Works well and at lower power
For Sigfox Castellated Breakout Board
Evidently after sending 2 messages one needs to send AT reset commands or the 3rd message will not be on a proper frequency for SigFox to receive. Some known flaw with the chip.
Send command: "AT$GI?" without quotes, you should get 2 numbers, let us call it "x,y" (x being the first number, y is the 2nd)
Send "AT$RC" to reset in software if x==0 OR y<3
Or send "AT$RC" before each message to simplify the logic.
Really painful to register and setup in SigFox, their website user interface and chosen terminology is very awkward but works, yet it is bizarre.
PS: Default speed of UART on the board is 9600.
