _requestBytes: 0,
  _responseBuffers: [],

gabonator

/*
 reverse engineering of ABcom Cryptobox 600HD mini dvbs box protocol
 
 Firstly I examined android package (since it was easier to get it) "g-mscreen-2-3-11.apk". It
 uses C++ library for implementing control protocol. Then I was trying to capture UPnP communication
 from iphone connected to OSX running wireshark. But without luck. GMScreen allowed to connection
 to box using ip address and port. This traffic was easier to caputre and analyse. Requests by
 client application are human readable json/xml code. Some response packets are compressed using
 zlib.