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Results tagged with mqtt
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user 60266
MQTT (Message Queuing Telemetry Transport) is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol. The MQTT protocol enables a publish/subscribe messaging model in an extremely lightweight way. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.
0
votes
1
answer
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Convert JSON into string for MQTT
Update :
If I doclient.publish("/devices/data", data_json.c_str());, it gets compiled, but data doesn't appear in mqtt. …
- 113
1
vote
1
answer
5k
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publish json data to mqtt
I am trying to publish JSON data to mqtt with following code snippet
#include <Arduino_JSON.h>
JSONVar data;
data["temperature"] = temperature;
data["humidity"] = humidity;
data["pressure"] = pressure …
- 113
1
vote
2
answers
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esp32-cam publish image to mqtt
I want to publish image capture through ESP32-CAM to MQTT. … StringArray.h>
#include <PubSubClient.h>
#include <base64.h>
#include <libb64/cencode.h>
// Replace with your network credentials
const char* ssid = "####";
const char* password = "####";
// Add your MQTT …
- 113
1
vote
0
answers
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esp32 arduino wifi disconnect
<PubSubClient.h>
#include <Arduino_JSON.h>
#include <svm30.h>
// Replace the next variables with your SSID/Password combination
const char* ssid = "xxxx";
const char* password = "xxxx";
// Add your MQTT … client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("ESP32Client", mqtt_user, mqtt_password)) {
Serial.println("connected"); …
- 113