Nonsense not to say, directly see the effect!

MQTT is a simple introduction to the details of the see, this article focuses on MQTT pit and local debugging!

MQTT in plain English:

MQTT is a long link protocol based on message topic/subscription transport for client and server two-way communication
Passing of time need to pass a url and port number to connect, format for: “TCP: / / broker. Emqx. IO: 1883”
When the client connects to the server, it passes a topic string, which is used to send messages to the server
When the server sends messages to the client, the client needs to subscribe() the server
Others:
- ClientId // Identifies the user ID
- MqttVersion // MQTT version number
- IsAutomaticReconnect // Whether to reconnect
- .

MAC Installation environment:

Terminal type command: brew Install mosquitto

Could eventually in the configuration of MQTT parameters: / usr/local/Cellar/mosquitto/version number/etc/mosquitto/mosquitto. Conf

Detailed configuration point me

MAC Download local debugging software

Download address

When the download is complete, it will look like this:

Then configure some parameters

MQTTandroid side of the code is everywhere on the Internet, so don’t waste your time, directly download to have a look at it.

MQTT download address

The last thing to note is that the server also subscribes to the topic, which must be filled in here