Check if the IPv6 to v4 conversion succeeds, use v6 if it doesn't.

core/backends/lan/landevicelink.cpp

@@ -56,13 +56,27 @@ void LanDeviceLink::reset(QSslSocket* socket, ConnectionStarted connectionSource
 
     mConnectionSource = connectionSource;
 
-    QHostAddress addr = socket->peerAddress();
-    mHostAddress = (addr.protocol() == QAbstractSocket::IPv6Protocol) ? QHostAddress(addr.toIPv4Address()) : addr;
-
     QString certString = KdeConnectConfig::instance()->getDeviceProperty(deviceId(), QStringLiteral("certificate"));
     DeviceLink::setPairStatus(certString.isEmpty()? PairStatus::NotPaired : PairStatus::Paired);
 }
 
+QHostAddress LanDeviceLink::hostAddress() const
+{
+    if (!mSocketLineReader) {
+        return QHostAddress::Null;
+    }
+    QHostAddress addr = mSocketLineReader->mSocket->peerAddress();
+    if (addr.protocol() == QAbstractSocket::IPv6Protocol) {
+        bool success;
+        QHostAddress convertedAddr = QHostAddress(addr.toIPv4Address(&success));
+        if (success) {
+            qCDebug(KDECONNECT_CORE) << "Converting IPv6" << addr << "to IPv4" << convertedAddr;
+            addr = convertedAddr;
+        }
+    }
+    return addr;
+}
+
 QString LanDeviceLink::name()
 {
     return QStringLiteral("LanLink"); // Should be same in both android and kde version

core/backends/lan/landevicelink.h

@@ -54,7 +54,7 @@ public:
 
     bool linkShouldBeKeptAlive() override;
 
-    QHostAddress hostAddress() const { return mHostAddress; }
+    QHostAddress hostAddress() const;
 
 private Q_SLOTS:
     void dataReceived();