Install on Ubuntu, use Mqtt Mosquitto

The following describes how to install Mosquitto and communicate using MQTT


1. Introduction of Mosquitto Warehouse and update
$sudo apt-add-repository Ppa:mosquitto-dev/mosquitto-ppa

$sudo apt-get Update

2. Install the Mosquitto package by executing the following command

$sudo Apt-get Install Mosquitto

3. Installing the Mosquitto Development Kit

$sudo Apt-get Install Libmosquitto-dev

4. Installing the Mosquitto client

$sudo Apt-get Install Mosquitto-clients

5. Query whether Mosquitto is running correctly

$sudo Service Mosquitto Status

6. The native test opens a terminal and executes the following command to subscribe to the topic "MQTT"

$mosquitto _sub-h localhost-t "Mqtt"-V

Open another terminal, post a message to the topic "MQTT"

$mosquitto _pub-h localhost-t "Mqtt"-M "Hello Mqtt"

Now you will see that the message is displayed on the previous terminal.

7. Network Test (test.mosquitto.org) subscribe all topics from test.mosquitto.org, anyone post any message you can receive, you will see a lot of interesting messages scrolling on your screen.
You can also post some interesting messages, and everyone who subscribes will receive the same.

$mosquitto _sub-h test.mosquitto.org-t "#"-V

Of course, you can also subscribe to specific topics to receive your own messages.

$mosquitto _sub-h test.mosquitto.org-t "Msg_only_from_me"-V

Post a message to a specific topic on another terminal, the message "My cat is Luna" should appear on the previous terminal

$mosquitto _pub-h test.mosquitto.org-t "Msg_only_from_me"-M "My Cat is Luna"

The test.mosquitto.org supports both encrypted and unencrypted MQTT message patterns, as well as TCP or WebSocket as the bearer, and can be used to observe different package formats by Wireshark packet capture.

Mosquitto man page:

https://mosquitto.org/documentation/

Reprint Address: http://blog.csdn.net/swedenfeng/article/details/53510048