I can't get the above modules (with Core Gray unit) to communicate with each other. They are not supported in M5Flow yet, the example given for arduino doesn't work no matter what I do.

Has anyone managed to get this to work and would share any advice?

Is it possible to create a simple ZigBee gateway (for some zigbee sockets and light bulbs) with this type of module, or is it only usable for "tunneling" a UART port via ZigBee?

Thanks everyone!