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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
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1、硬件接线（特别注意：VCC 3.3v 或 5v 请参阅说明书，不要弄错以免烧坏硬件）
2、串口工具测试
什么是串口工具？
测试与BLE硬件通信（数据透传）
AT控制指令
IO口控制
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How do I pass data between Activities in Android application?
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1314
The easiest way to do this would be to pass the session id to the signout activity in the Inte...
C# nullable string error
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304
System.String is a reference type and already "nullable".
Nullable<T> and the ? suffix ...
Stop handler.postDelayed()
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Juan José Melero Gómez
2,53711 gold badge1414 silver badges3030 bronze badges
answered Mar 28 '14 at 17:05
RaghunandanRaghunand...
Why can't enum's constructor access static fields?
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113
The constructor is called before the static fields have all been initialized, because the static...
How can I use Spring Security without sessions?
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In Spring Security 3 with Java Config, you can use HttpSecurity.sessionManagement():
@Override
protected void configure(final HttpSecurity http) throws Exception {
http
.sessionManagement()
.sessionCreationPolicy(Sessio...
Modifying a query string without reloading the page
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answered Oct 9 '13 at 18:05
Fabio NolascoFabio Nolasco
5,14255 gold badges2828 silver badges3131 bronze badges
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How to remove leading zeros using C#
... that convert through IntXX) methods will not work for:
String s = "005780327584329067506780657065786378061754654532164953264952469215462934562914562194562149516249516294563219437859043758430587066748932647329814687194673219673294677438907385032758065763278963247982360675680570678407806473296472036...