LoRa keys

To be able to connect and send data over a LoRaWAN network, you need a set of keys.

DevAddress comparable to a phone number. It contains the network operator address, which specifies the operator to contact and identifies the device so the network operator knows where the data is coming from.
Network Session Key a hash value, used to encrypt the entire data packet (at the network layer level) being sent over the wire. Together with the DevAddress, it is used to uniquely identify a device. This hash value makes certain that no one can steal the data packet while being transmitted over the air.
Application Session Key a hash value, used to encrypt the data part of the data packet (your sensor data). This is a secondary protection layer which protects the data sent to the service provider infrastructure.

All three values are supplied to the modem when communication is initiatied.

You can download your LoRa Keys from AllThingsTalk Maker.

Go to your LoRa™ device page
Enter the device settings > setup tab
Open the settings tab where you can copy your LoRa keys or download a keys.h file suitable for use in your client code on your device.

Alternative you might find the DevAddr, NWSKey and APPSKey in your LoRaWAN Service Provider portal.

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