Fan control with shelly MiniPMG3

shelly_fan_control.js

var speed, current_speed 1
var fan_state, current_fan_state = 0
var log = true
var fan_air_in = 2
var fan_air_out = 0
var fan_air_in_and_out = 1
var fan_on = 1
var fan_off = 0
var fan_state_url = "http://example.local/api/entities/livingroom_fan.state/state"
var fan_speed_url = "http://example.local/api/entities/livingroom_fan.speed/state"
var fan_airflow_url = "http://example.local/api/entities/livingroom_fan.airflow/state"

function check_power(msg) {
  if (is_undefined(msg.delta.apower)) { return }
  let apower = msg.delta.apower
  speed, fan_state = 1
  
  if(apower >= 100 && apower < 140) {
    speed = 1
  } else if (apower >= 140) {
    speed = 2
  } else if (apower < 100) {
    fan_state = 0
    speed = 1
  }
 
  if(fan_state != current_fan_state){
    if(fan_state == 1) {
      Shelly.call("HTTP.POST", {url: fan_state_url, body: fan_on})
      Shelly.call("HTTP.POST", {url: fan_airflow_url, body: fan_air_in})
    } else {
      Shelly.call("HTTP.POST", {url: fan_state_url, body: fan_off})
      Shelly.call("HTTP.POST", {url: fan_airflow_url, body: fan_air_in_and_out})
    }
    if(log) print("Fan state", fan_state)
    current_fan_state = fan_state
  }
    
  if(current_speed != speed) {
    Shelly.call("HTTP.POST", {url: fan_speed_url, body: speed})
    if(log) print("Change speed to", speed)
    current_speed = speed
  }
  
  if(log) print(apower);
}

function is_undefined(o) {
  return typeof o == "undefined";
}
Shelly.addStatusHandler(check_power);