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| #include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 4 // pin 4
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
// Update these with values suitable for your network.
const char* ssid = "*******************";
const char* password = "****************";
const char* mqtt_server = "***************"; /// MQTT Broker
int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
void setup() {
Serial.begin(115200);
// Start up the library
sensors.begin();
setup_wifi();
client.setServer(mqtt_server, mqtt_port);
client.setCallback(callback);
Serial.println("Connected ");
Serial.print("MQTT Server ");
Serial.print(mqtt_server);
Serial.print(":");
Serial.println(String(mqtt_port));
Serial.print("ESP8266 IP ");
Serial.println(WiFi.localIP());
Serial.println("Modbus RTU Master Online");
}
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("ESP8266Client")) {
Serial.println("connected");
// client.subscribe("event");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void loop() {
sensors.requestTemperatures();
float celsius = sensors.getTempCByIndex(0);
Serial.println(sensors.getTempCByIndex(0));
char temperaturenow [15];
dtostrf(celsius,7, 3, temperaturenow); //// convert float to char
client.publish("temperature/belka/sensor", temperaturenow); /// send char
if (!client.connected()) {
reconnect();
}
{
client.loop(); //Ensure we've sent & received everything
delay(10000);
}
} |
