TKK_E32211801/app/Libraries/examples/README.md

Output example

For info on MQTT: https://mntolia.com/fundamentals-mqtt/#4_Advantages_of_MQTT_for_IoT_over_HTTP_UDP

Before running each file be sure to review the four connection parameters in the headers.

subscribe.php

This example is to demonstrate using MQTT for a long-running script that will wait for subscribed topics. This script is not suitable to be run as web requests, instead should be run on the commandline.

Let subscribe.php listening the broker:

$ php subscribe.php 
Msg Recieved: Fri, 13 Jan 2017 01:58:23 +0000
Topic: bluerhinos/phpMQTT/examples/publishtest

	Hello World! at Fri, 13 Jan 2017 01:58:23 +0000

Msg Recieved: Fri, 13 Jan 2017 01:58:35 +0000
Topic: bluerhinos/phpMQTT/examples/publishtest

	Hello World! at Fri, 13 Jan 2017 01:58:35 +0000

^C

publish.php

This example will publish a message to a topic.

The results shown above corresponds to publisher's two actions:

$ php publish.php
$ php publish.php

When run as a web request you it is ok to just $mqtt->connect(), $mqtt->publish() and $mqtt->close(). If it is being run as long-running command line script you should run $mqtt->proc() regularly in order maintain the connection with the broker.

subscribeAndWaitForMessage.php

In order to use this library to display messages on a website you can use $mqtt->subscribeAndWaitForMessage(), this will subscribe to a topic and then wait for, and return the message. If you want messages to appear instantly, you should use retained messages (https://mntolia.com/mqtt-retained-messages-explained-example/)