tp3

tp3.md

@@ -39,7 +39,7 @@ docker run --detach --name rabbitmq \
   --network proxy_net \
   -p "5672:5672" -p "1883:1883" \
   -e "PRABBITMQ_DEFAULT_USER=admin" \
-  -e "RABBITMQ_DEFAULT_PASS=ChangeMe" \
+  -e "RABBITMQ_DEFAULT_PASS=geii2025" \
   -e "RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS=-rabbitmq_mqtt tcp_listeners [1883]" \
   -v rabbitmq_data:/var/lib/rabbitmq \
   -l "caddy=rabbitmq.localhost" \
@@ -49,6 +49,8 @@ docker run --detach --name rabbitmq \
   sh -c "rabbitmq-plugins enable --offline rabbitmq_mqtt rabbitmq_management && rabbitmq-server"
 ```
 
+Ajouter la bibliothèque Dashboard2
+
 ## Programme C
 
 Ajouter la bibliothèque MQTT
@@ -72,6 +74,49 @@ Ajouter la bibliothèque MQTT
 #include <nlohmann/json.hpp>
 ```
 
+Déclarer les constantes
+
+```c
+/* Configuration MQTT */
+const std::string ADDRESS = "tcp://rabbitmq:1883";
+const std::string CLIENTID = "CppClientTP";
+const std::string TOPIC = "geii/ordre/#";
+const int QOS = 1;
+const int CYCLE_MS = 100;
+```
+
+
+Écrire la fonction qui va traiter l'arrivée des messages
+
+```c
+class callback : public virtual mqtt::callback {
+public:
+  void message_arrived(mqtt::const_message_ptr msg) override {
+    std::string payload = msg->to_string();
+    //... Effectuer les actions en conséquences
+  }
+};
+```
+
+```c
+mqtt::async_client client(ADDRESS, CLIENTID);
+  callback cb;
+  client.set_callback(cb);
+
+  mqtt::connect_options connOpts;
+  connOpts.set_clean_session(true);
+  connOpts.set_user_name("admin");
+  connOpts.set_password("geii2025");
+  try {
+    client.connect(connOpts)->wait();
+    client.start_consuming();
+    client.subscribe(TOPIC, QOS)->wait();
+  } catch (const mqtt::exception &exc) {
+    std::cerr << "Erreur MQTT: " << exc.what() << "\n";
+    return 1;
+  }
+```
+
 Dans la fonction ProcessMQTT créer un objet JSON avec les valeurs des différents capteurs.
 
 ```c
@@ -89,3 +134,15 @@ auto msg = mqtt::make_message("geii/telemetry", payload);
 msg->set_qos(1);
 client->publish(msg);
 ```
+
+Après la boucle principale déconnecter MQTT.
+
+```c
+try {
+  client.unsubscribe(TOPIC)->wait();
+  client.stop_consuming();
+  client.disconnect()->wait();
+} catch(const mqtt::exception &exc){
+  std::cerr << "Erreur déconnexion MQTT: " << exc.what() << "\n";
+}
+```