Domoticz

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return {
    on = {
        devices = { 'Door Sensor' },  -- Replace with your door sensor name
        timer = { 'every 5 minutes' }
    },

    data = {
        lastDoorState = { initial = '' }
    },

    logging = {
        level = domoticz.LOG_INFO,
        marker = "DoorHeatingControl"
    },

    execute = function(domoticz, trigger)
        local door = domoticz.devices('Door Sensor')       -- Replace with your door sensor name
        local thermostat = domoticz.devices('Thermostat')  -- Replace with your thermostat name

        local tempLow = 15  -- Temperature to set when door is open

        -- Ensure the variable exists
        local savedVar = domoticz.variables('ThermoSavedSetpoint')
        if not savedVar then
            domoticz.variables.create('ThermoSavedSetpoint', 21)  -- Default to 21 if not set
            savedVar = domoticz.variables('ThermoSavedSetpoint')
        end

        if door.state == 'Open' then
            if domoticz.data.lastDoorState ~= 'Open' then
                -- Save the current setpoint only when door first opens
                savedVar.set(thermostat.setPoint)
                thermostat.updateSetPoint(tempLow)
                domoticz.log("Door opened -> saved setpoint (" .. savedVar.value .. ") and set thermostat to LOW (" .. tempLow .. "°C)", domoticz.LOG_INFO)
            end
            domoticz.data.lastDoorState = 'Open'

        elseif door.state == 'Closed' then
            if domoticz.data.lastDoorState ~= 'Closed' then
                -- Restore previous setpoint when door closes
                thermostat.updateSetPoint(savedVar.value)
                domoticz.log("Door closed -> restored thermostat to previous setpoint (" .. savedVar.value .. "°C)", domoticz.LOG_INFO)
            end
            domoticz.data.lastDoorState = 'Closed'
        else
            domoticz.log("Unknown door state: " .. door.state, domoticz.LOG_ERROR)
        end
    end
}

Code: Select all

Setup Checklist:
- Create a user variable in Domoticz named ThermoSavedSetpoint (type: Integer), or let the script create it automatically.
- Replace the device names (Door Sensor, Thermostat) accordingly.
- Optional: adjust tempLow for your "door open" fallback temperature.