MCP Implementation: Complete Transport Implementation and Testing

[kgoderis]

MCP Implementation: Complete Transport Implementation and Testing

Overview

Complete the remaining transport implementation and comprehensive testing for the openHAB MCP bundle.

Current Status

• ✅ Core SDK integration complete (100%)
• ✅ STDIO transport working
• 🔄 Additional transports need implementation
• ⏳ Testing framework needs to be established

Transport Implementation Tasks

SSE Transport Implementation

• Add Jakarta Servlet dependencies to pom.xml
  • Add jakarta.servlet-api dependency
  • Add jakarta.servlet.jsp-api dependency if needed
  • Update dependency management section
• Implement HttpServletSseServerTransportProvider integration
  • Update createSseTransport() method in MCPServerInstance
  • Add proper error handling and fallback logic
  • Configure SSE endpoints (/mcp/message, /mcp/events)
  • Add ObjectMapper configuration for SSE
• Add SSE configuration options to MCPServerConfiguration
  • Add baseUrl configuration property
  • Add messageEndpoint configuration property
  • Add sseEndpoint configuration property
  • Add enableSse boolean flag
• Test SSE transport with real MCP clients
  • Test with Claude Desktop
  • Test with GPT-4 MCP client
  • Test with custom MCP client
  • Validate message flow and error handling

WebSocket Transport Implementation

• Research WebSocket server libraries
  • Evaluate Netty WebSocket support
  • Evaluate Jetty WebSocket support
  • Evaluate Spring WebSocket support
  • Choose optimal library for openHAB environment
• Create custom WebSocket transport provider
  • Implement WebSocketServerTransportProvider class
  • Implement McpServerTransportProvider interface methods
  • Implement McpTransport interface methods
  • Add Reactor support for async operations
  • Implement proper session management
• Implement WebSocket message handling
  • Handle WebSocket connection lifecycle
  • Implement JSON-RPC message parsing
  • Add message validation and error handling
  • Implement bidirectional communication
  • Add connection pooling and management
• Add WebSocket configuration options
  • Add port configuration property
  • Add path configuration property
  • Add enableWebSocket boolean flag
  • Add WebSocket protocol configuration
  • Add connection timeout settings
• Test WebSocket transport with real MCP clients
  • Test with browser-based MCP clients
  • Test with Node.js MCP clients
  • Test connection stability and reconnection
  • Test concurrent connections

Transport Configuration Enhancement

• Add transport type configuration to MCPServerConfiguration
  • Add transportType enum (STDIO, SSE, WEBSOCKET)
  • Add transport selection logic in createTransport()
  • Add transport validation and fallback logic
• Add transport-specific configuration options
  • Create transport-specific configuration classes
  • Add configuration validation
  • Add default configuration values
  • Add configuration documentation
• Implement transport selection logic
  • Add priority-based transport selection
  • Add transport availability checking
  • Add automatic fallback to STDIO
  • Add transport health checking
• Add transport health monitoring
  • Implement transport status monitoring
  • Add transport metrics collection
  • Add transport failure detection
  • Add automatic transport switching
• Add transport logging and debugging
  • Add detailed transport operation logging
  • Add transport performance metrics
  • Add transport error reporting
  • Add transport debugging tools

Testing & Validation Tasks

Unit Tests

• Test MCPServerInstance with real SDK classes
  • Test server initialization with different configurations
  • Test server lifecycle (start/stop/restart)
  • Test server state management
  • Test error handling and recovery scenarios
  • Test server capabilities configuration
  • Test tool registration and management
• Test MCPToolRegistry with real tool specifications
  • Test tool registration and unregistration
  • Test tool specification generation
  • Test tool adapter creation and management
  • Test concurrent tool operations
  • Test tool validation and error handling
• Test MCPToolAdapter with real tool callbacks
  • Test tool definition generation
  • Test tool execution with various parameters
  • Test tool context handling
  • Test tool error handling and recovery
  • Test tool performance and timeouts
• Test transport providers (STDIO, SSE, WebSocket)
  • Test STDIO transport creation and operation
  • Test SSE transport creation and operation (when available)
  • Test WebSocket transport creation and operation (when available)
  • Test transport fallback mechanisms
  • Test transport error handling

Integration Tests

• Test with real MCP clients (Claude, GPT-4, etc.)
  • Test with Claude Desktop application
  • Test with GPT-4 MCP client
  • Test with custom MCP client implementations
  • Test client connection and disconnection
  • Test client authentication (if implemented)
• Test tool execution with real openHAB services
  • Test item listing and management tools
  • Test thing management tools
  • Test channel management tools
  • Test rule management tools
  • Test configuration management tools
  • Test system management tools

Performance Testing

• Benchmark tool execution performance
  • Measure tool execution latency
  • Test tool execution throughput
  • Profile memory usage during tool execution
  • Identify performance bottlenecks
  • Optimize slow-performing tools
• Test server startup/shutdown times
  • Measure server initialization time
  • Measure server startup time
  • Measure server shutdown time
  • Test server restart performance
  • Optimize startup/shutdown procedures
• Test memory usage under load
  • Monitor memory usage during normal operation
  • Test memory usage under high load
  • Test memory usage with many concurrent clients
  • Identify memory leaks and optimize
  • Test garbage collection impact

Documentation Tasks

• Update README with SDK integration details
• Create usage examples and tutorials
• Document configuration options
• Document troubleshooting guide
• Create API documentation

Dependencies

• Jakarta Servlet API for SSE transport
• WebSocket server library (TBD)
• Testing framework setup
• Real MCP client access for testing

Priority

High - Transport implementation is the main remaining technical work needed to complete the MCP bundle.

Labels

• enhancement
• mcp
• transport
• testing
• documentation

[wborn]

Are you working on this @kgoderis?