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MQTT支持获取设备端的在线状态吗？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
mqtt拓展支持获取设备端的在线状态吗？这里仅仅提供一个思路：
设备状态是设备的一项数据，这个也需要设备上报其状态数据给app端，类似网络的心跳包，定时上报状态数据，一定时间没取到数据就认为设备离线。
micro:bit 连接报错 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...错了。
运行故障
java.lang.ExceptionInInitializerError at edu.mit.appinventor.ble.BluetoothLEint$BLEReadOperation.subscribeBluetoothLEint.java:357) at
edu.mit.appinventor.ble.BluetoothLEintSBLEReadOperation.run(BluetoothLEint.java:325) at android.os.Handler.handleCallback(Handler.java:1013) ...
Most used parts of Boost [closed]
...smart ptrs
Boost was a massive help when I wrote my first cross-platform app - without it I really would have struggled.
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In Swift how to call method with parameters on GCD main thread?
In my app I have a function that makes an NSRURLSession and sends out an NSURLRequest using
9 Answers
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How to get all columns' names for all the tables in MySQL?
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that was what i was looking for :-) Wrote a java app doing the same stuff by now
– dieter
Apr 13 '11 at 11:57
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Can you use @Autowired with static fields?
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any idea how I can use this approach when initializing a repository?
– kiedysktos
Mar 8 '17 at 11:47
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How to set session timeout in web.config
...how to set session timeout value for in-process session for an ASP.Net web application.
5 Answers
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Get current URL of UIWebView
...Thanks for pointing people to Matt's answer below.
– App Dev Guy
Nov 30 '15 at 6:38
add a com...
Fast and Lean PDF Viewer for iPhone / iPad / iOS - tips and hints?
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I have build such kind of application using approximatively the same approach except :
I cache the generated image on the disk and always generate two to three images in advance in a separate thread.
I don't overlay with a UIImage but instead draw t...
Turn off iPhone/Safari input element rounding
...nd later:
input {
border-radius: 0;
}
input[type="search"] {
-webkit-appearance: none;
}
If you must only remove the rounded corners on iOS or otherwise for some reason cannot normalize rounded corners across platforms, use input { -webkit-border-radius: 0; } property instead, which is stil...