COLLISION_BEACON When sending downlink to Class A device

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I was sending downlinks to a Class A device. Sometimes I get errors "COLLISION_BEACON".

My gateway is a RAK7289
Chirpstack version is v4.14.1
In my device profile Class B & C are disabled.

The error is described as "Rejected because there was already a beacon planned in requested timeframe." But why would this conflict? This is only relevant for Class B devices, right?

1 Answers

Even if your devices do not use Class-B, the gateways might still send Class-B beacons (which are sent every 128 seconds). If you would like to avoid COLLISION_BEACON errors, you should turn off the sending of Class-B beacons in your gateway configuration.