[Bug] characteristic was supplied illegal value (DIYRuZ_Flower)
conveys the value incorrectly 

DIYRuZ DIYRuZ_Flower
https://z2m.dev/devices/diyruz/diyruz_flower.html

log plugin [7/14/2021, 1:06:18 PM] [homebridge-z2m] This plugin generated a warning from the characteristic 'Current Temperature': characteristic was supplied illegal value: null! Home App will reject null for Apple defined characteristics. See https://git.io/JtMGR for more info

everything is updated to the latest version
