# Loxone MCP Control Enhancement - Requirements Document

## Introduction

This specification defines the requirements for enhancing the existing Loxone MCP (Model Context Protocol) server to provide comprehensive device control capabilities. Currently, the MCP server only supports read-only operations (listing devices, getting states, testing connections). This enhancement will add full bidirectional control functionality to enable automation, scene management, and direct device control through the MCP interface.

The enhancement focuses on the most critical control operations needed for home automation: lighting control, blind/cover management, scene triggering, and mood setting. This will transform the MCP server from a monitoring tool into a complete home automation control interface.

## Requirements

### Requirement 1: Basic Device Control Foundation

**User Story:** As a home automation user, I want to send basic commands to Loxone devices through the MCP interface, so that I can control my smart home devices programmatically.

#### Acceptance Criteria

1. WHEN I call a device control MCP tool with a valid device UUID and command THEN the system SHALL send the command to the Loxone Miniserver via WebSocket
2. WHEN the command is successfully sent THEN the system SHALL return a success response with device confirmation
3. WHEN the command fails THEN the system SHALL return a detailed error response with failure reason
4. WHEN I send a command to a non-existent device THEN the system SHALL return a "DEVICE_NOT_FOUND" error
5. WHEN I send an invalid command format THEN the system SHALL return a "INVALID_COMMAND" error with validation details

### Requirement 2: Lighting Control

**User Story:** As a user, I want to control lights (switches and dimmers) through the MCP interface, so that I can turn lights on/off and adjust brightness levels programmatically.

#### Acceptance Criteria

1. WHEN I call the switch control tool with a Switch device UUID and "On" command THEN the system SHALL turn on the light
2. WHEN I call the switch control tool with a Switch device UUID and "Off" command THEN the system SHALL turn off the light
3. WHEN I call the dimmer control tool with a LightControllerV2 device UUID and brightness value (0-100) THEN the system SHALL set the light to that brightness level
4. WHEN I set brightness to 0 on a dimmer THEN the system SHALL turn off the light
5. WHEN I set brightness above 0 on a dimmer THEN the system SHALL turn on the light and set the brightness
6. WHEN I provide an invalid brightness value (outside 0-100 range) THEN the system SHALL return a validation error
7. WHEN the light state changes THEN the system SHALL update the local device state cache

### Requirement 3: Blind and Cover Control

**User Story:** As a user, I want to control blinds, jalousies, and covers through the MCP interface, so that I can open, close, and position them automatically.

#### Acceptance Criteria

1. WHEN I call the cover control tool with a Jalousie device UUID and "Open" command THEN the system SHALL fully open the cover (100% position)
2. WHEN I call the cover control tool with a Jalousie device UUID and "Close" command THEN the system SHALL fully close the cover (0% position)
3. WHEN I call the cover control tool with a Jalousie device UUID and position value (0-100) THEN the system SHALL move the cover to that position
4. WHEN I call the cover control tool with a Jalousie device UUID and "Stop" command THEN the system SHALL stop the cover movement
5. WHEN I control a Jalousie with tilt capability AND provide tilt angle THEN the system SHALL adjust both position and tilt
6. WHEN I provide invalid position values (outside 0-100 range) THEN the system SHALL return a validation error
7. WHEN the cover position changes THEN the system SHALL update the local device state cache

### Requirement 4: Scene and State Triggering

**User Story:** As a user, I want to trigger Loxone scenes and states (like "Schlafen" sleep mode) through the MCP interface, so that I can activate predefined automation scenarios.

#### Acceptance Criteria

1. WHEN I call the scene trigger tool with a valid scene UUID THEN the system SHALL activate the scene on the Loxone Miniserver
2. WHEN I call the state trigger tool with a Switch device UUID representing a state (like "Schlafen") THEN the system SHALL toggle or activate that state
3. WHEN I trigger the "Schlafen" (sleep) state THEN the system SHALL execute all associated automation actions (lights off, blinds closed, etc.)
4. WHEN I trigger the "Abwesend" (away) state THEN the system SHALL execute the away mode automation
5. WHEN a scene is successfully triggered THEN the system SHALL return confirmation with scene name and activation status
6. WHEN I attempt to trigger a non-existent scene THEN the system SHALL return a "SCENE_NOT_FOUND" error

### Requirement 5: Advanced Lighting Control (Moods and Colors)

**User Story:** As a user, I want to set lighting moods and control color-capable lights through the MCP interface, so that I can create ambiance and lighting scenes.

#### Acceptance Criteria

1. WHEN I call the mood control tool with a Mood device UUID THEN the system SHALL activate the lighting mood
2. WHEN I call the color control tool with a ColorPickerV2 device UUID and RGB color value THEN the system SHALL set the light to that color
3. WHEN I call the color control tool with HSV values THEN the system SHALL convert and apply the color correctly
4. WHEN I set a lighting mood THEN all associated lights SHALL change to their predefined mood settings
5. WHEN I provide invalid color values THEN the system SHALL return a validation error with acceptable formats
6. WHEN color lights are controlled THEN the system SHALL update both color and brightness state information

### Requirement 6: Climate and Environmental Control

**User Story:** As a user, I want to control climate devices (temperature, ventilation) through the MCP interface, so that I can manage environmental conditions programmatically.

#### Acceptance Criteria

1. WHEN I call the temperature control tool with an IRoomControllerV2 device UUID and target temperature THEN the system SHALL set the room temperature target
2. WHEN I call the ventilation control tool with a Ventilation device UUID and speed percentage THEN the system SHALL set the fan speed
3. WHEN I provide temperature values outside reasonable range (5-35°C) THEN the system SHALL return a validation error
4. WHEN I provide fan speed values outside 0-100% range THEN the system SHALL return a validation error
5. WHEN climate settings change THEN the system SHALL update the device state cache with new target values

### Requirement 7: Secured Device Control

**User Story:** As a user, I want to control secured devices that require PIN authentication through the MCP interface, so that I can manage security-sensitive devices safely.

#### Acceptance Criteria

1. WHEN I call a secured device control tool with a valid PIN code THEN the system SHALL authenticate and execute the command
2. WHEN I call a secured device control tool with an invalid PIN code THEN the system SHALL return an "AUTHENTICATION_FAILED" error
3. WHEN I attempt to control a secured device without providing a PIN THEN the system SHALL return a "PIN_REQUIRED" error
4. WHEN secured commands are executed THEN the system SHALL log the action for security audit purposes

### Requirement 8: Batch Operations and Room Control

**User Story:** As a user, I want to control multiple devices simultaneously or all devices in a room through the MCP interface, so that I can efficiently manage groups of devices.

#### Acceptance Criteria

1. WHEN I call the room control tool with a room name and "lights_off" action THEN the system SHALL turn off all lights in that room
2. WHEN I call the room control tool with a room name and "lights_on" action THEN the system SHALL turn on all lights in that room
3. WHEN I call the room control tool with a room name and "blinds_close" action THEN the system SHALL close all blinds in that room
4. WHEN I call the batch control tool with multiple device commands THEN the system SHALL execute all commands and return individual results
5. WHEN any command in a batch operation fails THEN the system SHALL continue with remaining commands and report all results
6. WHEN room control affects multiple devices THEN the system SHALL return a summary of affected devices and their results

### Requirement 9: Real-time State Synchronization

**User Story:** As a user, I want the MCP server to maintain accurate device states when I control devices, so that subsequent state queries reflect the actual device status.

#### Acceptance Criteria

1. WHEN I control a device through the MCP interface THEN the local device state cache SHALL be updated immediately
2. WHEN the Loxone Miniserver sends state update messages THEN the system SHALL update the corresponding device states
3. WHEN I query device state after a control operation THEN the returned state SHALL reflect the new device status
4. WHEN state updates are received from the Miniserver THEN registered callbacks SHALL be notified of the changes
5. WHEN the WebSocket connection is lost and restored THEN the system SHALL resynchronize all device states

### Requirement 10: Error Handling and Resilience

**User Story:** As a developer integrating with the MCP interface, I want comprehensive error handling and resilience features, so that my applications can handle failures gracefully.

#### Acceptance Criteria

1. WHEN the WebSocket connection to the Miniserver is lost THEN the system SHALL attempt automatic reconnection
2. WHEN commands are sent during a connection outage THEN the system SHALL return appropriate connection error responses
3. WHEN the Miniserver returns error responses THEN the system SHALL parse and forward meaningful error messages
4. WHEN command timeouts occur THEN the system SHALL return timeout errors with retry suggestions
5. WHEN invalid device UUIDs are provided THEN the system SHALL validate against the known device registry
6. WHEN system errors occur THEN detailed logging SHALL be provided for debugging purposes