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6LYTH3/my_mqtt.ino

Last active January 3, 2021 08:24
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Connect MQTT with NodeMCU 8266
Raw
my_mqtt.ino
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
const char* ssid = "ssid_name";
const char* password = "ssid_password";
const char* mqtt_server = "broker.emqx.io";
const char mqtt_username[50] = "";
const char mqtt_password[50] = "";
const int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[10]; // 0 off, 1 on
int value = 0;
int cnt = 0;
void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
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();
if ((char)payload[0] == '1') {
digitalWrite(BUILTIN_LED, LOW);
value = 1;
} else {
value = 0;
digitalWrite(BUILTIN_LED, HIGH);
}
}
void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection…");
String clientId = "ESP8266Client - ";
clientId += String(random(0xffff), HEX);
// client.connect(clientId.c_str(), mqtt_username, mqtt_password)
if (client.connect(clientId.c_str())) {
Serial.println("connected");
client.publish("mychn1234/in", "Start Programe");
client.subscribe("mychn1234/out");
} else {
Serial.print("failed, rc = ");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void setup() {
pinMode(BUILTIN_LED, OUTPUT);
digitalWrite(BUILTIN_LED, HIGH);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, mqtt_port);
client.setCallback(callback);
}
void loop() {
delay(5000);
if (!client.connected()) {
Serial.println("Cannot connect to MQTT");
reconnect();
delay(5000);
}
client.loop();
++cnt;
if (cnt % 10 == 0) {
value = 0;
digitalWrite(BUILTIN_LED, HIGH);
}
Serial.print("Value from LOOP");
Serial.println(value);
snprintf (msg, 2, "%ld", value);
Serial.print("Publish message: ");
Serial.println(msg);
client.publish("mychn1234/in", msg);
}
Raw
my_mqtt_detect.ino
// สำหรับส่งสัญญาณจากการ detect ระดับน้ำจากแทงค์
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#define D1 5
#define button D1
const char* ssid = "ssid_name";
const char* password = "password";
const char* mqtt_server = "broker.emqx.io";
const char mqtt_username[50] = "";
const char mqtt_password[50] = "";
const int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[10]; // 0 off, 1 on
int value = 0;
int cnt = 0;
void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
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();
if ((char)payload[0] == '1') {
digitalWrite(BUILTIN_LED, LOW);
value = 1;
} else {
value = 0;
digitalWrite(BUILTIN_LED, HIGH);
}
}
void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection…");
String clientId = "ESP8266Client - ";
clientId += String(random(0xffff), HEX);
// client.connect(clientId.c_str(), mqtt_username, mqtt_password
if (client.connect(clientId.c_str())) { //ทำการ Connect โดยใช้ Username&Password
Serial.println("connected");
client.publish("mychn77882/out", "hello world from 2");
} else {
Serial.print("failed, rc = ");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void setup() {
pinMode(button, INPUT_PULLUP);
pinMode(BUILTIN_LED, OUTPUT);
digitalWrite(BUILTIN_LED, HIGH);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, mqtt_port);
client.setCallback(callback);
}
void loop() {
delay(5000);
if (!client.connected()) {
Serial.println("Cannot connect to MQTT");
reconnect();
delay(5000);
}
client.loop();
bool readSwitch = digitalRead(button);
value = 0;
if (readSwitch == LOW) {
value = 1;
Serial.println("Pressed Switch");
delay(500);
}
Serial.print("Value from LOOP");
Serial.println(value);
snprintf (msg, 2, "%ld", value);
Serial.print("Publish message: ");
Serial.println(msg);
client.publish("mychn77882/out", msg);
}
Raw
my_mqtt_switch.ino
// สำหรับต่อกับ switch ใช้สั่งงาน on / off
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
const char* ssid = "ssid_name";
const char* password = "password";
const char* mqtt_server = "broker.emqx.io";
const char mqtt_username[50] = "";
const char mqtt_password[50] = "";
const int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[10]; // 0 off, 1 on
int value = 0;
int cnt = 0;
void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
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();
if ((char)payload[0] == '1') {
digitalWrite(BUILTIN_LED, LOW);
value = 1;
} else {
value = 0;
digitalWrite(BUILTIN_LED, HIGH);
}
}
void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection…");
String clientId = "ESP8266Client - ";
clientId += String(random(0xffff), HEX);
// client.connect(clientId.c_str(), mqtt_username, mqtt_password
if (client.connect(clientId.c_str())) { //ทำการ Connect โดยใช้ Username&Password
Serial.println("connected");
client.subscribe("mychn77882/out");
} else {
Serial.print("failed, rc = ");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void setup() {
pinMode(BUILTIN_LED, OUTPUT);
digitalWrite(BUILTIN_LED, HIGH);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, mqtt_port);
client.setCallback(callback);
}
void loop() {
delay(5000);
if (!client.connected()) {
Serial.println("Cannot connect to MQTT");
reconnect();
delay(5000);
}
client.loop();
}
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