What about HM-11 board? Iam using B6,B7 for TX,RX. But do I need the system key to solder (HM11 pin 16) with A8? (http://www.elecrow.com/download/bluetooth40_en.pdf)
Edit:I tried with A8 but It seems I cant connect to the bluetooth module. When I try to connect to tty.Bluetooth-Incoming-Port, I cant write any command :/
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