Lopy nano gateway transmits data via UART

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Hi all!
I'm studying at the university, and i try to make a project: i have few sensors, which send data to the LoPy via LoRa, and then i try to send these data to my smartphone via UART. I found a good example for making gateway and nodes (https://github.com/pycom/pycom-libraries/tree/master/examples/lorawan-nano-gateway), but in this example the gateway transmits data to the things network via wifi. Can you please help me where, and what should I modify?
Thank you for your help!