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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》
Error 507: unable to connect. is the device turned on? 无法连接，设备...
...rror-507-unable-to-connect/1474
BluetoothClient 组件仅支持支持串行端口配置文件 (SPP) 的设备。如果您的设备通过除 SPP UUID 之外的 UUID 支持 RFCOMM，则需要使用 ConnectWithUUID 块并指定设备所需的 UUID。
该方法采用两个参数。第一个是蓝牙...
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。
Sanitizing strings to make them URL and filename safe?
...OU
echo normal_chars('üÿÄËÏÖÜŸåÅ'); // uyAEIOUYaA
Based on the selected answer in this thread: URL Friendly Username in PHP?
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How to test which port MySQL is running on and whether it can be connected to?
... I thought to be externally visible, it had to be the machine's own IP address and that 0.0.0.0 means the service is not available from anywhere. Do I have that wrong? I have a box running MySQL, the firewall has 3306 open from any IP address but MySQL is refusing the connection, I thought b...
What is the difference between OpenID and SAML?
...lly has to be coded in advance and you federate your application with only selected identity providers. It is possible to narrow the list of accepted OpenID identity providers but I think this would be against the general OpenID concept.
With OpenID you accept identities coming from arbitrary serve...
Emacs bulk indent for Python
...
I use the following snippet. On tab when the selection is inactive, it indents the current line (as it normally does); when the selection is inactive, it indents the whole region to the right.
(defun my-python-tab-command (&optional _)
"If the region is active, s...
WITH CHECK ADD CONSTRAINT followed by CHECK CONSTRAINT vs. ADD CONSTRAINT
...CREATE TABLE T2 (FKID INT, SomeOtherVal CHAR(2));
INSERT T1 (ID, SomeVal) SELECT 1, 'A';
INSERT T1 (ID, SomeVal) SELECT 2, 'B';
INSERT T2 (FKID, SomeOtherVal) SELECT 1, 'A1';
INSERT T2 (FKID, SomeOtherVal) SELECT 1, 'A2';
INSERT T2 (FKID, SomeOtherVal) SELECT 2, 'B1';
INSERT T2 (FKID, SomeOtherVal...