{"NAME":"Arlec 45cm Fan","GPIO":[0,0,0,0,0,0,0,0,0,108,0,107,0],"FLAG":0,"BASE":54}

Backlog TuyaMCU 11,1; TuyaMCU 12,101

Used the following rule to detect speed

Rule1 on TuyaReceived#Data=55AA0307000503040001051B do publish2 stat/afan/speed 3,5 endon
on TuyaReceived#Data=55AA0307000503040001041A do publish2 stat/afan/speed 3,4 endon
on TuyaReceived#Data=55AA03070005030400010319 do publish2 stat/afan/speed 3,3 endon
on TuyaReceived#Data=55AA03070005030400010218 do publish2 stat/afan/speed 3,2 endon
on TuyaReceived#Data=55AA03070005030400010117 do publish2 stat/afan/speed 3,1 endon
on TuyaReceived#Data=55AA03070005030400010016 do publish2 stat/afan/speed 3,0 endon
Rule1 1

Home Assistant fan.yaml

- platform: mqtt
  name: "Arlec Fan"
  state_topic: "stat/afan/POWER1"
  command_topic: "cmnd/afan/POWER1"
  oscillation_state_topic: "stat/afan/POWER2"
  oscillation_command_topic: "cmnd/afan/POWER2"
  speed_state_topic: "stat/afan/speed"
  speed_command_topic: "cmnd/afan/TuyaSend4"
  qos: 0
  payload_on: 'ON'
  payload_off: 'OFF'
  payload_oscillation_on: 'ON'
  payload_oscillation_off: 'OFF'
  payload_low_speed: '3,0'
  payload_medium_speed: '3,2'
  payload_high_speed: '3,5'
  availability_topic: tele/afan/LWT
  payload_available: Online
  payload_not_available: Offline
  speeds:
    - 'off'
    - low
    - medium
    - high

The fan has 6 speed, but this component only lets us set to 3 of them.