Rak7249 configure external mqtt

I have a lzdw260 vibration sensor, which is automatically connected to rak7249. The rak7249 device is new. How to set the mqtt to publish the data to the external

See the last few screen shots on this page:

https://doc.rakwireless.com/rak7249-macro-outdoor-gateway/lora-network

which allows you to setup the format of the topics

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