Filtering of MQTT message

Flows
2

You can use Homeyscript for that:

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The mqttcaller script extracts the caller and puts it in a tag:

const payload = JSON.parse(args[0]);
setTagValue('caller', { type: 'string', title : 'caller' }, payload.caller);
return true;

(for some reason, the tag title isn’t show in the Action card, just its green placeholder)