Adafruit_MQTT_Library/examples/mqtt_fona/mqtt_fona.ino

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/***************************************************
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Adafruit MQTT Library FONA Example
Designed specifically to work with the Adafruit FONA
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----> http://www.adafruit.com/products/1946
----> http://www.adafruit.com/products/1963
----> http://www.adafruit.com/products/2468
----> http://www.adafruit.com/products/2542
These cellular modules use TTL Serial to communicate, 2 pins are
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required to interface.
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
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products from Adafruit!
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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#include <Adafruit_SleepyDog.h>
#include <SoftwareSerial.h>
#include "Adafruit_FONA.h"
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_FONA.h"
/*************************** FONA Pins ***********************************/
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// Default pins for Feather 32u4 FONA
#define FONA_RX 9
#define FONA_TX 8
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#define FONA_RST 4
SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);
Adafruit_FONA fona = Adafruit_FONA(FONA_RST);
/************************* WiFi Access Point *********************************/
// Optionally configure a GPRS APN, username, and password.
// You might need to do this to access your network's GPRS/data
// network. Contact your provider for the exact APN, username,
// and password values. Username and password are optional and
// can be removed, but APN is required.
#define FONA_APN ""
#define FONA_USERNAME ""
#define FONA_PASSWORD ""
/************************* 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..."
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/************ Global State (you don't need to change this!) ******************/
// Setup the FONA MQTT class by passing in the FONA class and MQTT server and login details.
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Adafruit_MQTT_FONA mqtt(&fona, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
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// You don't need to change anything below this line!
#define halt(s) { Serial.println(F( s )); while(1); }
// FONAconnect is a helper function that sets up the FONA and connects to
// the GPRS network. See the fonahelper.cpp tab above for the source!
boolean FONAconnect(const __FlashStringHelper *apn, const __FlashStringHelper *username, const __FlashStringHelper *password);
/****************************** Feeds ***************************************/
// 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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const char PHOTOCELL_FEED[] = AIO_USERNAME "/feeds/photocell";
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Adafruit_MQTT_Publish photocell = Adafruit_MQTT_Publish(&mqtt, PHOTOCELL_FEED);
// Setup a feed called 'onoff' for subscribing to changes.
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const char ONOFF_FEED[] = AIO_USERNAME "/feeds/onoff";
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Adafruit_MQTT_Subscribe onoffbutton = Adafruit_MQTT_Subscribe(&mqtt, ONOFF_FEED);
/*************************** Sketch Code ************************************/
// How many transmission failures in a row we're willing to be ok with before reset
uint8_t txfailures = 0;
#define MAXTXFAILURES 3
void setup() {
while (!Serial);
// Watchdog is optional!
//Watchdog.enable(8000);
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Serial.begin(115200);
Serial.println(F("Adafruit FONA MQTT demo"));
mqtt.subscribe(&onoffbutton);
Watchdog.reset();
delay(5000); // wait a few seconds to stabilize connection
Watchdog.reset();
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// Initialise the FONA module
while (! FONAconnect(F(FONA_APN), F(FONA_USERNAME), F(FONA_PASSWORD))) {
Serial.println("Retrying FONA");
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}
Serial.println(F("Connected to Cellular!"));
Watchdog.reset();
delay(5000); // wait a few seconds to stabilize connection
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Watchdog.reset();
}
uint32_t x=0;
void loop() {
// Make sure to reset watchdog every loop iteration!
Watchdog.reset();
// 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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Watchdog.reset();
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// Now we can publish stuff!
Serial.print(F("\nSending photocell val "));
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Serial.print(x);
Serial.print("...");
if (! photocell.publish(x++)) {
Serial.println(F("Failed"));
txfailures++;
} else {
Serial.println(F("OK!"));
txfailures = 0;
}
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Watchdog.reset();
// this is our 'wait for incoming subscription packets' busy subloop
Adafruit_MQTT_Subscribe *subscription;
while ((subscription = mqtt.readSubscription(5000))) {
if (subscription == &onoffbutton) {
Serial.print(F("Got: "));
Serial.println((char *)onoffbutton.lastread);
}
}
// ping the server to keep the mqtt connection alive, only needed if we're not publishing
//if(! mqtt.ping()) {
// Serial.println(F("MQTT Ping failed."));
//}
}
// 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!");
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}