Setup a LoRa Mote (RN2483) for TTN

@Marten setting writeconfig to zero skips the reset as well. Would you consider adapting the second half of the script to read:

send("sys reset")
time.sleep(1)
if writeconfig is 1:
  send("mac set nwkskey 2B7E151628AED2A6ABF7158809CF4F3C")
  send("mac set appskey 2B7E151628AED2A6ABF7158809CF4F3C")
  send("mac set devaddr "+devaddr)
  send("mac set adr on")
  send("mac save")
  time.sleep(5)

send("mac join abp")

while True:
  ## maybe add cputmp here on a pi
  msg="aa"	
  send("mac tx uncnf 1 "+msg)
  time.sleep(60)

To provide a better example?