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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
一、MQTT与TCP的区别诞生时间TCP协议诞生于1974年冷战期间。MQTT诞生于1999年互联网初期，TCP协议比MQTT协议诞生早了25年。Ashton提出IoT概念也是在1999年，因此MQTT协议生逢其时。当时MIT Auto-ID Labs的Kevin Ashton为了把宝洁的供应链上的RF...
如何获取IE (控件)的所有链接（包括Frameset, iframe） - 其他 - 清泛IT社...
来源：新浪博客
IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表：
CComPtr<IHTMLElement> body;
...
CComPtr<IDispatch> spDispCollection;
body->get_all(&spDispCollection);复制代码所以要获取iframe/frame(frameset) ...
Fastest way to serialize and deserialize .NET objects
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Here's your model (with invented CT and TE) using protobuf-net (yet retaining the ability to use XmlSerializer, which can be useful - in particular for migration); I humbly submit (with lots of evidence if you need it) that this is the fastest (or c...
App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
一、实验背景
向心力公式：F = m · r · ω²
即：向心力 = 质量 × 半径 × 角速度²
高中物理新课标要求学生通过实验探究向心力，但现有实验器材（手摇向心力演示仪）操作不便、精度低。本App利用手机内置传感器，实现...
BLE（一）概述&工作流程&常见问题 - 创客硬件开发 - 清泛IT社区，...
文章源自：https://www.gandalf.site/2018/11/ble.html
0x1 BLE概述“蓝牙”，即Bluetooth，是斯堪的纳维亚语中 Blåtand / Blåtann 的英化版本。该词是十世纪的一位国王Harald Bluetooth的绰号，相传他将纷争不断的丹麦部落统一为一个王国，并引...
Difference between core and processor
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Intel didn't invent the concept of simultaneous multithreading. Wikipedia says Alpha EV8 was the first major commercial implementation.
– Peter Cordes
Mar 28 '16 at 6:30
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Mockito: Inject real objects into private @Autowired fields
...t we were faced with the same problem when trying to inject Strings. So we invented a JUnit5/Mockito extension that does exactly what you want: https://github.com/exabrial/mockito-object-injection
EDIT:
@InjectionMap
private Map<String, Object> injectionMap = new HashMap<>();
@Befor...
Cartesian product of multiple arrays in JavaScript
...tation, upon brief inspection i couldn't or maybe it's just that i like re-inventing the wheel or solving classroom-like programming problems either way its your lucky day:
function cartProd(paramArray) {
function addTo(curr, args) {
var i, copy,
rest = args.slice(1),
last ...
MQTT报文多个数据的提取 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
想做个订阅MQTT，采集的APP，怎么才能正确的连接mqtt服务器并订阅主题，把对应的数据按顺序提取到标签1，标签2，标签3……我把画面和mqtt订阅的数据发上来，求解救！！
{
"RTValue": [
{
&nb...
What is the best way to detect a mobile device?
...e (with keyboard, or as touch screen)? If you did this before the iPad was invented, then you had to add it later to all your sites. Next OSs coming out: Ubuntu Mobile, FirefoxOS, Tizen... .This.Is.A.Bad.Idea.
– FrancescoMM
Jul 4 '13 at 9:58
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