How do I add a custom downlink data topic

Hello, how do I add a custom downlink data topic
Let’s say I want to push downlink data and the topic is iot/#

This is not supported by ChirpStack. To make this work, you probably need to implement a small application which re-publishes the data to the ChirpStack MQTT topic or which would use the (gRPC) API to enqueue the downlink.

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