Control relay with E5 development kit

Hi, I have 2 E5 development kits, and I am new to LoRa. I would like to control a grove relay hooked up to the uart port (or the IIC port), using the AT command set. At first I would like to control the relay with just one of the boards.

Later, I would like to use both boards to transmit using LoRa - one being the receiver (with relay onboard), controlled by the board that is hooked up to my Ubuntu PC via USB (using AT command set).

Lastly, I would like to use the Helium network to wirelessly control the relay.

Is all this possible? Tks, AB