add mqtt control

src/mqttcontroller.cpp

@@ -0,0 +1,152 @@
+#include "mqttcontroller.h"
+#include "logger.h"
+
+#include <QMetaObject>
+
+#include <mosquitto.h>
+
+namespace {
+bool g_mqttInitialized = false;
+}
+
+MqttController::MqttController(const MqttConfig &configIn, QObject *parent)
+  : QObject(parent),
+    config(configIn)
+{
+  if (!g_mqttInitialized)
+  {
+    mosquitto_lib_init();
+    g_mqttInitialized = true;
+  }
+}
+
+MqttController::~MqttController()
+{
+  if (client)
+  {
+    mosquitto_disconnect(client);
+    mosquitto_loop_stop(client, true);
+    mosquitto_destroy(client);
+    client = nullptr;
+  }
+}
+
+void MqttController::start()
+{
+  if (!config.enabled)
+  {
+    Log("MQTT disabled or missing host/topic.");
+    return;
+  }
+
+  QString clientId = QString::fromStdString(config.clientId);
+  if (clientId.isEmpty())
+    clientId = "slide";
+
+  client = mosquitto_new(clientId.toUtf8().constData(), true, this);
+  if (!client)
+  {
+    Log("MQTT: failed to create client.");
+    return;
+  }
+
+  mosquitto_connect_callback_set(client, &MqttController::HandleConnect);
+  mosquitto_message_callback_set(client, &MqttController::HandleMessage);
+
+  if (!config.username.empty())
+  {
+    mosquitto_username_pw_set(client, config.username.c_str(),
+                              config.password.empty() ? nullptr : config.password.c_str());
+  }
+
+  mosquitto_reconnect_delay_set(client, 2, 30, true);
+
+  int rc = mosquitto_connect_async(client, config.host.c_str(), config.port, config.keepAlive);
+  if (rc != MOSQ_ERR_SUCCESS)
+  {
+    Log("MQTT connect failed: ", mosquitto_strerror(rc));
+    return;
+  }
+
+  rc = mosquitto_loop_start(client);
+  if (rc != MOSQ_ERR_SUCCESS)
+  {
+    Log("MQTT loop start failed: ", mosquitto_strerror(rc));
+    return;
+  }
+}
+
+void MqttController::HandleConnect(struct mosquitto *mosq, void *userdata, int rc)
+{
+  auto *self = static_cast<MqttController *>(userdata);
+  if (!self || !mosq)
+    return;
+  if (rc != 0)
+  {
+    Log("MQTT connect error: ", mosquitto_strerror(rc));
+    return;
+  }
+  self->connected = true;
+  self->subscribe();
+}
+
+void MqttController::subscribe()
+{
+  if (!client || !connected)
+    return;
+  int rc = mosquitto_subscribe(client, nullptr, config.topic.c_str(), config.qos);
+  if (rc != MOSQ_ERR_SUCCESS)
+  {
+    Log("MQTT subscribe failed: ", mosquitto_strerror(rc));
+  }
+  else
+  {
+    Log("MQTT subscribed to ", config.topic);
+  }
+}
+
+void MqttController::HandleMessage(struct mosquitto *mosq, void *userdata, const struct mosquitto_message *message)
+{
+  Q_UNUSED(mosq);
+  auto *self = static_cast<MqttController *>(userdata);
+  if (!self || !message || !message->payload)
+    return;
+
+  QString payload = QString::fromUtf8(static_cast<const char *>(message->payload), message->payloadlen);
+  QMetaObject::invokeMethod(self, "handleCommand", Qt::QueuedConnection, Q_ARG(QString, payload));
+}
+
+void MqttController::handleCommand(const QString &payload)
+{
+  QString cmd = payload.trimmed().toLower();
+  if (cmd.isEmpty())
+    return;
+
+  if (cmd == "play" || cmd == "resume")
+  {
+    emit play();
+    return;
+  }
+  if (cmd == "pause")
+  {
+    emit pause();
+    return;
+  }
+  if (cmd == "next" || cmd == "skip" || cmd == "next-image")
+  {
+    emit nextImage();
+    return;
+  }
+  if (cmd == "next-folder" || cmd == "folder-next" || cmd == "skip-folder")
+  {
+    emit nextFolder();
+    return;
+  }
+  if (cmd == "restart" || cmd == "reset")
+  {
+    emit restart();
+    return;
+  }
+
+  Log("MQTT unknown command: ", cmd.toStdString());
+}