Topic seems OK.
Is your broker really “MQTT” ? Not mosquitto or mqtt ? Check your mqtt.cfg
Group is (per), OK
You are Formatierung with ‘f’ floating point The result is formatted as a decimal number, but the input seems to be INT(decimal) not Float “6686” maybe this is the problem.
I thought mqtt is mosquitto. And my broker name is MQTT.
In fact it is only this item / topic which is not working and same warning in the openhab.log.
Also tried it with “%d” as integer without success.
Number MCU2_SYS_VOLT_db “MCU2 SYS Volt [%d mV]” (per) {mqtt="<[MQTT:MCU2/SYS/Volt:state:default]"}
Number MCU2_SYS_Runtime_db “MCU2 SYS Runtime [%d ms]” (per) {mqtt="<[MQTT:MCU2/SYS/Runtime:state:default]"}
Event.log:
grep VOLT /var/log/openhab/events.log
2017-08-14 09:03:19 - MCU2_SYS_VOLT_db state updated to 2790.0000
2017-08-14 09:08:48 - MCU2_SYS_VOLT_db state updated to 2788.0000