Added knock response and error message for server secret collisions.

knock.go

@@ -32,6 +32,8 @@ const (
 	KNOCK_FAIL uint = 0xE1
 	// KNOCK_BUSY is the knock sequence response code indicating busy connection.
 	KNOCK_BUSY uint = 0xE2
+	// KNOCK_IN_USE is the knock sequence response code indicating busy connection.
+	KNOCK_IN_USE uint = 0xE3
 )
 
 var (
@@ -77,6 +79,8 @@ func (qs *QSocket) SendKnockSequence() error {
 		return ErrSocketBusy
 	case byte(KNOCK_FAIL):
 		return ErrConnRefused
+	case byte(KNOCK_IN_USE):
+		return ErrAddressInUse
 	default:
 		return ErrInvalidKnockResponse
 	}

qsock.go

@@ -72,13 +72,14 @@ const (
 var (
 	ErrUntrustedCert       = errors.New("certificate fingerprint mismatch")
 	ErrUninitializedSocket = errors.New("socket not initiated")
-	ErrQSocketSessionEnd   = errors.New("qSocket session has ended")
+	ErrQSocketSessionEnd   = errors.New("QSocket session has ended")
 	ErrUnexpectedSocket    = errors.New("unexpected socket type")
 	ErrInvalidIdTag        = errors.New("invalid peer ID tag")
 	ErrNoTlsConnection     = errors.New("TLS socket is nil")
 	ErrSocketNotConnected  = errors.New("socket is not connected")
 	ErrSrpFailed           = errors.New("SRP auth failed")
 	ErrSocketInUse         = errors.New("socket already dialed")
+	ErrAddressInUse        = errors.New("address already in use")
 )
 
 // A QSocket structure contains required values