ESP32

In this article we are connecting an ESP32 to Nimbus808 solution platform using MQTT.

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Learn how to set up the ESP32 using WiFi and how to send/receive data over Nimbus808

The Wio Terminal, developed by Seeed Studio, is a compact IoT device featuring a 2.4″ LCD screen, IMU, microphone, buzzer, microSD card slot, light sensor, infrared emitter, and built-in Wi-Fi and Bluetooth connectivity. A notable advantage of this device is its compatibility with the Arduino IDE for programming.

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Requirements:

• ESP32
• Nimbus808 account
• Arduino IDE
• C++ Language Experience

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ESP32 Configuration

This guide assumes your ESP32 has been configured and is already connected to the internet utilizing the built-in ESP32 WiFi library.

Additionally, it assumes that you have downloaded and installed the ArduinoMqttClient by Joel Gaehwiler (Github: 256dpi/arduino-mqtt) library. ArduinoMqttClient is a popular C++ library that simplifies making MQTT requests on an ESP32 device.

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Sending data to Nimbus8083

Code Portion

Copy and paste the below code into your Arduino IDE project; assigning your nimbus808 broker, and WiFi information where indicated in the code.

#include <WiFi.h>
#include <MQTT.h>

const char ssid[] = "";
const char pass[] = "";
# Put your WiFi information here

WiFiClient net;
MQTTClient client;

unsigned long lastMillis = 0;

void connect() {
  Serial.print("checking wifi...");
  while (WiFi.status() != WL_CONNECTED){
    Serial.print(".");
    delay(1000);
  }

  Serial.print("\nconnecting...");
  while (!client.connect("arduinoTestClient")) {
    Serial.print(".");
    delay(1000);
  }

  Serial.println("\nconnected!");
}


void setup() {
  # put your setup code here, to run once:
  Serial.begin(115200);

  Serial.println("Hello, ESP32!");
  WiFi.begin(ssid, pass);
  
  client.begin("test.mosquitto.org", 1883, net);
  # Put your Nimbus808 Broker information here

  connect();

  client.subscribe("/button_status");
}

void loop() {
  # put your main code here, to run repeatedly:
  client.loop();
  delay(10); // this speeds up the simulation

  if (!client.connected()){
    connect();
  }

  if (millis() - lastMillis > 1000){
    lastMillis = millis();
    client.publish("/hello", "world");
  }
}

Once the code has been written in your Arduino IDE connect and download the program.

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Receiving data from Nimbus808

Code Portion

Copy and paste the below code in your Arduino IDE project; assigning your Nimbus808 broker, and WiFi information where indicated in the code.

#include <WiFi.h>
#include <MQTT.h>

const char ssid[] = "";
const char pass[] = "";

WiFiClient net;
MQTTClient client;

unsigned long lastMillis = 0;

void connect() {
  Serial.print("checking wifi...");
  while (WiFi.status() != WL_CONNECTED){
    Serial.print(".");
    delay(1000);
  }

  Serial.print("\nconnecting...");
  while (!client.connect("arduinoTestClient")) {
    Serial.print(".");
    delay(1000);
  }

  Serial.println("\nconnected!");
}

void messageReceived(String &topic, String &payload){

  if (topic == "/button_status") {
    Serial.println(payload);
  }
}

void setup() {
  # put your setup code here, to run once:
  Serial.begin(115200);

  client.onMessage(messageReceived);

  Serial.println("Hello, ESP32!");
  WiFi.begin(ssid, pass);
  
  client.begin("test.mosquitto.org", 1883, net);
  # Put your Nimbus808 Broker information here

  connect();

  client.subscribe("/button_status");
}

void loop() {
  # put your main code here, to run repeatedly:
  client.loop();
  delay(10); // this speeds up the simulation

  if (!client.connected()){
    connect();
  }

  if (millis() - lastMillis > 1000){
    lastMillis = millis();
    client.publish("/hello", "world");
    client.publish("/button_status", "Hello World");
  }
}

Once the code has been written in your Arduino IDE connect and download the program.

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