Use the Mqtt Explorer to take a look into the Broker data. So you know the topic (the path) and how the data is stored. In most cases, the values are directly stored in a topic. Then it’s easy to import into a Homey device. Sometimes values are stored as JSON. Then you have to adapt device settings and add a conversion to read a value from the JSON.
You can read along the app thread and ask there if you have questions. Please try Mqtt Explorer first to have a base we can help.
