[{"data":1,"prerenderedAt":4756},["ShallowReactive",2],{"docs-\u002Fdocs\u002Fnode-red\u002Fperipheral\u002Fesp32\u002F":3,"featureCatalog":3306,"docs-nav":3709},{"id":4,"title":5,"body":6,"description":16,"editUrl":3297,"extension":3298,"layout":3299,"meta":3300,"metaTitle":5,"navGroup":3299,"navGroupOrder":3299,"navOrder":3213,"navTitle":807,"navigation":2940,"originalPath":3299,"path":3301,"redirect":3299,"seo":3302,"stem":3303,"updated":3304,"version":3299,"__hash__":3305},"docs\u002Fdocs\u002Fnode-red\u002Fperipheral\u002Fesp32.md","Connect ESP32 with Node-RED using MQTT",{"type":7,"value":8,"toc":3286},"minimark",[9,13,17,22,54,58,65,68,72,159,163,166,183,186,190,197,204,209,221,2910,2914,2917,3267,3271,3282],[10,11,5],"h1",{"id":12},"connect-esp32-with-node-red-using-mqtt",[14,15,16],"p",{},"This document outlines the procedure for establishing MQTT communication between an ESP32 microcontroller and a Node-RED instance.",[18,19,21],"h2",{"id":20},"requirements","Requirements",[23,24,25,29,32,44,51],"ul",{},[26,27,28],"li",{},"An ESP32 development board.",[26,30,31],{},"An active MQTT broker with access credentials.",[26,33,34,35,43],{},"A running Node-RED instance. The quickest way to get started is with ",[36,37,38],"strong",{},[39,40,42],"a",{"href":41},"\u002F","FlowFuse",", which allows you to effortlessly deploy and manage Node-RED instances and also includes a built-in MQTT broker service.",[26,45,46,47,50],{},"Arduino IDE configured with the ESP32 core and the ",[36,48,49],{},"PubSubClient"," library installed.",[26,52,53],{},"Two MQTT clients configured",[18,55,57],{"id":56},"set-up-mqtt-clients","Set Up MQTT Clients",[14,59,60,61],{},"To create the necessary MQTT clients (one for ESP32 and one for Node-RED), follow the official guide: ",[39,62,64],{"href":63},"\u002Fdocs\u002Fcloud\u002Fintroduction\u002F#enterprise-team-broker","Creating MQTT Clients in FlowFuse",[14,66,67],{},"Once created, note down the client ID, username, and password for each client. These credentials will be used later to establish communication.",[18,69,71],{"id":70},"node-red-configuration","Node-RED Configuration",[73,74,75,78,94,137,152],"ol",{},[26,76,77],{},"Open your Node-RED editor.",[26,79,80,81,87,88,93],{},"Drag either an ",[36,82,83],{},[84,85,86],"code",{},"mqtt in"," node (to receive data from ESP32) or an ",[36,89,90],{},[84,91,92],{},"mqtt out"," node (to send commands to ESP32) into your flow.",[26,95,96,97],{},"Double-click the node and configure the MQTT connection:\n",[23,98,99,109,123],{},[26,100,101,104,105,108],{},[36,102,103],{},"Server",": Your MQTT broker’s address (e.g., ",[84,106,107],{},"broker.flowfuse.cloud",")",[26,110,111,114,115,118,119,122],{},[36,112,113],{},"Port",": Typically ",[84,116,117],{},"1883"," or ",[84,120,121],{},"8883"," for TLS",[26,124,125,128,129,132,133,136],{},[36,126,127],{},"Client ID",", ",[36,130,131],{},"Username",", and ",[36,134,135],{},"Password",": Use the credentials created for the Node-RED client in your broker",[26,138,139,140,143,144,147,148,151],{},"Specify a ",[36,141,142],{},"Topic"," such as ",[84,145,146],{},"\u002Fesp32\u002Fcontrol"," for sending commands or ",[84,149,150],{},"\u002Fesp32\u002Fdata"," for receiving sensor data.",[26,153,154,155,158],{},"Click ",[36,156,157],{},"Deploy",". Once configured properly, the MQTT node should display a “connected” status.",[18,160,162],{"id":161},"esp32-programming","ESP32 Programming",[14,164,165],{},"The ESP32 firmware must perform the following actions:",[73,167,168,171,174,180],{},[26,169,170],{},"Establish a connection to the local Wi-Fi network.",[26,172,173],{},"Connect to the MQTT broker using its designated client credentials.",[26,175,176,177,179],{},"Subscribe to the topic specified in Node-RED (",[84,178,146],{},").",[26,181,182],{},"Implement a callback function to process received messages and execute corresponding actions.",[14,184,185],{},"Make sure to program the ESP32 accordingly using the Arduino IDE and the PubSubClient library to ensure reliable communication with the MQTT broker.",[18,187,189],{"id":188},"live-demo-remote-led-control","Live Demo: Remote LED Control",[191,192],"lite-youtube",{"videoid":193,"params":194,"style":195,"title":196},"ecfJ-9MxyVE","rel=0","margin-top: 20px; margin-bottom: 20px; width: 100%; height: 480px;","YouTube video player",[14,198,199,200],{},"This section provides a practical demonstration with an importable Node-RED flow and corresponding ESP32 code to remotely control the onboard LED. For more detailed, practical steps, please refer to our article ",[39,201,203],{"href":202},"\u002Fblog\u002F2024\u002F11\u002Fesp32-with-node-red\u002F","Interacting with ESP32 Using Node-RED and MQTT",[205,206,208],"h3",{"id":207},"_1-node-red-demo-flow","1. Node-RED Demo Flow",[14,210,211,212,215,216,220],{},"Import the following JSON into your Node-RED editor. This flow creates a simple dashboard with ON\u002FOFF buttons that publish to the ",[84,213,214],{},"\u002Fesp32\u002Fled"," topic. You must configure the ",[36,217,218],{},[84,219,92],{}," node with your specific broker credentials.",[222,223,225],"render-flow",{":height":224},"300",[226,227,232],"pre",{"className":228,"code":229,"language":230,"meta":231,"style":231},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","[{\"id\":\"59887a8115c95eae\",\"type\":\"tab\",\"label\":\"Flow 1\",\"disabled\":false,\"info\":\"\",\"env\":[]},{\"id\":\"02c25e8a30f9379d\",\"type\":\"ui-base\",\"name\":\"My Dashboard\",\"path\":\"\u002Fdashboard\",\"appIcon\":\"\",\"includeClientData\":true,\"acceptsClientConfig\":[\"ui-notification\",\"ui-control\"],\"showPathInSidebar\":false,\"showPageTitle\":true,\"navigationStyle\":\"default\",\"titleBarStyle\":\"default\"},{\"id\":\"cfb2ab9ff30660fc\",\"type\":\"ui-theme\",\"name\":\"Default 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ESP32 Demo Code",[14,2915,2916],{},"The following code should be uploaded to your ESP32 board. Replace the placeholder values with your specific network and MQTT credentials.",[226,2918,2922],{"className":2919,"code":2920,"language":2921,"meta":231,"style":231},"language-cpp shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","#include \u003CWiFi.h>\n#include \u003CPubSubClient.h>\n\n\u002F\u002F --- User-defined Credentials ---\nconst char* ssid = \"YOUR_WIFI_SSID\";\nconst char* password = \"YOUR_WIFI_PASSWORD\";\nconst char* mqtt_server = \"YOUR_MQTT_BROKER_IP\"; \u002F\u002F e.g., \"192.168.1.100\"\nconst char* mqtt_user = \"YOUR_MQTT_USERNAME\";\nconst char* mqtt_pass = \"YOUR_MQTT_PASSWORD\";\n\n\u002F\u002F --- Pin Definitions ---\n#define LED_PIN 2 \u002F\u002F Onboard LED pin\n\n\u002F\u002F --- Global Objects ---\nWiFiClient espClient;\nPubSubClient client(espClient);\n\n\u002F\u002F --- MQTT Message Handler ---\nvoid callback(char* topic, byte* payload, unsigned int length) {\n  String message;\n  for (int i = 0; i \u003C length; i++) {\n    message += (char)payload[i];\n  }\n\n  if (String(topic) == \"\u002Fesp32\u002Fled\") {\n    if (message == \"ON\") {\n      digitalWrite(LED_PIN, HIGH);\n    } else if (message == \"OFF\") {\n      digitalWrite(LED_PIN, LOW);\n    }\n  }\n}\n\n\u002F\u002F --- MQTT Reconnection Logic ---\nvoid reconnect() {\n  while (!client.connected()) {\n    if (client.connect(\"esp32-client-demo\", mqtt_user, mqtt_pass)) {\n      client.subscribe(\"\u002Fesp32\u002Fled\");\n    } else {\n      delay(5000); 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