Adafruit_MQTT_Library/examples/mqtt_arbitrary_data/mqtt_arbitrary_data.ino

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/***************************************************
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Adafruit MQTT Library Arbitrary Data Example
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Must use 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!
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Written by Stuart Feichtinger
Modifed from the mqtt_esp8266 example written by Tony DiCola for Adafruit Industries.
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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 *********************************/
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#define ARB_SERVER "...host computer ip address..."
#define ARB_SERVERPORT 1883 // use 8883 for SSL
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#define ARB_USERNAME "TestUser"
#define ARB_PW "TestUser"
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/************ Global State (you don't need to change this!) ******************/
// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;
// or... use WiFiFlientSecure for SSL
//WiFiClientSecure client;
// Store the MQTT server, username, and password in flash memory.
// This is required for using the Adafruit MQTT library.
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const char MQTT_SERVER[] PROGMEM = ARB_SERVER;
const char MQTT_USERNAME[] PROGMEM = ARB_USERNAME;
const char MQTT_PASSWORD[] PROGMEM = ARB_PW;
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// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
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Adafruit_MQTT_Client mqtt(&client, MQTT_SERVER, ARB_SERVERPORT, MQTT_USERNAME, MQTT_PASSWORD);
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/****************************** Feeds ***************************************/
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// Setup a feed called 'arb_packet' for publishing.
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// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
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const char ARB_FEED[] PROGMEM = "/feeds/arb_packet";
Adafruit_MQTT_Publish ap = Adafruit_MQTT_Publish(&mqtt, ARB_FEED);
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// Arbitrary Payload
// Union allows for easier interaction of members in struct form with easy publishing
// of "raw" bytes
typedef union{
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//Customize struct with whatever variables/types you like.
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struct __attribute__((__packed__)){ // packed to eliminate padding for easier parsing.
char charAry[10];
int16_t val1;
unsigned long val2;
uint16_t val3;
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}s;
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uint8_t raw[sizeof(s)]; // For publishing
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} packet_t;
/*
// Alternate Option with anonymous struct, but manual byte count:
struct __attribute__((__packed__)){ // packed to eliminate padding for easier parsing.
char charAry[10]; // 10 x 1 byte = 10 bytes
int16_t val1; // 1 x 2 bytes = 2 bytes
unsigned long val2; // 1 x 4 bytes = 4 bytes
uint16_t val3; // 1 x 2 bytes = 2 bytes
-------------------
TOTAL = 18 bytes
};
uint8_t raw[18]; // For publishing
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} packet_t;
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/*
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/*************************** 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 setup() {
Serial.begin(115200);
delay(10);
Serial.println(F("Adafruit MQTT demo"));
// Connect to WiFi access point.
Serial.println(); Serial.println();
Serial.print(F("Connecting to "));
Serial.println(WLAN_SSID);
WiFi.begin(WLAN_SSID, WLAN_PASS);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(F("."));
}
Serial.println();
Serial.println(F("WiFi connected"));
Serial.println(F("IP address: ")); Serial.println(WiFi.localIP());
}
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packet_t arbPac;
const char strVal[] PROGMEM = "Hello!";
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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();
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//Update arbitrary packet values
strcpy_P(arbPac.s.charAry, strVal);
arbPac.s.val1 = -4533;
arbPac.s.val2 = millis();
arbPac.s.val3 = 3354;
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/*
// Alternate Union with anonymous struct
strcpy_P(arbPac.charAry, strVal);
arbPac.val1 = -4533;
arbPac.val2 = millis();
arbPac.val3 = 3354;
*/
if (! ap.publish(arbPac.raw, sizeof(packet_t)))
Serial.println(F("Publish Failed."));
else {
Serial.println(F("Publish Success!"));
delay(500);
}
delay(10000);
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// ping the server to keep the mqtt connection alive
// NOT required if you are publishing once every KEEPALIVE seconds
/*
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(F("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(F("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(F("MQTT Connected!"));
}