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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...
MQTT接入EasyIoT平台 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...。
新建一个订阅主题。
代码差别主要在：地址、端口不同，且使用用户名、密码认证（这里仅仅是演示，隐藏了部分，以实际为准），订阅主题使用上面新建的。
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...
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...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...。
此属性可打开或关闭简单的调试消息。这些消息显示为 Toast 消息，并在几秒钟后消失。
在调试应用程序时打开此功能可查看数据库正在做什么。
此属性可打开或关闭简单调试消息。这些消息显示为带有“确定”按...
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 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...
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...
苹果全球开发者大会：无硬件 iOS 9等三大系统更新 - 资讯 - 清泛网 - 专注C...
...项Split View功能支持同时打开两个应用，并对半在屏幕上显示。四指上滑选择程序可以为每半个分屏选择显示的程序。另外，画中画功能支持在主屏幕上显示视频播放小窗口，用户甚至可以把视频图像隐藏起来，仅收听声音。
iOS...
Is GET data also encrypted in HTTPS?
...e url? If so, the statement is wrong. There is no way to hide the hostname/IP address from the ISP/proxy server in the same way you cannot hide the destination address while sending physical mail.
– Abhishek Anand
Mar 24 '14 at 21:23
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