The Semtech UDP Packet Forwarder is the original LoRaWAN® packet forwarder, connecting to servers through the Semtech UDP protocol. Many gateways include a pre-compiled version of the Semtech UDP Packet Forwarder, often adapted to the specific gateway.
Warning: The Semtech UDP Packet Forwarder has many security and scalability drawbacks. Use LoRa Basics™ Station to connect your gateway to The Things Stack.