Permalink
faad899 Aug 15, 2016
161 lines (118 sloc) 4.61 KB
/***************************************************
Adafruit MQTT Library ESP8266 Adafruit IO SSL/TLS example
Must use the latest version of ESP8266 Arduino from:
https://github.com/esp8266/Arduino
Works great with Adafruit's Huzzah ESP board & Feather
----> https://www.adafruit.com/product/2471
----> https://www.adafruit.com/products/2821
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Tony DiCola for Adafruit Industries.
SSL/TLS additions by Todd Treece for Adafruit Industries.
MIT license, all text above must be included in any redistribution
****************************************************/
#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
/************************* WiFi Access Point *********************************/
#define WLAN_SSID "...your SSID..."
#define WLAN_PASS "...your password..."
/************************* Adafruit.io Setup *********************************/
#define AIO_SERVER "io.adafruit.com"
#define AIO_SERVERPORT 8883 // 8883 for MQTTS
#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!) ******************/
// WiFiFlientSecure for SSL/TLS support
WiFiClientSecure client;
// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
// io.adafruit.com SHA1 fingerprint
const char* fingerprint = "26 96 1C 2A 51 07 FD 15 80 96 93 AE F7 32 CE B9 0D 01 55 C4";
/****************************** Feeds ***************************************/
// Setup a feed called 'test' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Publish test = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/test");
/*************************** Sketch Code ************************************/
// Bug workaround for Arduino 1.6.6, it seems to need a function declaration
// for some reason (only affects ESP8266, likely an arduino-builder bug).
void MQTT_connect();
void verifyFingerprint();
void setup() {
Serial.begin(115200);
delay(10);
Serial.println(F("Adafruit IO MQTTS (SSL/TLS) Example"));
// Connect to WiFi access point.
Serial.println(); Serial.println();
Serial.print("Connecting to ");
Serial.println(WLAN_SSID);
delay(1000);
WiFi.begin(WLAN_SSID, WLAN_PASS);
delay(2000);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("WiFi connected");
Serial.println("IP address: "); Serial.println(WiFi.localIP());
// check the fingerprint of io.adafruit.com's SSL cert
verifyFingerprint();
}
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();
// Now we can publish stuff!
Serial.print(F("\nSending val "));
Serial.print(x);
Serial.print(F(" to test feed..."));
if (! test.publish(x++)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
// wait a couple seconds to avoid rate limit
delay(2000);
}
void verifyFingerprint() {
const char* host = AIO_SERVER;
Serial.print("Connecting to ");
Serial.println(host);
if (! client.connect(host, AIO_SERVERPORT)) {
Serial.println("Connection failed. Halting execution.");
while(1);
}
if (client.verify(fingerprint, host)) {
Serial.println("Connection secure.");
} else {
Serial.println("Connection insecure! Halting execution.");
while(1);
}
}
// 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... ");
uint8_t retries = 3;
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
retries--;
if (retries == 0) {
// basically die and wait for WDT to reset me
while (1);
}
}
Serial.println("MQTT Connected!");
}