Can I use b-l072z-lrwan1 to implement a l'ora gateway?

[ang0001]

I would use a b-l072z-lrwan1 to implement a lora gateway using ping pong example and send data to PC through serial, receiving data from serial and send response to other nodes that are still b-l072z-lrwan1

[Tesla DeLorean]

Not as a Gateway in the LoRaWAN sense, but you could modify the Ping Pong example into a LoRaP2P point-to-point type implementation as a serial radio.

[ang0001]

I have multiple nodes. When a node communicate with gateway it should send with UART data to PC and it have to receive data to send back to former node. Is this feasible?

[Tesla DeLorean]

The Semtech SX1276 facilitates access to the radio medium in a half-duplex fashion. All nodes will hear the same transmitted traffic. So implementing a one-to-one and one-to-many shouldn't be unduly hard.

[ang0001]

The problem is this enter in stop mode. How can disable it?

And uart interrupt doesn't work even if I block program preventing to go in stop mode

[Tesla DeLorean]

Right, you're going to need to refactor the while() loop in main(), keeping the radio active, in receive mode to listen for in-bound traffic.

Probably going to need to look at how the debug UART is managed via VCOM and the PRINTF functionality.

The B-L072Z-LRWAN1 has several possible UART's, you'll need to watch the pin usage, and solder-bridges as they relate to the Arduino header and ST-LINK VCP.

I might suggest decomposing the Ping-Pong example into two versions, a Listener and a Sender