Supporting multiple US_915 sub bands (V4)

Daryl · October 28, 2023, 6:17pm

I would like to be able to support multiple US_915 sub bands with a single Chirpstack server. Do I need to run multiple instances of CS Gateway bridge on the host where CS is running? Is there documentation on doing so? We are not able to run CS Gateway Bridge on the gateways. Thanks.

brocaar · November 3, 2023, 2:56pm

Yes, you can see for example:

github.com

chirpstack/chirpstack/blob/master/chirpstack/configuration/chirpstack.toml#L79


      
              "au915_0",
              "cn470_10",
              "cn779",
              "eu433",
              "eu868",
              "in865",
              "ism2400",
              "kr920",
              "ru864",
              "us915_0",
              "us915_1",
            ]
          
          
          # API interface configuration.
          [api]
          
            # interface:port to bind the API interface to.
            bind="0.0.0.0:8080"
          
            # Secret.

Note that each region configuration should have its own MQTT topic prefix. In this setup, a single gateway should only work under a single region configuration. E.g.

[gw 1] -- UDP port 1700 --> [ ChirpStack Gateway Bridge ] -- us915_0/gateway/... --> [ MQTT broker ]

[gw 2] -- UDP port 1701 --> [ ChirpStack Gateway Bridge ] -- us915_1/gateway/... --> [ MQTT broker ]

Nicolas_Figueroa · September 30, 2025, 9:05am

I need some help understanding this.

I have a Dragino LPS8v2 and I’m hosting the Lora Network Server and the Application Server in it. When I launch the LNS in the Dragino web interface it asks me what sub band Im planning to use, then in the chirpstack I can only create device profiles with that sub band.

Now when im only using that gateway to listen to lora devices its not an issue, because it can only listen to 8 channels, so I match them, its all good, but now I have a second gateway, and Im forwarding the packets to the LNS hosted on the first one.

So here is wher it gets tricky for me, lets say I set GW_1 to listen to sub band 2, channels 8 to 15, and GW_2 to listen to sub band 3, channels 16 to 23, and I configure half my end devices to transmit on sub band 2 and the other half on sub band 3, because you know I have too many end devices for just one sub band

My question is those devices talking to GW_2, even if GW_2 is able to hear then and forward the packets to GW_1, will their data be able to enter the LNS? or only devices transmitting on the sub band my LNS is set to will be able to get their data into the LNS?

Is this limitation comming from the fact that Im running the LNS in the gateway itself? or are LNS hosted in the cloud limited too in this way?

Please help