Hi Fernando,
We managed to solve our problem with a work-around. It is not possible to associate one gateway to the other gateway thru the Lora cards. So we have following setup:
- Gateway 1 receives messages from nodes, processes data with Node-red.
- On USB Host of GW1 we put mDot on micro dev kit, in COMMAND mode
- We send processed payload in Node red to Serial out flow, with a flag/index according to EUI of respective node, combined with AT+SEND command.
- On GW2 the mDot is associated as a node
- GW2 receives frame from GW1 thru the mDot, we further process/unpack with node-red to get our actual payload and feed it further to the PLC.
Both GWs are in NS mode. For some reason we could not get the mDot to do the job in Serial mode, but serial comm is a pain by itself. It is a bit of a trouble until you find out on which port the mDot appears, in our case it was on XRUSB04.
Good luck.
Boyko