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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！
...hton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RFID标签和互联网连接起来，在1999年第一个提出了IoT这个概念。发明人TCP协议的发明人是Vinton Cerf（下图左，曾在IBM工作过...
How to split data into training/testing sets using sample function
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@VedaadShakib when you use "-" it omit all the index in train_ind from your data. Take a look at adv-r.had.co.nz/Subsetting.html . Hope it helps
– dickoa
Aug 1 '16 at 22:05
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How can I check which version of Angular I'm using?
...arJS v1.0.6
* (c) 2010-2012 Google, Inc. http://angularjs.org
* License: MIT
*/
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How do I disable a href link in JavaScript?
...is solves the problem by editing your answer.
– Baum mit Augen♦
Sep 24 '14 at 16:16
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How do you version your database schema? [closed]
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I admit it took a while to get right but now it requires almost no effort to prep an upgrade and even less to perform one. Also, one thing I like is that I can do interim hotfix changes and it has no impact on the upgrade proced...
How to determine device screen size category (small, normal, large, xlarge) using code?
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@StanKurdziel The source code is published under the MIT open-source license and is available at: github.com/mportuesisf/ScreenInfo
– mmathieum
Oct 15 '12 at 23:46
How do I split a string into an array of characters? [duplicate]
...???????'] // —> ["????", "????", "????"]
For ES5, options are limited:
I came up with this function that internally uses MDN example to get the correct code point of each character.
function stringToArray() {
var i = 0,
arr = [],
codePoint;
while (!isNaN(codePoint = knownCha...
How do I “decompile” Java class files? [closed]
...ped
Krakatau: open-source (GPLv3) and actively developed
CFR: open-source (MIT) and actively developed
JAD
DJ Java Decompiler
Mocha
And many more.
These produce Java code. Java comes with something that lets you see JVM byte code (javap).
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Media Player called in state 0, error (-38,0)
...ng pause() on not playing player was my case
– stevo.mit
Mar 3 '15 at 20:59
calling mediaPlayer.isPlaying() in an inva...
Is there an easy way to request a URL in python and NOT follow redirects?
... requests library will save you a lot of headache.
– mit
May 5 '14 at 2:36
The link to "Dive Into Python" is dead.
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