Silence some queued signal warnings

src/comm/SerialLink.cc

@@ -26,6 +26,9 @@ SerialLink::SerialLink(QString portname, int baudRate, bool hardwareFlowControl,
     m_stopp(false),
     m_reqReset(false)
 {
+    // We use QSerialPort::SerialPortError in a signal so we must declare it as a meta type
+    static int idMetaType = qRegisterMetaType<QSerialPort::SerialPortError>();
+    Q_UNUSED(idMetaType);
 
     // Get the name of the current port in use.
     m_portName = portname.trimmed();
@@ -445,7 +448,9 @@ bool SerialLink::hardwareConnect()
 
 void SerialLink::linkError(QSerialPort::SerialPortError error)
 {
-    qDebug() << error;
+    if (error != QSerialPort::NoError) {
+        qDebug() << "SerialLink::linkError" << error;
+    }
 }
 
 

src/comm/SerialLink.h

@@ -36,10 +36,14 @@ This file is part of the QGROUNDCONTROL project
 #include <QThread>
 #include <QMutex>
 #include <QString>
-#include <qserialport.h>
 #include <configuration.h>
 #include "SerialLinkInterface.h"
 
+// We use QSerialPort::SerialPortError in a signal so we must declare it as a meta type
+#include <qserialport.h>
+#include <QMetaType>
+Q_DECLARE_METATYPE(QSerialPort::SerialPortError)
+
 /**
  * @brief The SerialLink class provides cross-platform access to serial links.
  * It takes care of the link management and provides a common API to higher

src/comm/TCPLink.cc

@@ -43,6 +43,12 @@ TCPLink::TCPLink(QHostAddress hostAddress, quint16 socketPort) :
     _socket(NULL),
     _socketIsConnected(false)
 {
+    // Even though QAbstractSocket::SocketError is used in a signal by Qt, Qt doesn't declare it as a meta type.
+    // This in turn causes debug output to be kicked out about not being able to queue the signal. We register it
+    // as a meta type to silence that.
+    static int idMetaType = qRegisterMetaType<QAbstractSocket::SocketError>();
+    Q_UNUSED(idMetaType);
+    
     _linkId = getNextLinkId();
     _resetName();
     

src/comm/TCPLink.h

@@ -34,10 +34,16 @@
 #include <QMap>
 #include <QMutex>
 #include <QHostAddress>
-#include <QTcpSocket>
 #include <LinkInterface.h>
 #include <configuration.h>
 
+// Even though QAbstractSocket::SocketError is used in a signal by Qt, Qt doesn't declare it as a meta type.
+// This in turn causes debug output to be kicked out about not being able to queue the signal. We declare it
+// as a meta type to silence that.
+#include <QMetaType>
+#include <QTcpSocket>
+Q_DECLARE_METATYPE(QAbstractSocket::SocketError)
+
 //#define TCPLINK_READWRITE_DEBUG   // Use to debug data reads/writes
 
 class TCPLink : public LinkInterface