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App Inventor 2 串口组件：App使用OTG数据线进行串口通信 · App Inventor 2 中文网
...可以看到，手机串口连接时，没有像PC那样指定“COM3”等端口，而是直接使用默认的USB设备：
切换 目录 关注 我们 关注我，不迷路 在线 ...
手机APP上的串口通信组件 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...可以看到，手机串口连接时，没有像PC那样指定“COM3”等端口，而是直接使用默认的USB设备：
有一个英文原版视频，请参考“串口通信器“组件相关文档：《App Inventor 2 串口组件：App使用OTG数据线进行串口通信》
App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...果如下：
App设计及代码
服务器地址：bemfa.com
端口：9501
客户端ID：（MQTT云控制台获取）
订阅主题：APPMQTT
新建项目，导入MQTT拓展，可在“界面设计”的拓展属性中进行服务器通信基本设置：
也可以在“程序设计...
“Keep Me Logged In” - the best approach
...hat they know the algorithm that you used. For example:
md5(salt+username+ip+salt)
Now, all an attacker needs to do is brute force the "salt" (which isn't really a salt, but more on that later), and he can now generate all the fake tokens he wants with any username for his IP address! But brute-f...
How can I change the color of AlertDialog title and the color of the line under it
...er, and in the example I created a custom view that seemed to cater to the IP Address example you give in your original question.
With QustomDialog, in order to create a basic dialog (title, message) with a desired different color for the title or divider, you use the following code:
private Stri...
Accessing localhost:port from Android emulator
...
You can access your host machine with the IP address "10.0.2.2".
This has been designed in this way by the Android team. So your webserver can perfectly run at localhost and from your Android app you can access it via "http://10.0.2.2:<hostport>".
If your em...
What is the difference between active and passive FTP?
.... Thus, to support this mode, not only should your server have to have multiple ports available, your firewall should also allow connections to all those ports to pass through!
To mitigate the risks, a good solution would be to specify a range of ports on your server and then to allow only that ran...
MySQL connection not working: 2002 No such file or directory
... bound to the use of Unix domain sockets. It is not possible to open a TCP/IP connection using the hostname localhost you must use 127.0.0.1 instead." - php.net/manual/en/mysqli.quickstart.connections.php. So basically something is not working with connecting to the Unix domain sockets that allow lo...
What is the difference between 0.0.0.0, 127.0.0.1 and localhost?
...
127.0.0.1 is normally the IP address assigned to the "loopback" or local-only interface. This is a "fake" network adapter that can only communicate within the same host. It's often used when you want a network-capable application to only serve clien...
Linux下追踪程序退出(崩溃)思路 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...加入以下代码：
PS1="`whoami`@`hostname`:"'[$PWD]'
history
USER_IP=`who -u am i 2>/dev/null| awk '{print $NF}'|sed -e 's/[()]//g'`
if [ "$USER_IP" = "" ]
then
USER_IP=`hostname`
fi
if [ ! -d /tmp/dbasky ]
then
mkdir /tmp/dbasky
chmod 777 /tmp/dbasky
fi
if [ ! -d /tmp/dbasky/${LO...