Invert TCP connection model: client listens, server connects

The XPL2 protocol specifies that the JI2 controller initiates connections
to the client, not the other way around. Xpl2Client now listens on 3 ports
via QTcpServer and accepts inbound connections; MockServer connects out
with auto-retry on the 1s KA_PING tick.

QML API: startListening/stopListening, listening+connected properties,
host property removed. Mock server gains --host CLI arg.

1 files changed, 16 insertions, 13 deletions

diff --git a/demo/Main.qml b/demo/Main.qml
index 9b9223f..6aca201 100644
--- a/demo/Main.qml
+++ b/demo/Main.qml
@@ -31,8 +31,9 @@ ApplicationWindow {
 
     Connections {
         function onConnectedChanged() {
-            debugConsole.appendLog(Xpl2Client.connected ? "Connected" :
-                                                          "Disconnected");
+            debugConsole.appendLog(Xpl2Client.connected
+                                   ? "Controller connected" :
+                                     "Controller disconnected");
         }
 
         function onErrorOccurred(error: string) {
@@ -43,6 +44,12 @@ ApplicationWindow {
             statusPage.lastJcStatus = status;
         }
 
+        function onListeningChanged() {
+            debugConsole.appendLog(Xpl2Client.listening
+                                   ? "Listening on ports 9110/9111/9112" :
+                                     "Stopped listening");
+        }
+
         function onPhStatusReceived(status) {
             statusPage.lastPhStatus = status;
         }
@@ -95,26 +102,22 @@ ApplicationWindow {
                 anchors.fill: parent
 
                 Label {
-                    text: "Host:"
+                    text: Xpl2Client.connected ? "Controller connected" :
+                                                 "Waiting for controller…"
                 }
 
-                TextField {
-                    id: hostField
-
+                Item {
                     Layout.fillWidth: true
-                    text: Xpl2Client.host
-
-                    onEditingFinished: Xpl2Client.host = text
                 }
 
                 Button {
-                    text: Xpl2Client.connected ? "Disconnect" : "Connect"
+                    text: Xpl2Client.listening ? "Stop" : "Listen"
 
                     onClicked: {
-                        if (Xpl2Client.connected)
-                        Xpl2Client.disconnectFromServer();
+                        if (Xpl2Client.listening)
+                        Xpl2Client.stopListening();
                         else
-                        Xpl2Client.connectToServer();
+                        Xpl2Client.startListening();
                     }
                 }
             }