It’s possible to use Jame’s approach without the Rule. See MQTT 2.5 M1+ How to implement the equivalent to MQTT1 REGEX filters. It works by chaining a REGEX filter that looks for the string you care about (e.g. “0x7DB8”) and only if it’s present does the message get passed to the JSONPATH transform. Then you can create multiple channels for each device that get updated from the same MQTT topic and even from the same MQTT messages.
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