Based on a custom Miio package (https://github.com/kingkong123/miio)

npm install node-red-contrib-mi-air-purifier3

Trigger the node with these payload

Turn On/Off

On: {"control":"power","value":true}

Off: {"control":"power","value":false}

Change Mode

Auto: {"control":"mode","value":"auto"}

Sleep: {"control":"mode","value":"sleep"}

Favorite: {"control":"mode","value":"favorite"}

None: {"control":"mode","value":"none"}

Fan Speed

{"control":"fan","value":1}

{"control":"fan","value":2}

{"control":"fan","value":3}

Buzzer

On: {"control":"buzzer","value":true}

Off: {"control":"buzzer","value":false}

Child Lock

On: {"control":"childLock","value":true}

Off: {"control":"childLock","value":false}

LED Brightness

Bright: {"control":"ledBrightness","value":"bright"}

Dim: {"control":"ledBrightness","value":"dim"}

Off: {"control":"ledBrightness","value":"off"}