Maybe you need to take it stepwise:
- first, please use code fences instead of screen shots: How to use code fences, it will be much easier to read for others
- did you install all bindings, actions and persistences that you need? (either in paperUI or in addons.cfg)
- can you see a value of your
MQTTItemin your sitemap, in other words does it show a value that you expect (if not, your OH2 may not have a connection to your MQTT broker, or your device may not post to MQTT) - you may want to start with a blank rrd4j.cfg, by default all text is commented out, just to exclude that you have trouble with this configuration
- you may want to verify your item definition, there seems to be a extra backslash and the word Number at the end may also be deleted, here just for comparison an item definition from my configuration
Number Livingroom_temp "Temperature in livingroom [%.1f °C]" (gSensors_temp, gSensors) {mqtt="<[MYMQTT:house/sensornode1:state:JSONPATH($.temperature)]"} - it may help to use VSCode: https://docs.openhab.org/configuration/editors.html
- do you see any error codes in your log files? Do you see in your log files that your MQTT service is started and operational?