feat: implement real ping RTT calculation instead of hardcoded 50ms

internal/client/client.go

@@ -37,6 +37,12 @@ type Client struct {
 	PongPacketID       uint16 // Type 0x05
 	AckPacketID        uint16 // Type 0x06
 
+	// Ping RTT tracking
+	PingSentTimes   map[uint16]time.Time // Map PingPacketID -> Time sent
+	PingRTT         float64              // Rolling average RTT in ms
+	PingDeviation   float64              // Rolling deviation in ms
+	PingSampleCount int                  // Number of samples for rolling avg
+
 	// State
 	Connected  bool
 	ServerName string
@@ -70,6 +76,9 @@ func NewClient(nickname string) *Client {
 		VoiceDecoders:      make(map[uint16]*opus.Decoder),
 		CommandQueue:       make(map[uint16]*protocol.Packet),
 		ExpectedCommandPID: 0,
+		PingSentTimes:      make(map[uint16]time.Time),
+		PingRTT:            0,
+		PingDeviation:      0,
 		done:               make(chan struct{}),
 	}
 }
@@ -187,6 +196,9 @@ func (c *Client) sendPing() error {
 	pkt.Data = encData
 	copy(pkt.Header.MAC[:], mac)
 
+	// Record send time for RTT calculation
+	c.PingSentTimes[pkt.Header.PacketID] = time.Now()
+
 	log.Printf("Sending proper Encrypted Ping (PID=%d)", pkt.Header.PacketID)
 	return c.Conn.SendPacket(pkt)
 }

internal/client/commands.go

@@ -459,11 +459,20 @@ func (c *Client) processCommand(data []byte, pkt *protocol.Packet) error {
 
 		case "notifyconnectioninforequest":
 			// Server asking for connection info. We MUST reply to update Ping in UI and avoid timeout.
-			log.Println("Server requested connection info. sending 'setconnectioninfo'...")
+			log.Println("Server requested connection info. Sending 'setconnectioninfo'...")
 
 			cmd := protocol.NewCommand("setconnectioninfo")
-			cmd.AddParam("connection_ping", "50")
-			cmd.AddParam("connection_ping_deviation", "5")
+
+			// Use real ping values if available, otherwise default to 50ms
+			pingMs := c.PingRTT
+			pingDev := c.PingDeviation
+			if pingMs == 0 {
+				pingMs = 50.0 // Default before first measurement
+				pingDev = 5.0
+			}
+
+			cmd.AddParam("connection_ping", fmt.Sprintf("%.4f", pingMs))
+			cmd.AddParam("connection_ping_deviation", fmt.Sprintf("%.4f", pingDev))
 
 			// Detailed stats for each kind as seen in ts3j (KEEPALIVE, SPEECH, CONTROL)
 			kinds := []string{"keepalive", "speech", "control"}

internal/client/packet.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"encoding/binary"
 	"log"
+	"math"
+	"time"
 
 	"go-ts/pkg/protocol"
 )
@@ -114,8 +116,59 @@ func (c *Client) handlePacket(pkt *protocol.Packet) error {
 
 		c.Conn.SendPacket(pong)
 	case protocol.PacketTypePong:
-		// Server acknowledged our Ping
-		log.Printf("Received Pong for sequence %d", pkt.Header.PacketID)
+		// Server acknowledged our Ping - calculate RTT
+		receivedAt := time.Now()
+
+		// Decrypt Pong body if needed to get the PingID it's acknowledging
+		var pongData []byte
+		if pkt.Header.FlagUnencrypted() {
+			pongData = pkt.Data
+		} else if c.Handshake != nil && c.Handshake.Step >= 6 && len(c.Handshake.SharedIV) > 0 {
+			crypto := &protocol.CryptoState{
+				SharedIV:     c.Handshake.SharedIV,
+				SharedMac:    c.Handshake.SharedMac,
+				GenerationID: 0,
+			}
+			key, nonce := crypto.GenerateKeyNonce(&pkt.Header, false) // Server->Client
+			meta := make([]byte, 3)
+			binary.BigEndian.PutUint16(meta[0:2], pkt.Header.PacketID)
+			meta[2] = pkt.Header.Type
+			decrypted, err := protocol.DecryptEAX(key, nonce, meta, pkt.Data, pkt.Header.MAC[:])
+			if err == nil {
+				pongData = decrypted
+			}
+		}
+
+		// Extract PingID from Pong body
+		var pingID uint16
+		if len(pongData) >= 2 {
+			pingID = binary.BigEndian.Uint16(pongData[0:2])
+		} else {
+			pingID = pkt.Header.PacketID // fallback
+		}
+
+		// Calculate RTT if we have the send time
+		if sentTime, ok := c.PingSentTimes[pingID]; ok {
+			rtt := receivedAt.Sub(sentTime).Seconds() * 1000 // RTT in ms
+			delete(c.PingSentTimes, pingID)
+
+			// Update rolling average using Welford's algorithm
+			c.PingSampleCount++
+			if c.PingSampleCount == 1 {
+				c.PingRTT = rtt
+				c.PingDeviation = 0
+			} else {
+				oldMean := c.PingRTT
+				c.PingRTT = oldMean + (rtt-oldMean)/float64(c.PingSampleCount)
+				// Rolling deviation: exponential smoothing
+				c.PingDeviation = c.PingDeviation*0.9 + math.Abs(rtt-c.PingRTT)*0.1
+			}
+
+			log.Printf("Received Pong for Ping %d: RTT=%.2fms, AvgRTT=%.2fms, Dev=%.2fms",
+				pingID, rtt, c.PingRTT, c.PingDeviation)
+		} else {
+			log.Printf("Received Pong for unknown Ping %d", pingID)
+		}
 	case protocol.PacketTypeAck:
 		// Server acknowledged our packet
 		var data []byte