mirror of https://github.com/arendst/Tasmota.git
130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
/*
|
|
Basic ESP8266 MQTT example
|
|
This sketch demonstrates the capabilities of the pubsub library in combination
|
|
with the ESP8266 board/library.
|
|
It connects to an MQTT server then:
|
|
- publishes "hello world" to the topic "outTopic" every two seconds
|
|
- subscribes to the topic "inTopic", printing out any messages
|
|
it receives. NB - it assumes the received payloads are strings not binary
|
|
- If the first character of the topic "inTopic" is an 1, switch ON the ESP Led,
|
|
else switch it off
|
|
It will reconnect to the server if the connection is lost using a blocking
|
|
reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
|
|
achieve the same result without blocking the main loop.
|
|
To install the ESP8266 board, (using Arduino 1.6.4+):
|
|
- Add the following 3rd party board manager under "File -> Preferences -> Additional Boards Manager URLs":
|
|
http://arduino.esp8266.com/stable/package_esp8266com_index.json
|
|
- Open the "Tools -> Board -> Board Manager" and click install for the ESP8266"
|
|
- Select your ESP8266 in "Tools -> Board"
|
|
*/
|
|
|
|
#include <ESP8266WiFi.h>
|
|
#include <PubSubClient.h>
|
|
|
|
// Update these with values suitable for your network.
|
|
|
|
const char* ssid = "........";
|
|
const char* password = "........";
|
|
const char* mqtt_server = "broker.mqtt-dashboard.com";
|
|
|
|
WiFiClient espClient;
|
|
PubSubClient client(espClient);
|
|
unsigned long lastMsg = 0;
|
|
#define MSG_BUFFER_SIZE (50)
|
|
char msg[MSG_BUFFER_SIZE];
|
|
int value = 0;
|
|
|
|
void setup_wifi() {
|
|
|
|
delay(10);
|
|
// We start by connecting to a WiFi network
|
|
Serial.println();
|
|
Serial.print("Connecting to ");
|
|
Serial.println(ssid);
|
|
|
|
WiFi.mode(WIFI_STA);
|
|
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();
|
|
|
|
// Switch on the LED if an 1 was received as first character
|
|
if ((char)payload[0] == '1') {
|
|
digitalWrite(BUILTIN_LED, LOW); // Turn the LED on (Note that LOW is the voltage level
|
|
// but actually the LED is on; this is because
|
|
// it is active low on the ESP-01)
|
|
} else {
|
|
digitalWrite(BUILTIN_LED, HIGH); // Turn the LED off by making the voltage HIGH
|
|
}
|
|
|
|
}
|
|
|
|
void reconnect() {
|
|
// Loop until we're reconnected
|
|
while (!client.connected()) {
|
|
Serial.print("Attempting MQTT connection...");
|
|
// Create a random client ID
|
|
String clientId = "ESP8266Client-";
|
|
clientId += String(random(0xffff), HEX);
|
|
// Attempt to connect
|
|
if (client.connect(clientId.c_str())) {
|
|
Serial.println("connected");
|
|
// Once connected, publish an announcement...
|
|
client.publish("outTopic", "hello world");
|
|
// ... and resubscribe
|
|
client.subscribe("inTopic");
|
|
} else {
|
|
Serial.print("failed, rc=");
|
|
Serial.print(client.state());
|
|
Serial.println(" try again in 5 seconds");
|
|
// Wait 5 seconds before retrying
|
|
delay(5000);
|
|
}
|
|
}
|
|
}
|
|
|
|
void setup() {
|
|
pinMode(BUILTIN_LED, OUTPUT); // Initialize the BUILTIN_LED pin as an output
|
|
Serial.begin(115200);
|
|
setup_wifi();
|
|
client.setServer(mqtt_server, 1883);
|
|
client.setCallback(callback);
|
|
}
|
|
|
|
void loop() {
|
|
|
|
if (!client.connected()) {
|
|
reconnect();
|
|
}
|
|
client.loop();
|
|
|
|
unsigned long now = millis();
|
|
if (now - lastMsg > 2000) {
|
|
lastMsg = now;
|
|
++value;
|
|
snprintf (msg, MSG_BUFFER_SIZE, "hello world #%ld", value);
|
|
Serial.print("Publish message: ");
|
|
Serial.println(msg);
|
|
client.publish("outTopic", msg);
|
|
}
|
|
}
|