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