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Join server

ChirpStack supports the activation of devices through an external Join Server, using the API as specified in the LoRaWAN Backend Interfaces specification. In this case the session-keys will not be derived by ChirpStack and there is no need to configure the AppKey (and NwkKey in case of a LoRaWAN 1.1 device).

Routing a join-request to a Join Server is based on the JoinEUI which is part of the LoRaWAN join-request. If ChirpStack finds a server matching the JoinEUI, then it will forward the join-request to this server. In any other case, ChirpStack will handle the join-request.

Configuration

Semtech LoRa Cloud Join Server

To configure the Semtech LoRa Cloud Join Server with ChirpStack obtain the TLS certificates that you must use from the LoRa Cloud web-interface.

  • Under Your network servers click Add Server
  • Then click download credentials

Within the obtained credentials archive you will find three files that you need to configure within the ChirpStack configuration:

  • .trust: must be configured as ca_cert
  • .crt: must be configured as tls_cert
  • .key: must be configured as tls_key

Note: While the web-interface indicates that https://js.loracloud.com:7009 is the LoRa Cloud Join Server, this is not the endpoint that must be configured as server within the ChirpStack configuration. The correct endpoint is https://js.loracloud.com:7009/api/v1/rens/rens-XYZ/lbi. You have to replace rens-XYZ with the actual Rens ID, you will find this value in the LoRa Cloud web-interface.

Example configuration:

[[join_server.servers]]
join_eui="0016c001fffe0001"
server="https://js.loracloud.com:7009/api/v1/rens/rens-123/lbi"
ca_cert="/etc/chirpstack-network-server/certs/acct.trust"
tls_cert="/etc/chirpstack-network-server/certs/acct.crt"
tls_key="/etc/chirpstack-network-server/certs/acct.key"