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.