Add a button for closing the connection in secure client example

Change-Id: Icc21315a5a20eeee02b578dc56459d4697a6361d
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

examples/coap/quicksecureclient/main.qml

@@ -64,8 +64,9 @@ Window {
     CoapSecureClient {
         id: client
         onFinished: {
-            outputView.text = result
-            statusLabel.text = ""
+            outputView.text = result;
+            statusLabel.text = "";
+            disconnectButton.enabled = true;
         }
     }
 
@@ -182,7 +183,6 @@ Window {
             id: requestButton
             text: qsTr("Send Request")
             enabled: securityModeGroup.checkState !== Qt.Unchecked
-            Layout.columnSpan: 2
 
             onClicked: {
                 outputView.text = "";
@@ -201,6 +201,19 @@ Window {
             }
         }
 
+        Button {
+            id: disconnectButton
+            text: qsTr("Disconnect")
+            enabled: false
+
+            onClicked: {
+                client.disconnect();
+                statusLabel.text = qsTr("Disconnected.");
+                outputView.text = "";
+                disconnectButton.enabled = false;
+            }
+        }
+
         TextArea {
             id: outputView
             placeholderText: qsTr("<Client Output>")

examples/coap/quicksecureclient/qmlcoapsecureclient.cpp

@@ -159,3 +159,9 @@ void QmlCoapSecureClient::setSecurityConfiguration(const QString &localCertifica
     }
     m_configuration = configuration;
 }
+
+void QmlCoapSecureClient::disconnect()
+{
+    if (m_coapClient)
+        m_coapClient->disconnect();
+}

examples/coap/quicksecureclient/qmlcoapsecureclient.h

@@ -68,6 +68,7 @@ public:
     Q_INVOKABLE void setSecurityConfiguration(const QString &localCertificatePath,
                                               const QString &caCertificatePath,
                                               const QString &privateKeyPath);
+    Q_INVOKABLE void disconnect();
 
 Q_SIGNALS:
     void finished(const QString &result);