tp3

README.md

@@ -182,3 +182,4 @@ Un KPI doit être :
 - [TD 1](td1.md)
 - [TP 1](tp1.md)
 - [TP 2](tp2.md)
+- [TP 3](tp3.md)

tp3.md

@@ -0,0 +1,49 @@
+# TP3 : NodeRed
+
+```shell
+docker run --detach --name nodered ^
+  --network tp_net ^
+  -p "1880:1880" ^
+  -v nodered:/data ^
+  -e "TZ=Europe/Paris" ^
+  nodered/node-red:4.1
+```
+
+Ajouter la bibliothèque MQTT
+
+```c
+#include <curl/curl.h>
+#include <string>
+#include <iostream>
+
+#include <thread>
+#include <atomic>
+#include <queue>
+#include <mutex>
+#include <condition_variable>
+#include <csignal>
+#include <chrono>
+#include <cstring>
+#undef timeout
+#include "mqtt/async_client.h"
+
+#include <nlohmann/json.hpp>
+```
+
+Dans la fonction ProcessMQTT créer un objet JSON avec les valeurs des différents capteurs.
+
+```c
+json obj = {
+  {"entree", _digital[IN_FLOW_IN].dvalue},
+  {"sortie", _digital[IN_FLOW_OUT].dvalue}
+};
+```
+
+Envoyer le message
+
+```c
+std::string payload = obj.dump();
+auto msg = mqtt::make_message("geii/telemetry", payload);
+msg->set_qos(1);
+client->publish(msg);
+```