Codecraft Requests - MQTT over WIFI

[vongomben]

I have this code in mind. I'd like to bring this code in CodeCraft, or something simpler

Set Wifi

Image:

Code

const char ssid[] = SECRET_SSID;
const char pass[] = SECRET_PASS;

[vongomben]

Image

Code

#include "rpcWiFi.h"

void connect() {
  Serial.print("checking wifi...");

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

  Serial.println("\nconnected!");
  return 1;
}

void setup(){
 WiFi.begin(ssid, pass);
}

void loop(){

}

[vongomben]

This one is new, from scratch, because if you really drag the corresponding command from tinkergen you start don't understanding anything lol

Image

(ping me if you want the svg, I suspect you use the scratch engine to produce them though)

Code

#include <MQTT.h>

#define BROKER_IP    "broker.hivemq.com"
#define DEV_NAME     "mqttdevice"
#define MQTT_USER    "mqtt_user"
#define MQTT_PW      "mqtt_password"

[vongomben]

We can subscribe to a new channel by creating it, a "payload" appears in the corresponding palette. The payload will later allow us to read and analyse the value arriving.

[vongomben]

Publishing on a channel affects the declaration of the publishing data

#include <MQTT.h>

#define MQTT_PUB     "/pubChannel"

voide setup(){

}

void loop(){

 client.publish(MQTT_PUB, data); 
}

[vongomben]

We add to the connect() function this mqtt part to make things simpler. Another way could be using two different functions. What do you think?

void connect() {
  Serial.print("checking wifi...");

  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }
  Serial.print("\nconnecting...");

  while (!client.connect(DEV_NAME, MQTT_USER, MQTT_PW)) {

    Serial.print(".");
    delay(1000);

  }

  Serial.println("\nconnected!");

}

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, pass);

  client.begin(BROKER_IP, 1883, net);
  client.onMessage(messageReceived);

  connect();

}

[vongomben]

The messageReceived function is called whenever a message is received. We can use the payload to compare with other elements of the code.

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

}

client.subscribe(MQTT_SUB); has to be addedd to the connect() function, the #define MQTT_SUB as an absolute declaration.

void connect() {
  Serial.print("checking wifi...");

  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }
  Serial.print("\nconnecting...");

  while (!client.connect(DEV_NAME, MQTT_USER, MQTT_PW)) {

    Serial.print(".");
    delay(1000);

  }

  Serial.println("\nconnected!");
  client.subscribe(MQTT_SUB); //SUBSCRIBE TO TOPIC /hello

}

I would need a prototype to make a better example of messageReveived()

[chenwenhao568]

Done