add mqtt control

src/appconfig.h

@@ -49,6 +49,36 @@ struct ImmichConfig {
   }
 };
 
+struct MqttConfig {
+  bool enabled = false;
+  std::string host = "localhost";
+  int port = 1883;
+  std::string topic = "slide/control";
+  std::string clientId = "slide";
+  std::string username = "";
+  std::string password = "";
+  int keepAlive = 30;
+  int qos = 0;
+
+  bool operator==(const MqttConfig &b) const
+  {
+    return enabled == b.enabled &&
+           host == b.host &&
+           port == b.port &&
+           topic == b.topic &&
+           clientId == b.clientId &&
+           username == b.username &&
+           password == b.password &&
+           keepAlive == b.keepAlive &&
+           qos == b.qos;
+  }
+
+  bool operator!=(const MqttConfig &b) const
+  {
+    return !operator==(b);
+  }
+};
+
 // configuration options that apply to an image/folder of images
 struct Config {
   public:
@@ -106,6 +136,7 @@ struct AppConfig : public Config {
     std::string overlay = "";
     QString overlayHexRGB = "#FFFFFF";
     QVector<PathEntry> paths;
+    MqttConfig mqtt;
 
     bool debugMode = false;