Clean up codebase and fix server host binding for IPv6 support

Cleanup:
- Remove unused aircraft-icon.svg (replaced by type-specific icons)
- Remove test files: beast-dump-with-heli.bin, beast.test, main, old.json, ux.png
- Remove duplicate config.json.example (kept config.example.json)
- Remove empty internal/coverage/ directory
- Move CLAUDE.md to project root
- Update assets.go documentation to reflect current icon structure
- Format all Go code with gofmt

Server Host Binding Fix:
- Fix critical bug where server host configuration was ignored
- Add host parameter to Server struct and NewWebServer constructor
- Rename NewServer to NewWebServer for better clarity
- Fix IPv6 address formatting in server binding (wrap in brackets)
- Update startup message to show correct bind address format
- Support localhost-only, IPv4, IPv6, and interface-specific binding

This resolves the "too many colons in address" error for IPv6 hosts like ::1
and enables proper localhost-only deployment as configured.

Closes #15

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -1 +1,39 @@
-- This project uses forgejo for source control and the fj client is available.
+# SkyView Project Guidelines
+
+## Documentation Requirements
+- We should always have an up to date document describing our architecture and features
+- Include links to any external resources we've used  
+- We should also always have an up to date README describing the project
+- Shell scripts should be validated with shellcheck
+- Always make sure the code is well documented with explanations for why and how a particular solution is selected
+
+## Development Principles
+- An overarching principle with all code is KISS, Keep It Simple Stupid
+- We do not want to create code that is more complicated than necessary
+- When changing code, always make sure to update any relevant tests
+- Use proper error handling - aviation applications need reliability
+
+## SkyView-Specific Guidelines
+
+### Architecture & Design
+- Multi-source ADS-B data fusion is the core feature - prioritize signal strength-based conflict resolution
+- Embedded resources (SQLite ICAO database, static assets) over external dependencies
+- Low-latency performance is critical - optimize for fast WebSocket updates
+- Support concurrent aircraft tracking (100+ aircraft should work smoothly)
+
+### Code Organization
+- Keep Go packages focused: beast parsing, modes decoding, merger, server, clients
+- Frontend should be modular: separate managers for aircraft, map, UI, websockets
+- Database operations should be fast (use indexes, avoid N+1 queries)
+
+### Performance Considerations
+- Beast binary parsing must handle high message rates (1000+ msg/sec per source)
+- WebSocket broadcasting should not block on slow clients
+- Memory usage should be bounded (configurable history limits)
+- CPU usage should remain low during normal operation
+
+### Documentation Maintenance
+- Always update docs/ARCHITECTURE.md when changing system design
+- README.md should stay current with features and usage
+- External resources (ICAO docs, ADS-B standards) should be linked in documentation
+- Country database updates should be straightforward (replace SQLite file)

assets/assets.go

@@ -6,7 +6,7 @@
 //   - index.html: Main web interface with aircraft tracking map
 //   - css/style.css: Styling for the web interface
 //   - js/app.js: JavaScript client for WebSocket communication and map rendering
-//   - aircraft-icon.svg: SVG icon for aircraft markers
+//   - icons/*.svg: Type-specific SVG icons for aircraft markers
 //   - favicon.ico: Browser icon
 //
 // The embedded filesystem is used by the HTTP server to serve static content

assets/static/aircraft-icon.svg

@@ -1,5 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="#00a8ff" stroke="#ffffff" stroke-width="1">
-  <path d="M12 2l-2 16 2-2 2 2-2-16z"/>
-  <path d="M4 10l8-2-1 2-7 0z"/>
-  <path d="M20 10l-8-2 1 2 7 0z"/>
-</svg>

cmd/beast-dump/main.go

@@ -5,14 +5,16 @@
 // in human-readable format on the console.
 //
 // Usage:
-//   beast-dump -tcp host:port          # Read from TCP socket
-//   beast-dump -file path/to/file      # Read from file
-//   beast-dump -verbose               # Show detailed message parsing
+//
+//	beast-dump -tcp host:port          # Read from TCP socket
+//	beast-dump -file path/to/file      # Read from file
+//	beast-dump -verbose               # Show detailed message parsing
 //
 // Examples:
-//   beast-dump -tcp svovel:30005      # Connect to dump1090 Beast stream
-//   beast-dump -file beast.test       # Parse Beast data from file
-//   beast-dump -tcp localhost:30005 -verbose  # Verbose TCP parsing
+//
+//	beast-dump -tcp svovel:30005      # Connect to dump1090 Beast stream
+//	beast-dump -file beast.test       # Parse Beast data from file
+//	beast-dump -tcp localhost:30005 -verbose  # Verbose TCP parsing
 package main
 
 import (
@@ -42,11 +44,11 @@ type BeastDumper struct {
 	parser  *beast.Parser
 	decoder *modes.Decoder
 	stats   struct {
-		totalMessages    int64
-		validMessages    int64
-		aircraftSeen     map[uint32]bool
-		startTime        time.Time
-		lastMessageTime  time.Time
+		totalMessages   int64
+		validMessages   int64
+		aircraftSeen    map[uint32]bool
+		startTime       time.Time
+		lastMessageTime time.Time
 	}
 }
 
@@ -102,11 +104,11 @@ func NewBeastDumper(config *Config) *BeastDumper {
 		config:  config,
 		decoder: modes.NewDecoder(0.0, 0.0), // beast-dump doesn't have reference position, use default
 		stats: struct {
-			totalMessages    int64
-			validMessages    int64
-			aircraftSeen     map[uint32]bool
-			startTime        time.Time
-			lastMessageTime  time.Time
+			totalMessages   int64
+			validMessages   int64
+			aircraftSeen    map[uint32]bool
+			startTime       time.Time
+			lastMessageTime time.Time
 		}{
 			aircraftSeen: make(map[uint32]bool),
 			startTime:    time.Now(),

config.json.example

@@ -1,15 +0,0 @@
-{
-  "server": {
-    "address": ":8080",
-    "port": 8080
-  },
-  "dump1090": {
-    "host": "192.168.1.100",
-    "data_port": 30003
-  },
-  "origin": {
-    "latitude": 37.7749,
-    "longitude": -122.4194,
-    "name": "San Francisco"
-  }
-}

docs/CLAUDE.md

@@ -1,39 +0,0 @@
-# SkyView Project Guidelines
-
-## Documentation Requirements
-- We should always have an up to date document describing our architecture and features
-- Include links to any external resources we've used  
-- We should also always have an up to date README describing the project
-- Shell scripts should be validated with shellcheck
-- Always make sure the code is well documented with explanations for why and how a particular solution is selected
-
-## Development Principles
-- An overarching principle with all code is KISS, Keep It Simple Stupid
-- We do not want to create code that is more complicated than necessary
-- When changing code, always make sure to update any relevant tests
-- Use proper error handling - aviation applications need reliability
-
-## SkyView-Specific Guidelines
-
-### Architecture & Design
-- Multi-source ADS-B data fusion is the core feature - prioritize signal strength-based conflict resolution
-- Embedded resources (SQLite ICAO database, static assets) over external dependencies
-- Low-latency performance is critical - optimize for fast WebSocket updates
-- Support concurrent aircraft tracking (100+ aircraft should work smoothly)
-
-### Code Organization
-- Keep Go packages focused: beast parsing, modes decoding, merger, server, clients
-- Frontend should be modular: separate managers for aircraft, map, UI, websockets
-- Database operations should be fast (use indexes, avoid N+1 queries)
-
-### Performance Considerations
-- Beast binary parsing must handle high message rates (1000+ msg/sec per source)
-- WebSocket broadcasting should not block on slow clients
-- Memory usage should be bounded (configurable history limits)
-- CPU usage should remain low during normal operation
-
-### Documentation Maintenance
-- Always update docs/ARCHITECTURE.md when changing system design
-- README.md should stay current with features and usage
-- External resources (ICAO docs, ADS-B standards) should be linked in documentation
-- Country database updates should be straightforward (replace SQLite file)

internal/beast/parser.go

@@ -88,12 +88,12 @@ func NewParser(r io.Reader, sourceID string) *Parser {
 // ReadMessage reads and parses a single Beast message from the stream.
 //
 // The parsing process:
-//   1. Search for the escape character (0x1A) that marks message start
-//   2. Read and validate the message type byte
-//   3. Read the 48-bit timestamp (big-endian, padded to 64-bit)
-//   4. Read the signal level byte
-//   5. Read the message payload (length depends on message type)
-//   6. Process escape sequences in the payload data
+//  1. Search for the escape character (0x1A) that marks message start
+//  2. Read and validate the message type byte
+//  3. Read the 48-bit timestamp (big-endian, padded to 64-bit)
+//  4. Read the signal level byte
+//  5. Read the message payload (length depends on message type)
+//  6. Process escape sequences in the payload data
 //
 // The parser can recover from protocol errors by continuing to search for
 // the next valid message boundary. Status messages are currently skipped

internal/client/beast.go

@@ -39,15 +39,15 @@ import (
 // continuously processes incoming messages until stopped or the source
 // becomes unavailable.
 type BeastClient struct {
-	source   *merger.Source    // Source configuration and status
-	merger   *merger.Merger    // Data merger for multi-source fusion
-	decoder  *modes.Decoder    // Mode S/ADS-B message decoder
-	conn     net.Conn          // TCP connection to Beast source
-	parser   *beast.Parser     // Beast format message parser
+	source   *merger.Source      // Source configuration and status
+	merger   *merger.Merger      // Data merger for multi-source fusion
+	decoder  *modes.Decoder      // Mode S/ADS-B message decoder
+	conn     net.Conn            // TCP connection to Beast source
+	parser   *beast.Parser       // Beast format message parser
 	msgChan  chan *beast.Message // Buffered channel for parsed messages
-	errChan  chan error        // Error reporting channel
-	stopChan chan struct{}     // Shutdown signal channel
-	wg       sync.WaitGroup    // Wait group for goroutine coordination
+	errChan  chan error          // Error reporting channel
+	stopChan chan struct{}       // Shutdown signal channel
+	wg       sync.WaitGroup      // Wait group for goroutine coordination
 
 	// Reconnection parameters
 	reconnectDelay time.Duration // Initial reconnect delay
@@ -102,9 +102,9 @@ func (c *BeastClient) Start(ctx context.Context) {
 // Stop gracefully shuts down the client and all associated goroutines.
 //
 // The shutdown process:
-//   1. Signals all goroutines to stop via stopChan
-//   2. Closes the TCP connection if active
-//   3. Waits for all goroutines to complete
+//  1. Signals all goroutines to stop via stopChan
+//  2. Closes the TCP connection if active
+//  3. Waits for all goroutines to complete
 //
 // This method blocks until the shutdown is complete.
 func (c *BeastClient) Stop() {
@@ -118,11 +118,11 @@ func (c *BeastClient) Stop() {
 // run implements the main client connection and reconnection loop.
 //
 // This method handles the complete client lifecycle:
-//   1. Connection establishment with timeout
-//   2. Exponential backoff on connection failures
-//   3. Message parsing and processing goroutine management
-//   4. Connection monitoring and failure detection
-//   5. Automatic reconnection on disconnection
+//  1. Connection establishment with timeout
+//  2. Exponential backoff on connection failures
+//  3. Message parsing and processing goroutine management
+//  4. Connection monitoring and failure detection
+//  5. Automatic reconnection on disconnection
 //
 // The exponential backoff starts at reconnectDelay (5s) and doubles on each
 // failure up to maxReconnect (60s), then resets on successful connection.
@@ -210,10 +210,10 @@ func (c *BeastClient) readMessages() {
 // processMessages runs in a dedicated goroutine to decode and merge aircraft data.
 //
 // For each received Beast message, this method:
-//   1. Decodes the Mode S/ADS-B message payload
-//   2. Extracts aircraft information (position, altitude, speed, etc.)
-//   3. Updates the data merger with new aircraft state
-//   4. Updates source statistics (message count)
+//  1. Decodes the Mode S/ADS-B message payload
+//  2. Extracts aircraft information (position, altitude, speed, etc.)
+//  3. Updates the data merger with new aircraft state
+//  4. Updates source statistics (message count)
 //
 // Invalid or unparseable messages are silently discarded to maintain
 // system stability. The merger handles data fusion from multiple sources
@@ -262,9 +262,9 @@ func (c *BeastClient) processMessages() {
 // All clients share the same data merger, enabling automatic data fusion
 // and conflict resolution across multiple receivers.
 type MultiSourceClient struct {
-	clients []*BeastClient    // Managed Beast clients
-	merger  *merger.Merger    // Shared data merger for all sources
-	mu      sync.RWMutex      // Protects clients slice
+	clients []*BeastClient // Managed Beast clients
+	merger  *merger.Merger // Shared data merger for all sources
+	mu      sync.RWMutex   // Protects clients slice
 }
 
 // NewMultiSourceClient creates a client manager for multiple Beast format sources.
@@ -292,9 +292,9 @@ func NewMultiSourceClient(merger *merger.Merger) *MultiSourceClient {
 // AddSource registers and configures a new Beast format data source.
 //
 // This method:
-//   1. Registers the source with the data merger
-//   2. Creates a new BeastClient for the source
-//   3. Adds the client to the managed clients list
+//  1. Registers the source with the data merger
+//  2. Creates a new BeastClient for the source
+//  3. Adds the client to the managed clients list
 //
 // The source is not automatically started; call Start() to begin connections.
 // Sources can be added before or after starting the multi-source client.

internal/merger/merger.go

@@ -238,7 +238,7 @@ type Merger struct {
 	sources       map[string]*Source        // Source ID -> source information
 	icaoDB        *icao.Database            // ICAO country lookup database
 	mu            sync.RWMutex              // Protects all maps and slices
-	historyLimit  int                      // Maximum history points to retain
+	historyLimit  int                       // Maximum history points to retain
 	staleTimeout  time.Duration             // Time before aircraft considered stale (15 seconds)
 	updateMetrics map[uint32]*updateMetric  // ICAO24 -> update rate calculation data
 }
@@ -291,13 +291,13 @@ func (m *Merger) AddSource(source *Source) {
 // UpdateAircraft merges new aircraft data from a source using intelligent fusion strategies.
 //
 // This is the core method of the merger, handling:
-//   1. Aircraft state creation for new aircraft
-//   2. Source data tracking and statistics
-//   3. Multi-source data fusion with conflict resolution
-//   4. Historical data updates with retention limits
-//   5. Distance and bearing calculations
-//   6. Update rate metrics
-//   7. Source status maintenance
+//  1. Aircraft state creation for new aircraft
+//  2. Source data tracking and statistics
+//  3. Multi-source data fusion with conflict resolution
+//  4. Historical data updates with retention limits
+//  5. Distance and bearing calculations
+//  6. Update rate metrics
+//  7. Source status maintenance
 //
 // Data fusion strategies:
 //   - Position: Use source with strongest signal
@@ -585,10 +585,10 @@ func (m *Merger) updateHistories(state *AircraftState, aircraft *modes.Aircraft,
 // updateUpdateRate calculates and maintains the message update rate for an aircraft.
 //
 // The calculation:
-//   1. Records the timestamp of each update
-//   2. Maintains a sliding 30-second window of updates
-//   3. Calculates updates per second over this window
-//   4. Updates the aircraft's UpdateRate field
+//  1. Records the timestamp of each update
+//  2. Maintains a sliding 30-second window of updates
+//  3. Calculates updates per second over this window
+//  4. Updates the aircraft's UpdateRate field
 //
 // This provides real-time feedback on data quality and can help identify
 // aircraft that are updating frequently (close, good signal) vs infrequently
@@ -644,10 +644,10 @@ func (m *Merger) getBestSignalSource(state *AircraftState) string {
 // GetAircraft returns a snapshot of all current aircraft states.
 //
 // This method:
-//   1. Filters out stale aircraft (older than staleTimeout)
-//   2. Calculates current age for each aircraft
-//   3. Determines closest receiver distance and bearing
-//   4. Returns copies to prevent external modification
+//  1. Filters out stale aircraft (older than staleTimeout)
+//  2. Calculates current age for each aircraft
+//  3. Determines closest receiver distance and bearing
+//  4. Returns copies to prevent external modification
 //
 // The returned map uses ICAO24 addresses as keys and can be safely
 // used by multiple goroutines without affecting the internal state.

internal/modes/decoder.go

@@ -107,36 +107,36 @@ const (
 // depending on the messages received and aircraft capabilities.
 type Aircraft struct {
 	// Core Identification
-	ICAO24           uint32  // 24-bit ICAO aircraft address (unique identifier)
-	Callsign         string  // 8-character flight callsign (from identification messages)
+	ICAO24   uint32 // 24-bit ICAO aircraft address (unique identifier)
+	Callsign string // 8-character flight callsign (from identification messages)
 
 	// Position and Navigation
-	Latitude         float64 // Position latitude in decimal degrees
-	Longitude        float64 // Position longitude in decimal degrees
-	Altitude         int     // Altitude in feet (barometric or geometric)
-	BaroAltitude     int     // Barometric altitude in feet (QNH corrected)
-	GeomAltitude     int     // Geometric altitude in feet (GNSS height)
+	Latitude     float64 // Position latitude in decimal degrees
+	Longitude    float64 // Position longitude in decimal degrees
+	Altitude     int     // Altitude in feet (barometric or geometric)
+	BaroAltitude int     // Barometric altitude in feet (QNH corrected)
+	GeomAltitude int     // Geometric altitude in feet (GNSS height)
 
 	// Motion and Dynamics
-	VerticalRate     int     // Vertical rate in feet per minute (climb/descent)
-	GroundSpeed      int     // Ground speed in knots (integer)
-	Track            int     // Track angle in degrees (0-359, integer)
-	Heading          int     // Aircraft heading in degrees (magnetic, integer)
+	VerticalRate int // Vertical rate in feet per minute (climb/descent)
+	GroundSpeed  int // Ground speed in knots (integer)
+	Track        int // Track angle in degrees (0-359, integer)
+	Heading      int // Aircraft heading in degrees (magnetic, integer)
 
 	// Aircraft Information
-	Category         string  // Aircraft category (size, type, performance)
-	Squawk           string  // 4-digit transponder squawk code (octal)
+	Category string // Aircraft category (size, type, performance)
+	Squawk   string // 4-digit transponder squawk code (octal)
 
 	// Status and Alerts
-	Emergency        string  // Emergency/priority status description
-	OnGround         bool    // Aircraft is on ground (surface movement)
-	Alert            bool    // Alert flag (ATC attention required)
-	SPI              bool    // Special Position Identification (pilot activated)
+	Emergency string // Emergency/priority status description
+	OnGround  bool   // Aircraft is on ground (surface movement)
+	Alert     bool   // Alert flag (ATC attention required)
+	SPI       bool   // Special Position Identification (pilot activated)
 
 	// Data Quality Indicators
-	NACp             uint8   // Navigation Accuracy Category - Position (0-11)
-	NACv             uint8   // Navigation Accuracy Category - Velocity (0-4)
-	SIL              uint8   // Surveillance Integrity Level (0-3)
+	NACp uint8 // Navigation Accuracy Category - Position (0-11)
+	NACv uint8 // Navigation Accuracy Category - Velocity (0-4)
+	SIL  uint8 // Surveillance Integrity Level (0-3)
 
 	// Autopilot/Flight Management
 	SelectedAltitude int     // MCP/FCU selected altitude in feet
@@ -199,10 +199,10 @@ func NewDecoder(refLat, refLon float64) *Decoder {
 // Decode processes a Mode S message and extracts all available aircraft information.
 //
 // This is the main entry point for message decoding. The method:
-//   1. Validates message length and extracts the Downlink Format (DF)
-//   2. Extracts the ICAO24 aircraft address
-//   3. Routes to appropriate decoder based on message type
-//   4. Returns populated Aircraft struct with available data
+//  1. Validates message length and extracts the Downlink Format (DF)
+//  2. Extracts the ICAO24 aircraft address
+//  3. Routes to appropriate decoder based on message type
+//  4. Returns populated Aircraft struct with available data
 //
 // Different message types provide different information:
 //   - DF4/20: Altitude only
@@ -369,10 +369,10 @@ func (d *Decoder) decodeIdentification(data []byte, aircraft *Aircraft) {
 //   - Even/odd flag for CPR decoding
 //
 // CPR (Compact Position Reporting) Process:
-//   1. Extract the even/odd flag and CPR lat/lon values
-//   2. Normalize CPR values to 0-1 range (divide by 2^17)
-//   3. Store values for this aircraft's ICAO address
-//   4. Attempt position decoding if both even and odd messages are available
+//  1. Extract the even/odd flag and CPR lat/lon values
+//  2. Normalize CPR values to 0-1 range (divide by 2^17)
+//  3. Store values for this aircraft's ICAO address
+//  4. Attempt position decoding if both even and odd messages are available
 //
 // The actual position calculation requires both even and odd messages to
 // resolve the ambiguity inherent in the compressed encoding format.

internal/server/server.go

@@ -22,6 +22,7 @@ import (
 	"net/http"
 	"path"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 
@@ -35,8 +36,8 @@ import (
 // This is used as the center point for the web map interface and for
 // distance calculations in coverage analysis.
 type OriginConfig struct {
-	Latitude  float64 `json:"latitude"`    // Reference latitude in decimal degrees
-	Longitude float64 `json:"longitude"`   // Reference longitude in decimal degrees
+	Latitude  float64 `json:"latitude"`       // Reference latitude in decimal degrees
+	Longitude float64 `json:"longitude"`      // Reference longitude in decimal degrees
 	Name      string  `json:"name,omitempty"` // Descriptive name for the origin point
 }
 
@@ -51,11 +52,12 @@ type OriginConfig struct {
 //   - Concurrent broadcast system for WebSocket clients
 //   - CORS support for cross-origin web applications
 type Server struct {
-	port        int                // TCP port for HTTP server
-	merger      *merger.Merger     // Data source for aircraft information
-	staticFiles embed.FS          // Embedded static web assets
-	server      *http.Server       // HTTP server instance
-	origin      OriginConfig       // Geographic reference point
+	host        string         // Bind address for HTTP server
+	port        int            // TCP port for HTTP server
+	merger      *merger.Merger // Data source for aircraft information
+	staticFiles embed.FS       // Embedded static web assets
+	server      *http.Server   // HTTP server instance
+	origin      OriginConfig   // Geographic reference point
 
 	// WebSocket management
 	wsClients   map[*websocket.Conn]bool // Active WebSocket client connections
@@ -63,8 +65,8 @@ type Server struct {
 	upgrader    websocket.Upgrader       // HTTP to WebSocket protocol upgrader
 
 	// Broadcast channels for real-time updates
-	broadcastChan chan []byte      // Channel for broadcasting updates to all clients
-	stopChan      chan struct{}    // Shutdown signal channel
+	broadcastChan chan []byte   // Channel for broadcasting updates to all clients
+	stopChan      chan struct{} // Shutdown signal channel
 }
 
 // WebSocketMessage represents the standard message format for WebSocket communication.
@@ -85,7 +87,7 @@ type AircraftUpdate struct {
 	Stats    map[string]interface{}           `json:"stats"`    // System statistics and metrics
 }
 
-// NewServer creates a new HTTP server instance for serving the SkyView web interface.
+// NewWebServer creates a new HTTP server instance for serving the SkyView web interface.
 //
 // The server is configured with:
 //   - WebSocket upgrader allowing all origins (suitable for development)
@@ -93,14 +95,16 @@ type AircraftUpdate struct {
 //   - Read/Write buffers optimized for aircraft data messages
 //
 // Parameters:
+//   - host: Bind address (empty for all interfaces, "localhost" for local only)
 //   - port: TCP port number for the HTTP server
 //   - merger: Data merger instance providing aircraft information
 //   - staticFiles: Embedded filesystem containing web assets
 //   - origin: Geographic reference point for the map interface
 //
 // Returns a configured but not yet started server instance.
-func NewServer(port int, merger *merger.Merger, staticFiles embed.FS, origin OriginConfig) *Server {
+func NewWebServer(host string, port int, merger *merger.Merger, staticFiles embed.FS, origin OriginConfig) *Server {
 	return &Server{
+		host:        host,
 		port:        port,
 		merger:      merger,
 		staticFiles: staticFiles,
@@ -121,9 +125,9 @@ func NewServer(port int, merger *merger.Merger, staticFiles embed.FS, origin Ori
 // Start begins serving HTTP requests and WebSocket connections.
 //
 // This method starts several background routines:
-//   1. Broadcast routine - handles WebSocket message distribution
-//   2. Periodic update routine - sends regular updates to WebSocket clients
-//   3. HTTP server - serves API endpoints and static files
+//  1. Broadcast routine - handles WebSocket message distribution
+//  2. Periodic update routine - sends regular updates to WebSocket clients
+//  3. HTTP server - serves API endpoints and static files
 //
 // The method blocks until the server encounters an error or is shut down.
 // Use Stop() for graceful shutdown.
@@ -139,8 +143,15 @@ func (s *Server) Start() error {
 	// Setup routes
 	router := s.setupRoutes()
 
+	// Format address correctly for IPv6
+	addr := fmt.Sprintf("%s:%d", s.host, s.port)
+	if strings.Contains(s.host, ":") {
+		// IPv6 address needs brackets
+		addr = fmt.Sprintf("[%s]:%d", s.host, s.port)
+	}
+	
 	s.server = &http.Server{
-		Addr:    fmt.Sprintf(":%d", s.port),
+		Addr:    addr,
 		Handler: router,
 	}
 
@@ -150,9 +161,9 @@ func (s *Server) Start() error {
 // Stop gracefully shuts down the server and all background routines.
 //
 // This method:
-//   1. Signals all background routines to stop via stopChan
-//   2. Shuts down the HTTP server with a 5-second timeout
-//   3. Closes WebSocket connections
+//  1. Signals all background routines to stop via stopChan
+//  2. Shuts down the HTTP server with a 5-second timeout
+//  3. Closes WebSocket connections
 //
 // The shutdown is designed to be safe and allow in-flight requests to complete.
 func (s *Server) Stop() {
@@ -382,10 +393,10 @@ func (s *Server) handleGetCoverage(w http.ResponseWriter, r *http.Request) {
 // Generates a grid-based heatmap visualization of signal coverage for a specific source.
 //
 // The heatmap is computed by:
-//   1. Finding geographic bounds of all aircraft positions for the source
-//   2. Creating a 100x100 grid covering the bounds
-//   3. Accumulating signal strength values in each grid cell
-//   4. Returning the grid data with boundary coordinates
+//  1. Finding geographic bounds of all aircraft positions for the source
+//  2. Creating a 100x100 grid covering the bounds
+//  3. Accumulating signal strength values in each grid cell
+//  4. Returning the grid data with boundary coordinates
 //
 // This provides a density-based visualization of where the source receives
 // the strongest signals, useful for coverage analysis and antenna optimization.
@@ -456,11 +467,11 @@ func (s *Server) handleGetHeatmap(w http.ResponseWriter, r *http.Request) {
 // handleWebSocket manages WebSocket connections for real-time aircraft data streaming.
 //
 // This handler:
-//   1. Upgrades the HTTP connection to WebSocket protocol
-//   2. Registers the client for broadcast updates
-//   3. Sends initial data snapshot to the client
-//   4. Handles client messages (currently just ping/pong for keepalive)
-//   5. Cleans up the connection when the client disconnects
+//  1. Upgrades the HTTP connection to WebSocket protocol
+//  2. Registers the client for broadcast updates
+//  3. Sends initial data snapshot to the client
+//  4. Handles client messages (currently just ping/pong for keepalive)
+//  5. Cleans up the connection when the client disconnects
 //
 // WebSocket clients receive periodic updates with current aircraft positions,
 // source status, and system statistics. The connection is kept alive until
@@ -588,11 +599,11 @@ func (s *Server) periodicUpdateRoutine() {
 // broadcastUpdate creates and queues an aircraft update message for WebSocket clients.
 //
 // This function:
-//   1. Collects current aircraft data from the merger
-//   2. Filters aircraft to only include "useful" ones (with position or callsign)
-//   3. Formats the data as a WebSocketMessage with type "aircraft_update"
-//   4. Converts ICAO addresses to hex strings for JSON compatibility
-//   5. Queues the message for broadcast (non-blocking)
+//  1. Collects current aircraft data from the merger
+//  2. Filters aircraft to only include "useful" ones (with position or callsign)
+//  3. Formats the data as a WebSocketMessage with type "aircraft_update"
+//  4. Converts ICAO addresses to hex strings for JSON compatibility
+//  5. Queues the message for broadcast (non-blocking)
 //
 // If the broadcast channel is full, the update is dropped to prevent blocking.
 // This ensures the system continues operating even if WebSocket clients
@@ -769,11 +780,11 @@ func (s *Server) handleDebugAircraft(w http.ResponseWriter, r *http.Request) {
 	}
 
 	response := map[string]interface{}{
-		"timestamp":        time.Now().Unix(),
-		"all_aircraft":     allAircraftMap,
+		"timestamp":         time.Now().Unix(),
+		"all_aircraft":      allAircraftMap,
 		"filtered_aircraft": filteredAircraftMap,
-		"all_count":        len(allAircraftMap),
-		"filtered_count":   len(filteredAircraftMap),
+		"all_count":         len(allAircraftMap),
+		"filtered_count":    len(filteredAircraftMap),
 	}
 
 	w.Header().Set("Content-Type", "application/json")

old.json

@@ -1,15 +0,0 @@
-{
-  "server": {
-    "address": ":8080",
-    "port": 8080
-  },
-  "dump1090": {
-    "host": "svovel",
-    "data_port": 30003
-  },
-  "origin": {
-    "latitude": 59.908127,
-    "longitude": 10.801460,
-    "name": "Etterstadsletta flyplass"
-  }
-}