clean up

internal/udp/connection.go

@@ -55,10 +55,6 @@ type Connection struct {
 	// Connection timing
 	lastPacketTime time.Time // Last received packet timestamp
 	lastAckTime    time.Time // Last acknowledgment timestamp
-
-	// Flow control
-	sendWindow  []bool // Sliding window for sent packets
-	windowStart uint16 // Start of the sliding window
 }
 
 // NewConnection creates a new connection instance with default settings
@@ -76,7 +72,6 @@ func NewConnection(addr *net.UDPAddr, conn *net.UDPConn, handler PacketHandler)
 		fragmentMgr:     NewFragmentManager(MaxPacketSize),
 		combiner:        NewPacketCombiner(),
 		outOfOrderMap:   make(map[uint16]*ProtocolPacket),
-		sendWindow:      make([]bool, DefaultWindowSize),
 	}
 }
 

internal/udp/packet.go

@@ -70,7 +70,7 @@ func (p *ProtocolPacket) Serialize() []byte {
 	var result []byte
 
 	// Handle variable opcode encoding
-	if p.Opcode >= 0xFF {
+	if p.Opcode == 0xFF {
 		// 2-byte opcode format: [0x00][actual_opcode][data]
 		result = make([]byte, 2+len(p.Data))
 		result[0] = 0x00