title: Save and restore Semtech SX1276 state
body: <p>for technical (safety mainly) reasons, I have to shutdown completely the RF module (sx1276) from time to time for five or less minutes (once or two times per day). Since my LoRaWAN stack is already initialized and my sessions keys still valid after first join, is it possible to simply save all sx1276 registers, shut it down and up, and restore them back to be able to continue doing uplinks without having to reinitialize the whole stack?
  if yes, is there any care to take about the order in which I have to write the registers?</p>
  
  <p>is there any other technical cleaner method to do a simple radio only restart?</p>
  
  <p>Regards</p>