Fix compilation

- Some compilers don't like using QPointer in connect(). Use
  QPointer::data() instead. This fixes the build for linux SLES 12.

- Enable simplecoapclient example only when Qt is compiled with gui.

Fixes: QTBUG-78884
Change-Id: I592e52eaea93f8f94a2b1af18ea29e745c44dde9
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

3 files changed, 12 insertions, 10 deletions

diff --git a/examples/coap/coap.pro b/examples/coap/coap.pro
index 006c281..befe3b7 100644
--- a/examples/coap/coap.pro
+++ b/examples/coap/coap.pro
@@ -1,8 +1,8 @@
 TEMPLATE = subdirs
 
-SUBDIRS += \
-    simplecoapclient \
-    consolecoapclient
+SUBDIRS += consolecoapclient
+
+qtHaveModule(gui) SUBDIRS += simplecoapclient
 
 qtHaveModule(quick) {
     SUBDIRS += \
diff --git a/src/coap/qcoapprotocol.cpp b/src/coap/qcoapprotocol.cpp
index 42ef4ba..9d365c6 100644
--- a/src/coap/qcoapprotocol.cpp
+++ b/src/coap/qcoapprotocol.cpp
@@ -139,14 +139,14 @@ void QCoapProtocol::sendRequest(QPointer<QCoapReply> reply, QCoapConnection *con
             || !QCoapRequestPrivate::isUrlValid(reply->request().url()))
         return;
 
-    connect(reply, &QCoapReply::aborted, this, [this](const QCoapToken &token) {
+    connect(reply.data(), &QCoapReply::aborted, this, [this](const QCoapToken &token) {
         Q_D(QCoapProtocol);
         d->onRequestAborted(token);
     });
 
     auto internalRequest = QSharedPointer<QCoapInternalRequest>::create(reply->request(), this);
     internalRequest->setMaxTransmissionWait(maximumTransmitWait());
-    connect(reply, &QCoapReply::finished, this, &QCoapProtocol::finished);
+    connect(reply.data(), &QCoapReply::finished, this, &QCoapProtocol::finished);
 
     if (internalRequest->isMulticast()) {
         connect(internalRequest.data(), &QCoapInternalRequest::multicastRequestExpired, this,
diff --git a/src/coap/qcoapqudpconnection.cpp b/src/coap/qcoapqudpconnection.cpp
index ebb3fa9..41224a2 100644
--- a/src/coap/qcoapqudpconnection.cpp
+++ b/src/coap/qcoapqudpconnection.cpp
@@ -113,15 +113,17 @@ QCoapQUdpConnection::QCoapQUdpConnection(QCoapQUdpConnectionPrivate &dd, QObject
             configuration.setPeerVerifyMode(QSslSocket::VerifyNone);
             d->dtls->setDtlsConfiguration(configuration);
 
-            connect(d->dtls, &QDtls::pskRequired, this, &QCoapQUdpConnection::pskRequired);
-            connect(d->dtls, &QDtls::handshakeTimeout, this, &QCoapQUdpConnection::handshakeTimeout);
+            connect(d->dtls.data(), &QDtls::pskRequired, this, &QCoapQUdpConnection::pskRequired);
+            connect(d->dtls.data(), &QDtls::handshakeTimeout,
+                    this, &QCoapQUdpConnection::handshakeTimeout);
             break;
         case QtCoap::SecurityMode::Certificate:
             d->dtls = new QDtls(QSslSocket::SslClientMode, this);
             configuration.setPeerVerifyMode(QSslSocket::VerifyPeer);
             d->dtls->setDtlsConfiguration(configuration);
 
-            connect(d->dtls, &QDtls::handshakeTimeout, this, &QCoapQUdpConnection::handshakeTimeout);
+            connect(d->dtls.data(), &QDtls::handshakeTimeout,
+                    this, &QCoapQUdpConnection::handshakeTimeout);
             break;
         default:
             break;
@@ -145,11 +147,11 @@ void QCoapQUdpConnection::createSocket()
 
     d->udpSocket = new QUdpSocket(this);
 
-    connect(d->udpSocket, &QUdpSocket::readyRead, [this]() {
+    connect(d->udpSocket.data(), &QUdpSocket::readyRead, [this]() {
         Q_D(QCoapQUdpConnection);
         d->socketReadyRead();
     });
-    connect(d->udpSocket, QOverload<QAbstractSocket::SocketError>::of(&QUdpSocket::error),
+    connect(d->udpSocket.data(), QOverload<QAbstractSocket::SocketError>::of(&QUdpSocket::error),
             [this](QAbstractSocket::SocketError socketError) {
                     qCWarning(lcCoapConnection) << "CoAP UDP socket error" << socketError
                                                 << socket()->errorString();