Adafruit_MQTT_Library/examples/mqtt_ethernet/mqtt_ethernet.ino
2016-08-09 21:12:49 -04:00

129 lines
4.0 KiB
C++

/***************************************************
Adafruit MQTT Library Ethernet Example
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Alec Moore
Derived from the code written by Limor Fried/Ladyada for Adafruit Industries.
MIT license, all text above must be included in any redistribution
****************************************************/
#include <SPI.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include <Ethernet.h>
#include <EthernetClient.h>
#include <Dns.h>
#include <Dhcp.h>
/************************* Ethernet Client Setup *****************************/
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
//Uncomment the following, and set to a valid ip if you don't have dhcp available.
//IPAddress iotIP (192, 168, 0, 42);
//Uncomment the following, and set to your preference if you don't have automatic dns.
//IPAddress dnsIP (8, 8, 8, 8);
//If you uncommented either of the above lines, make sure to change "Ethernet.begin(mac)" to "Ethernet.begin(mac, iotIP)" or "Ethernet.begin(mac, iotIP, dnsIP)"
/************************* Adafruit.io Setup *********************************/
#define AIO_SERVER "io.adafruit.com"
#define AIO_SERVERPORT 1883
#define AIO_USERNAME "...your AIO username (see https://accounts.adafruit.com)..."
#define AIO_KEY "...your AIO key..."
/************ Global State (you don't need to change this!) ******************/
//Set up the ethernet client
EthernetClient client;
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
// You don't need to change anything below this line!
#define halt(s) { Serial.println(F( s )); while(1); }
/****************************** Feeds ***************************************/
// Setup a feed called 'photocell' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Publish photocell = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/photocell");
// Setup a feed called 'onoff' for subscribing to changes.
Adafruit_MQTT_Subscribe onoffbutton = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/onoff");
/*************************** Sketch Code ************************************/
void setup() {
Serial.begin(115200);
Serial.println(F("Adafruit MQTT demo"));
// Initialise the Client
Serial.print(F("\nInit the Client..."));
Ethernet.begin(mac);
delay(1000); //give the ethernet a second to initialize
mqtt.subscribe(&onoffbutton);
}
uint32_t x=0;
void loop() {
// Ensure the connection to the MQTT server is alive (this will make the first
// connection and automatically reconnect when disconnected). See the MQTT_connect
// function definition further below.
MQTT_connect();
// this is our 'wait for incoming subscription packets' busy subloop
Adafruit_MQTT_Subscribe *subscription;
while ((subscription = mqtt.readSubscription(1000))) {
if (subscription == &onoffbutton) {
Serial.print(F("Got: "));
Serial.println((char *)onoffbutton.lastread);
}
}
// Now we can publish stuff!
Serial.print(F("\nSending photocell val "));
Serial.print(x);
Serial.print("...");
if (! photocell.publish(x++)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
// ping the server to keep the mqtt connection alive
if(! mqtt.ping()) {
mqtt.disconnect();
}
}
// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect() {
int8_t ret;
// Stop if already connected.
if (mqtt.connected()) {
return;
}
Serial.print("Connecting to MQTT... ");
while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
Serial.println(mqtt.connectErrorString(ret));
Serial.println("Retrying MQTT connection in 5 seconds...");
mqtt.disconnect();
delay(5000); // wait 5 seconds
}
Serial.println("MQTT Connected!");
}