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Bluetooth LE for Secure Remote Control
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GJS123:
Hi All,

I would like to make a replacement secure RF "key fob" type remote control for an exisiting intruder alarm system.  This needs a few functions e.g. arm, disarm, part arm, open garage door etc.  Interfacing to the exisiting alarm is no problem.

I had an idea to use two Bluetooth LE equipped MCUs e.g. ESP32.  I am thingking that once the pairing has taken place, the encrypted data flow between the two MCUs should be pretty secure.  I believe that the two devices can be "bonded" which means that no "in the clear" communication takes place as the pairing information is a one time thing only.

Does this sound feasible?  Or are there securty flaws in my cunning plan?

Thanks for any advice.
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