Automatisation IoT avec n8n : surveillance de capteurs à distance

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        "content": "MQTT trigger subscribed to a topic called wokwi-weather via a Mosquitto MQTT broker. The trigger receives the temperature and humidity payloads from a DHT22 sensor connected to a remote ESP32 microcontroller "
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        "jsCode": "// Try to parse the incoming message as JSON\nlet data;\ntry {\n  data = JSON.parse($json.message); // $json.message is expected to be a JSON string\n} catch (e) {\n  // If parsing fails, throw an error\n  throw new Error(\"Invalid JSON in MQTT message\");\n}\n\n// Get the topic from the input, or use a default value\nconst topic = $json.topic || \"unknown-topic\";\n\n// Make sure humidity and temp are numbers\nif (typeof data.humidity !== \"number\" || typeof data.temp !== \"number\") {\n  throw new Error(\"Missing or invalid humidity/temp in MQTT message\");\n}\n\n// Create a formatted string like: \"topic_name humidity=45,temp=22\"\nconst line = `${topic} humidity=${data.humidity},temp=${data.temp}`;\n\n// Return the result in the expected format\nreturn [\n  {\n    json: {\n      payload: line\n    }\n  }\n];"
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