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