* no more ByteBuffer, but a fixed size byte array that gets flushed everytime it's needed
* log of activity data to a separate file (no DB integration yet)
* the size of the buffer must be a multiple of 3 (1 minute of data = 3 bytes) and 20 (the normal size of the chunks we get from the device)
* better logging and more comments in code
Daniele Gobbetti