3 files changed, 71 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bcb1f62..e49cf1b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,4 +27,5 @@ add_subdirectory(src)
 
 if(PROJECT_IS_TOP_LEVEL)
   add_subdirectory(demo)
+  add_subdirectory(mock-server)
 endif()
diff --git a/mock-server/CMakeLists.txt b/mock-server/CMakeLists.txt
new file mode 100644
index 0000000..52bfabb
--- /dev/null
+++ b/mock-server/CMakeLists.txt
@@ -0,0 +1,6 @@
+qt_add_executable(Xpl2MockServer main.cpp)
+
+set_target_properties(Xpl2MockServer PROPERTIES RUNTIME_OUTPUT_DIRECTORY
+                                                "${PROJECT_BINARY_DIR}/bin")
+
+target_link_libraries(Xpl2MockServer PRIVATE Qt6::Core Qt6::Network)
diff --git a/mock-server/main.cpp b/mock-server/main.cpp
new file mode 100644
index 0000000..4818d6f
--- /dev/null
+++ b/mock-server/main.cpp
@@ -0,0 +1,64 @@
+/**
+ * @file   main.cpp
+ * @brief  Mock XPL2 server — echoes back on three ports.
+ */
+#include <QCoreApplication>
+#include <QTcpServer>
+#include <QTcpSocket>
+
+static QTcpServer *
+listenOn (quint16 port, const char *name, QObject *parent)
+{
+  auto *server = new QTcpServer (parent);
+
+  QObject::connect (
+      server, &QTcpServer::newConnection, server,
+      [=] ()
+        {
+          while (auto *sock = server->nextPendingConnection ())
+            {
+              qInfo ("[%s:%d] client connected", name, port);
+
+              QObject::connect (sock, &QTcpSocket::readyRead, sock,
+                                [=] ()
+                                  {
+                                    QByteArray data = sock->readAll ();
+                                    qInfo ("[%s:%d] echo %lld bytes", name,
+                                           port, data.size ());
+                                    sock->write (data);
+                                  });
+
+              QObject::connect (sock, &QTcpSocket::disconnected, sock,
+                                [=] ()
+                                  {
+                                    qInfo ("[%s:%d] client disconnected", name,
+                                           port);
+                                    sock->deleteLater ();
+                                  });
+            }
+        });
+
+  if (!server->listen (QHostAddress::Any, port))
+    {
+      qCritical ("Failed to listen on %s port %d: %s", name, port,
+                 qPrintable (server->errorString ()));
+    }
+  else
+    {
+      qInfo ("Listening on %s port %d", name, port);
+    }
+
+  return server;
+}
+
+int
+main (int argc, char *argv[])
+{
+  QCoreApplication app (argc, argv);
+
+  listenOn (9110, "Command", &app);
+  listenOn (9111, "Imaging", &app);
+  listenOn (9112, "Status", &app);
+
+  return app.exec ();
+}