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纯血鸿蒙 spp ble tcp 通信组件进展 - HarmonyOS NEXT - 清泛IT社区，为创新赋能！
spp ble tcp 通信组件基础功能已调通，细节待深入测试。mqtt 正在测试中。
手机App控制Arduino：米思齐+App Inventor2蓝牙实战教程（图文） - 创客硬...
...就是最朴素的"通信协议"，理解了它，BLE、WiFi、MQTT都是同一思路的不同通道。
常见问题速查
• 连接失败 → 先在系统蓝牙里配对
• 程序上传失败 → 上传时拔掉D0/D1
• 指令无反应 → 检查两边波特率是否都是9600
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App Inventor 2 数学代码块 · App Inventor 2 中文网
... (bitwise or Exclusive)
列表中出现次数最多的元素 (mode)
拓展案例：
案例：文本转数字
案例：数字转文本
案例：指定将二进制的某一位(Bit)改为1
案例：指定将二进制的某一位(Bit)改为0
内置块中找不到你要查找的数学...
comparing 2 strings alphabetically for sorting purposes
...ype.sort()
Keep in mind that sorting is locale dependent. E.g. in German, ä is a variant of a, so "ä".localeCompare("b", "de-DE") returns -1. In Swedish, ä is one of the last letters in the alphabet, so "ä".localeCompare("b", "se-SE") returns 1.
Without the second parameter to localeCompare, t...
SQL select join: is it possible to prefix all columns as 'prefix.*'?
... answered Oct 22 '14 at 3:43
Xiè JìléiXiè Jìléi
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How to highlight text using javascript
... &amp; for &, &lt; for <, &gt; for >, &auml; for ä, &ouml; for ö &uuml; for ü &szlig; for ß, etc.
What you need to do:
Loop through the HTML document, find all text nodes, get the textContent, get the position of the highlight-text with indexOf (with an opt...
Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
...ered Dec 15 '10 at 9:47
Jan ThomäJan Thomä
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How do you do a case insensitive search using a pattern modifier using less?
...ed Aug 19 '08 at 20:09
Juha SyrjäläJuha Syrjälä
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\d is less efficient than [0-9]
...??????????????????????????????????????????????????????
OtherNumber
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Azure table storage returns 400 Bad Request
...hey don't get populated with the default values.
Have a look at Juha Palomäki's answer below as well... there sometimes is a slightly more useful message in the exception where he suggests (RequestInformation.ExtendedErrorInformation.ErrorMessage)
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