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MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...要求场景。 可以通过桥接，使得Mosquitto也能作为一个聚合设备（网关）接入EMQX。
EMQX 搭建参考：https://blog.csdn.net/xiaolong11 ... e/details/134280836
Mosquitto 安装包下载：https://mosquitto.org/download/
2、与Node-RED有啥区别？Node-RED ...
APP INVENTOR硬件交互学习教程03——巧借arduino nano 配置HC-05 - 创客硬...
...角色AT+ROLE,我们需要配置成从角色，手机是主角色
另外一个就是AT+PSWD?，这个手机配对是需要的
最后一个就是AT+UART?,波特率我们使用9600，当然你可以自行设置成其他。
4.通过上面设置后，我们就可以来使用模块进行数据通信...
App Inventor 2 MultiImagePicker 拓展：实现图片/视频多选功能 - App Inve...
...点击左下角 Extension 导入拓展
第二步：设计界面
添加一个按钮和 MultiImagePicker 组件，再加一个 Label 用来显示选中的图片路径。
第三步：编写逻辑
多选示例（选择最多5张图片）：
当 Button1.被点击：
- 调用 MultiImageP...
What can you use Python generator functions for?
I'm starting to learn Python and I've come across generator functions, those that have a yield statement in them. I want to know what types of problems that these functions are really good at solving.
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How can I view all the git repositories on my machine?
Is there a way in which I can see all the git repositories that exist on my machine? Any command for that?
10 Answers
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IntelliJ inspection gives “Cannot resolve symbol” but still compiles code
Platform: IntelliJ Community Edition 10.0.3
SDK: jdk1.6.0_21
OS: Windows 7
51 Answers
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When should I use mmap for file access?
POSIX environments provide at least two ways of accessing files. There's the standard system calls open() , read() , write() , and friends, but there's also the option of using mmap() to map the file into virtual memory.
...
What happens to a declared, uninitialized variable in C? Does it have a value?
...t. I have cited the standard in my answer.
– DigitalRoss
Oct 20 '09 at 22:01
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show 16 more comments
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How to update Ruby to 1.9.x on Mac?
...y Version Manager) is the Standard for upgrading your Ruby installation on OSX: https://rvm.io
To get started, open a Terminal Window and issue the following command:
\curl -L https://get.rvm.io | bash -s stable --ruby
( you will need to trust the RVM Dev Team that the command is not malicious ...
Why can't strings be mutable in Java and .NET?
...ss authentication
which is necessary before the call
will be passed to OS. If String was
mutable it was possible somehow to
modify its content after the
authentication check before OS gets
request from program then it is
possible to request any file. So if
you have a right to open te...