MQTT is a publish and subscribe messaging protocol based on TCP/IP . It is lightweight, simple, open and easy to implement. It is actually a message broker. The device publishes a topic and subscribes
[i=s] This post was last edited by lb8820265 on 2019-5-9 23:11 [/i] [align=left][font=微软雅黑] Previously, we introduced two ways to use VC6 to make serial port debugging tools: [url=https://home.eeworld
[i=s]This post was last edited by roc2 on 2019-10-6 17:10[/i]The first line of JAVA code is
System.out.println("Hello, World!");PHP is
echo "Hello world";And Python is
print ("Hello, World")1. Tool ma
Analysis of the principle of power switching circuit:
1 input power is 12V power adapter
2-way input power supply is 12V lithium battery
Requirements: The power adapter is the main power source, and t