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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 ...
https://bbs.tsingfun.com/thread-1674-1-1.html 

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》
https://bbs.tsingfun.com/thread-1828-1-1.html 

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...
https://www.fun123.cn/reference/iot/MQTTGuide.html 

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...
https://bbs.tsingfun.com/thread-2367-1-1.html 

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。
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Add spaces before Capital Letters

Given the string "ThisStringHasNoSpacesButItDoesHaveCapitals" what is the best way to add spaces before the capital letters. So the end string would be "This String Has No Spaces But It Does Have Capitals" ...
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Why can't C++ be parsed with a LR(1) parser?

... I'm quite puzzled by the citation extracted from a PhD Thesis. If there is an ambiguïty, then, by definition, NO lookahead may ever "resolve" the ambiguity (i.e. decide which parse is the correct oen, as at least 2 parses are considered correct by the gramma...
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How to upper case every first letter of word in a string? [duplicate]

I have a string: "hello good old world" and i want to upper case every first letter of every word, not the whole string with .toUpperCase(). Is there an existing java helper which does the job? ...
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Count occurrences of a char in a string using Bash

I need to count the number of occurrences of a char in a string using Bash. 7 Answers ...
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difference between socket programming and Http programming

...istent connections are available) MSDN example: public static void Main (string[] args) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create (args[0]); HttpWebResponse response = (HttpWebResponse)request.GetResponse (); Console.WriteLine ("Content length is {0}", response.Cont...