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MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...4、MQTT测试客户端：
不用挑选了，就它 MQTTX：https://mqttx.app/zh
创建并发送BLE蓝牙广播 - 创客硬件开发 - 清泛IT社区，为创新赋能！
在MIT App Inventor社区的一篇帖子中，用户尝试使用最新的BLE扩展来创建和发送蓝牙广播，但遇到了一些问题。Evan Patton指出，Android的BLE子系统需要使用16位UUID，并提供了一个测试版的BLE扩展，解决了广播发送失败的问题。
以下...
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) ...
jQuery - prevent default, then continue default
...nd you do the things you want to do before returning (true), these things happen prior to the actual submission.
For example:
$('form').submit(function(){
alert('I do something before the actual submission');
return true;
});
Simple example
Another example on jquery.com: http://api.jque...
Automatically resize jQuery UI dialog to the width of the content loaded by ajax
...ation and examples on this. I've got a number of jQuery UI dialogs in my application attached to divs that are loaded with .ajax() calls. They all use the same setup call:
...
Good Java graph algorithm library? [closed]
...best choice. I really liked using its API, when I quickly had to write an app that was working on graph and displaying it later.
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Going from a framework to no-framework [closed]
...FILTER_CALLBACK line in your filter_input_array setup. Its whitelist-based approach to input security makes a great (and very powerful) first line of defense against XSS.
As far as I can tell, PHP doesn't come with a mechanism for protecting against cross-site request forgery, but I'm sure Google c...
How to pass the password to su/sudo/ssh without overriding the TTY?
...
I wrote some Applescript which prompts for a password via a dialog box and then builds a custom bash command, like this:
echo <password> | sudo -S <command>
I'm not sure if this helps.
It'd be nice if sudo accepted a pre-e...
When do items in HTML5 local storage expire?
.../Web/API/Window/localStorage
Of course, it's possible that something your application stores on the client may not be there later. The user can explicitly get rid of local storage, or the browser may run into space considerations. It's good to program defensively. Generally however things remain "...