====== MQTT Schema ======

  * /FLKA
      * /system
        * /labswitch - the big lab switch at the entrance
          * /stat
            * type: boolean
            * description: labswitch status
            * values: 'ON' or  'OFF'
          * /poll - messages here trigger the switch to resend it's state
      * /Steckdosen
        * /LeisteXX - replace XX with respective number
          * /DoseXX - replace XX with respective number
            * /stat
              * /power
                * type: boolean
                * description: status of the power of the socket.sent after the socket was toggled
                * values: 'ON' or 'OFF'
            * /cmd
              * /power
                * type: boolean
                * description: command channel to toggle the socket
                * values: 'ON' or 'OFF'
            * /tele
              * /amp
                * type: number
                * description: power consumption level
                * values: 0-255
      * /Heizung
        * /ThermostatXX - replace XX with respective number
      * /Sensor
        * /MAC: Unique ID
          * /stat
            * /temperature
            * /humidity
      * /labtivators
        * /discover
          * type: string
          * description: payload contains the mac of the newly connected labtivator
        * /<mac>
          * /stat
            * /button1color
              * type: string
              * description: change the LED color of the button
              * values: 'red', 'green', 'black'/any
            * /button2color
              * type: string
              * values: 'red', 'green', 'black'/any
              * description: change the LED color of the button
          * /cmd
            * /button1
            * /button2