MQTT Example

[MonsterJoe]

// Example to read channel 1 and output to MQTT server
// Patched together from the other examples
// Install EmonLib and PubSubClient

#include <ETH.h>
#include <PubSubClient.h>
#include "Arduino.h"
#include "EmonLib.h"
EnergyMonitor emon1;
#define ETH_ADDR        0
#define ETH_POWER_PIN  -1
#define ETH_MDC_PIN    23
#define ETH_MDIO_PIN   18
#define ETH_TYPE       ETH_PHY_LAN8720
#define ETH_CLK_MODE   ETH_CLOCK_GPIO17_OUT
// WiFiUDP Udp;                      //Create UDP object
unsigned int localUdpPort = 4196; //local port
IPAddress local_ip(10, 0, 0, 143);
IPAddress gateway(10, 0, 0, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress dns(10, 0, 0, 1);
#define s0 32
#define s1 33
#define s2 13
#define s3 16
#define IN3 35
int toggleState_1 = 1; //Define integer to remember the toggle state for relay 1
int toggleState_2 = 1; //Define integer to remember the toggle state for relay 2
int toggleState_3 = 1; //Define integer to remember the toggle state for relay 3
int toggleState_4 = 1; //Define integer to remember the toggle state for relay 4
// Update these with values suitable for your network.
const char* mqttServer = "10.0.0.16";
const char* mqttUserName = ""; // MQTT username
const char* mqttPwd = ""; // MQTT password
const char* clientID = "clientId"; // client id
WiFiClient espClient;
PubSubClient client(espClient);
int value = 0;
void setup_ethernet() {
  ETH.begin(ETH_ADDR, ETH_POWER_PIN, ETH_MDC_PIN, ETH_MDIO_PIN, ETH_TYPE, ETH_CLK_MODE); //start with ETH
  if (ETH.config(local_ip, gateway, subnet, dns, dns) == false) {
    Serial.println("LAN8720 Configuration failed.");
  }else{Serial.println("LAN8720 Configuration success.");}
  Serial.println("Connected");
  Serial.print("IP Address:");
  Serial.println(ETH.localIP());
}
void reconnect() {
  while (!client.connected()) {
    if (client.connect(clientID, mqttUserName, mqttPwd)) {
      Serial.println("MQTT connected");
      // ... and resubscribe
    }
    else
    {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  Serial.println("");
}
String byteToHexString(uint8_t byte) {
  String hexStr = String(byte, HEX);
  if (hexStr.length() == 1) {
    hexStr = "0" + hexStr;
  }
  return hexStr;
}
void setup() {
  Serial.begin(115200);
  pinMode(s0,OUTPUT);
  pinMode(s1,OUTPUT);
  pinMode(s2,OUTPUT);
  pinMode(s3,OUTPUT);
  pinMode(IN3,INPUT);
  setup_ethernet();
  client.setBufferSize(2048);
  client.setServer(mqttServer, 1883);
  client.setCallback(callback);  
 
  emon1.current(IN3, 20); // ADC_PIN is the pin where SCT013 is connected, 20 amps
}
void loop() {
  if (!client.connected()) {
    reconnect();
  }
 
  client.loop();
  Serial.println("done loop");
  // Set Low/High to flag for the input to read from: 0000 = chanel 1 to 1111 chanel 16
  digitalWrite(s0,LOW);
  digitalWrite(s1,LOW);
  digitalWrite(s2,LOW);
  digitalWrite(s3,LOW);
  if(analogRead(IN3)!=0){
    double Irms = emon1.calcIrms(1480);  // Calculate Irms only, 1480 is num samples per second
    Irms = Irms * 110; // 110v
   
    Serial.printf("A3 on CH1=%d\n",Irms);
    String val = "val 1 " + String(Irms);
    client.publish("sensorData", val.c_str());
  }
 
  delay(2000);
}

[admin]

thanks for share your code.