The unit of measurement %
is not valid together with device class signal_strength
#233
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Update rpi-cpu2mqtt.py for change device class of Wifi Signal to None for Home Assistant.
After change, the sensor is good.
In Home Assistant, the "%" is not recognized as a valid device class, and causes an unavailable sensor. And for the Wifi Signal in %, I did not find a corresponding device class, hence the None.