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* It will connect to a public MQTT server (with/without TLS)

* and subscribe to TOPIC_SUBSCRIBE (defined below).

* - When a message is received, it will echo back to TOPIC_ECHO

* - If the received message is "stop", we will

* unsubscribe from TOPIC_SUBSCRIBE and you won't be able to

* echo content back to the broker any longer.

* Note: TOPIC_SUBSCRIBE and TOPIC_ECHO must not be the same topic!

* Ex. They must not be "adafruit/+" and "adafruit/echo", since this will

* cause an infinite loop (received -> echo -> received -> ....)

* For details on the MQTT broker server see http://test.mosquitto.org/

* - Port 1883 : MQTT, unencrypted

* - Port 8883 : MQTT, encrypted (TLS)

* Note: may You need an MQTT desktop client such as the lightweight

* Java client included in this repo: org.eclipse.paho.mqtt.utility-1.0.0.jar

* For information on configuring your system to work with MQTT see:

* - https://learn.adafruit.com/desktop-mqtt-client-for-adafruit-io/installing-software

* To run this demo

* 1. Change the WLAN_SSID/WLAN_PASS to match your access point

* 2. Decide whether you want to use TLS/SSL or not (USE_TLS)

* 3. Change TOPIC*, WILL*, enable CLIENTID if needed

* 4. Compile and run

* 5. Use an MQTT desktop client to connect to the same MQTT broker and

* publish to any topic beginning with "adafruit/feather/" (depending

* on TOPIC_SUBSCRIBE). To be able to recieve the echo message, please

* also subcribe to "adafruit/feather_echo" (TOPIC_ECHO).

#define WLAN_SSID "yourSSID"

#define WLAN_PASS "yourPass"

#define USE_TLS 0

#define BROKER_HOST "test.mosquitto.org"

#define BROKER_PORT (USE_TLS ? 8883 : 1883)

// Uncomment to set your own ClientID, otherwise a random ClientID is used

//#define CLIENTID "Adafruit Feather"

#define TOPIC_SUBSCRIBE "adafruit/feather/+"

#define TOPIC_ECHO "adafruit/feather_echo"

#define WILL_TOPIC "adafruit/feather"

#define WILL_MESSAGE "Goodbye!!"

AdafruitMQTT mqtt;

/**************************************************************************/

/*!

@brief Disconnect handler for MQTT broker connection

/**************************************************************************/

void disconnect_callback(void)

{

Serial.println();