B4R Question fireBeetle and bluno beetle communication

Hi Guys,
How could I make the firebeetle to communicate to the beetle through BLE.
I explain my project.

I would like to run a beetle over lipo battery as a door lock(dead bolt) then have a firebeetle connected on a wall wart somewhere near and ready communicate with it.

The communication could come from both side.
if the door is lock/unlock (with a key) then the beetle will send a message to the firebeetle and if the signal come from my mqtt(over the wifi of the firebeetle) then the firebeetle will send the signal to the beetle and lock or unlock the door.


Thanks for your help

Yannick