Below are the Rules and Settings i use for the unit :

Backlog SetOption66 1; TuyaMCU 11,1; TuyaMCU 12,11; TuyaMCU 13,101; TuyaMCU 15,102; TuyaMCU 1,5; SetOption59 1

Backlog WebButton1 Power; WebButton2 Light; WebButton3 Mist; WebButton4 Light Mode

Rule1 on power3#state=1 do tuyasend4 101,1 endon 
on power3#state=0 do tuyasend4 101,0 endon
on power4#state=0 do tuyasend4 102,0 endon 
on power4#state=1 do tuyasend4 102,1 endon 
on TuyaReceived#data=55AA03070005660400010079 do Backlog publish2 stat/%topic%/EFFECT rgb_cycle; power4 0 endon
on TuyaReceived#data=55AA0307000566040001017A do Backlog publish2 stat/%topic%/EFFECT color; power4 1 endon 
on event#rgb_cycle do tuyasend4 102,0 endon on event#color do backlog tuyasend4 102,1 ; TuyaSend3 103,%value%ffff6464 endon 
on TuyaReceived#data=55AA030700050D0400010121 do Backlog  publish2 stat/%topic%/Timer 1 Hour endon 
on TuyaReceived#data=55AA030700050D0400010222 do Backlog  publish2 stat/%topic%/Timer 2 Hours endon 
on TuyaReceived#data=55AA030700050D0400010323 do Backlog  publish2 stat/%topic%/Timer 3 Hours endon 

Rule2 on TuyaReceived#data=55AA030700050D0400010020 do Backlog  publish2 stat/%topic%/Timer On endon 
on TuyaReceived#data=55AA03070005650400010078 do  publish2 stat/%topic%/Mist 0 endon 
on TuyaReceived#data=55AA03070005650400010179 do  publish2 stat/%topic%/Mist 1 endon 
on event#TimerSet do tuyasend4 13,%value% endon
on event#TurnOff do power1 0 endon
on power1#state=1 do publish2 stat/%topic%/Timer On endon 
on power1#state=0 do publish2 stat/%topic%/Timer Off endon 

Backlog rule1 1; rule2 1

Home Assistant Configs :

fan:
  - platform: mqtt
    name: "Bedroom Diffuser"
    availability_topic: "tele/MasterDiffuser/LWT"
    payload_available: "Online"
    payload_not_available: "Offline"
    state_topic: "stat/MasterDiffuser/POWER1"
    command_topic: "cmnd/MasterDiffuser/POWER1"
    speed_state_topic: "stat/MasterDiffuser/Mist"
    payload_low_speed: "0"
    payload_high_speed: "1"
    speed_command_topic: "cmnd/MasterDiffuser/POWER3"
    qos: 1
    payload_on: "ON"
    payload_off: "OFF"
    speeds:
      - "off"
      - low
      - high

light:
  - platform: mqtt
    name: "Bedroom Diffuser Lamp"
    command_topic: "cmnd/MasterDiffuser/POWER2"
    state_topic: "stat/MasterDiffuser/POWER2"
    payload_on: "ON"
    payload_off: "OFF"
    effect_state_topic: "stat/MasterDiffuser/EFFECT"
    effect_command_topic: "cmnd/MasterDiffuser/EVENT"
    effect_list:
      - rgb_cycle
      - color
    availability_topic: "tele/MasterDiffuser/LWT"
    payload_available: "Online"
    payload_not_available: "Offline"
    qos: 1
    retain: false
    rgb_command_topic: "cmnd/MasterDiffuser/EVENT"
    rgb_command_template: "{{ 'color=%02x%02x%02x' | format(red, green, blue)}}"
    rgb_value_template: "{% if value_json.TuyaReceived is defined and value_json['TuyaReceived']['103'].DpId == 103 %}{{ (value_json['TuyaReceived']['103'].Type3Data[0:2]|int(base=16),value_json['TuyaReceived']['103'].Type3Data[2:4]|int(base=16),value_json['TuyaReceived']['103'].Type3Data[4:6]|int(base=16)) | join(',')}}{% endif %}"
    rgb_state_topic: "tele/MasterDiffuser/RESULT"

input_select:
  diffuser_timer:
    name: Bedroom Diffuser Timer
    options:
      - "1 Hour"
      - "2 Hours"
      - "3 Hours"
      - "On"
      - "Off"
    initial: "Off"
    icon: mdi:alarm

  - platform: mqtt
    state_topic: "BDCountdown"
    name: "Bedroom Diffuser Countdown"

I then use Node red to populate and control the Timers using MQTT. This will allow update of a timer countdown, Selection of Timer Mode and has some timers to overcome the device turning back on automatically due to a timing issue.

Here is the flow :

[ { "id": "9d355282.c77dd", "type": "tab", "label": "Flow 1", "disabled": false, "info": "" }, { "id": "b0ad145d.96a898", "type": "server-state-changed", "z": "9d355282.c77dd", "name": "", "server": "13b4f076.24abd", "version": 1, "exposeToHomeAssistant": false, "haConfig": [ { "property": "name", "value": "" }, { "property": "icon", "value": "" } ], "entityidfilter": "input_select.diffuser_timer", "entityidfiltertype": "exact", "outputinitially": false, "state_type": "str", "haltifstate": "", "halt_if_type": "str", "halt_if_compare": "is", "outputs": 1, "output_only_on_state_change": true, "for": "0", "forType": "num", "forUnits": "seconds", "ignorePrevStateNull": false, "ignorePrevStateUnknown": false, "ignorePrevStateUnavailable": false, "ignoreCurrentStateUnknown": false, "ignoreCurrentStateUnavailable": false, "x": 300, "y": 260, "wires": [ [ "74958be1.d591a4" ] ] }, { "id": "349dce32.d69e42", "type": "mqtt out", "z": "9d355282.c77dd", "name": "", "topic": "cmnd/MasterDiffuser/EVENT", "qos": "", "retain": "", "broker": "25239954.84f446", "x": 880, "y": 260, "wires": [] }, { "id": "74958be1.d591a4", "type": "function", "z": "9d355282.c77dd", "name": "", "func": "switch (msg.payload) {\ncase \"1 Hour\":\n msg.payload = 'TimerSet=1';\n return msg;\ncase \"2 Hours\":\n msg.payload = \"TimerSet=2\";\n return msg;\ncase \"3 Hours\":\n msg.payload = \"TimerSet=3\";\n return msg;\ncase \"On\":\n msg.payload = \"TimerSet=0\";\n return msg;\ndefault:\n msg.payload = \"TurnOff\";\n return msg;\n}\n", "outputs": 1, "noerr": 0, "initialize": "", "finalize": "", "x": 580, "y": 260, "wires": [ [ "349dce32.d69e42" ] ] }, { "id": "9ac76bb6.035588", "type": "mqtt in", "z": "9d355282.c77dd", "name": "", "topic": "stat/MasterDiffuser/Timer", "qos": "2", "datatype": "utf8", "broker": "25239954.84f446", "x": 210, "y": 200, "wires": [ [ "249ec213.b54d3e" ] ] }, { "id": "6f073103.3c458", "type": "api-call-service", "z": "9d355282.c77dd", "name": "", "server": "13b4f076.24abd", "version": 1, "debugenabled": false, "service_domain": "input_select", "service": "select_option", "entityId": "input_select.diffuser_timer", "data": "{\"option\":msg.payload}", "dataType": "jsonata", "mergecontext": "", "output_location": "", "output_location_type": "none", "mustacheAltTags": false, "x": 970, "y": 200, "wires": [ [] ] }, { "id": "4c297d74.8690f4", "type": "switch", "z": "9d355282.c77dd", "name": "", "property": "bdtimeout", "propertyType": "global", "rules": [ { "t": "eq", "v": "False", "vt": "str" } ], "checkall": "false", "repair": false, "outputs": 1, "x": 630, "y": 200, "wires": [ [ "bd791dce.7f7aa", "6f073103.3c458" ] ] }, { "id": "164e346b.aa84fc", "type": "stoptimer", "z": "9d355282.c77dd", "duration": "3", "units": "Second", "payloadtype": "num", "payloadval": "0", "name": "", "x": 760, "y": 140, "wires": [ [ "431e0bd1.0fd174" ], [] ] }, { "id": "bd791dce.7f7aa", "type": "change", "z": "9d355282.c77dd", "name": "", "rules": [ { "t": "set", "p": "bdtimeout", "pt": "global", "to": "True", "tot": "str" } ], "action": "", "property": "", "from": "", "to": "", "reg": false, "x": 380, "y": 140, "wires": [ [ "164e346b.aa84fc" ] ] }, { "id": "431e0bd1.0fd174", "type": "change", "z": "9d355282.c77dd", "name": "", "rules": [ { "t": "set", "p": "bdtimeout", "pt": "global", "to": "False", "tot": "str" } ], "action": "", "property": "", "from": "", "to": "", "reg": false, "x": 1000, "y": 140, "wires": [ [] ] }, { "id": "6eec2921.a79408", "type": "config", "z": "9d355282.c77dd", "name": "", "properties": [ { "p": "bdtimeout", "pt": "global", "to": "False", "tot": "str" } ], "active": true, "x": 190, "y": 40, "wires": [] }, { "id": "249ec213.b54d3e", "type": "stoptimer", "z": "9d355282.c77dd", "duration": "1", "units": "Second", "payloadtype": "num", "payloadval": "0", "name": "", "x": 440, "y": 200, "wires": [ [ "4c297d74.8690f4" ], [] ] }, { "id": "15f8a0bf.fee4cf", "type": "comment", "z": "9d355282.c77dd", "name": "Bedroom Diffuser Set", "info": "Bedroom Diffuser Set\n", "x": 200, "y": 100, "wires": [] }, { "id": "18417053.35d32", "type": "mqtt in", "z": "9d355282.c77dd", "name": "", "topic": "tele/MasterDiffuser/RESULT", "qos": "2", "datatype": "auto", "broker": "25239954.84f446", "x": 220, "y": 360, "wires": [ [ "9dd19121.32bc9" ] ] }, { "id": "9dd19121.32bc9", "type": "json", "z": "9d355282.c77dd", "name": "", "property": "payload", "action": "", "pretty": false, "x": 430, "y": 360, "wires": [ [ "417ebb8a.9ab164" ] ] }, { "id": "417ebb8a.9ab164", "type": "function", "z": "9d355282.c77dd", "name": "", "func": "msg.payload = msg.payload.TuyaReceived.DpType2Id14\nreturn msg;", "outputs": 1, "noerr": 0, "initialize": "", "finalize": "", "x": 580, "y": 360, "wires": [ [ "4cedf721.387998" ] ] }, { "id": "4cedf721.387998", "type": "switch", "z": "9d355282.c77dd", "name": "", "property": "payload", "propertyType": "msg", "rules": [ { "t": "nnull" } ], "checkall": "true", "repair": false, "outputs": 1, "x": 730, "y": 360, "wires": [ [ "d39343bc.2c805" ] ] }, { "id": "d39343bc.2c805", "type": "api-current-state", "z": "9d355282.c77dd", "name": "", "server": "13b4f076.24abd", "version": 1, "outputs": 1, "halt_if": "", "halt_if_type": "str", "halt_if_compare": "is", "override_topic": false, "entity_id": "input_select.kdiffuser_timer", "state_type": "str", "state_location": "check", "override_payload": "msg", "entity_location": "data", "override_data": "msg", "blockInputOverrides": false, "x": 1000, "y": 360, "wires": [ [ "1b071f1f.08c731" ] ] }, { "id": "cc6caca6.5842b", "type": "mqtt out", "z": "9d355282.c77dd", "name": "", "topic": "BDCountdown", "qos": "0", "retain": "", "broker": "25239954.84f446", "x": 1480, "y": 360, "wires": [] }, { "id": "587a1e8f.b3829", "type": "mqtt out", "z": "9d355282.c77dd", "name": "", "topic": "BDCountdown", "qos": "0", "retain": "", "broker": "25239954.84f446", "x": 1480, "y": 440, "wires": [] }, { "id": "1b071f1f.08c731", "type": "switch", "z": "9d355282.c77dd", "name": "", "property": "check", "propertyType": "msg", "rules": [ { "t": "eq", "v": "On", "vt": "str" }, { "t": "eq", "v": "Off", "vt": "str" }, { "t": "nnull" } ], "checkall": "false", "repair": false, "outputs": 3, "x": 1270, "y": 360, "wires": [ [ "30cad0e8.3f16c" ], [ "30cad0e8.3f16c" ], [ "cc6caca6.5842b" ] ] }, { "id": "30cad0e8.3f16c", "type": "change", "z": "9d355282.c77dd", "name": "", "rules": [ { "t": "set", "p": "payload", "pt": "msg", "to": "check", "tot": "msg" } ], "action": "", "property": "", "from": "", "to": "", "reg": false, "x": 1300, "y": 440, "wires": [ [ "587a1e8f.b3829" ] ] }, { "id": "13b4f076.24abd", "type": "server", "name": "Home Assistant", "addon": true }, { "id": "25239954.84f446", "type": "mqtt-broker", "name": "", "broker": "192.168.0.160", "port": "1883", "clientid": "", "usetls": false, "compatmode": false, "keepalive": "60", "cleansession": true, "birthTopic": "", "birthQos": "0", "birthPayload": "", "closeTopic": "", "closeQos": "0", "closePayload": "", "willTopic": "", "willQos": "0", "willPayload": "" } ]”