Tzachi2

Hi,

Please review the following pr.
It allows one to start working with the wifi receivers.
Currently we are only checking this, obviously we can add more checks, like values and so on.

Please note that the way time is used by the wixel readers is that when capturing a packet from dexcom, they set the time (their local time). Before sending the packet, they look at their local clock again and calculate the relative time and send it over the wire. So Dexdrip gets accurate time no metter if there is a clock differance.

So, in any case, I'll also add a check based on txid.