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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！
...机制，通知相应topic的订阅者客户端已经离线了。7. 正如https之于http，mqtts支持TLS安全，保证数据传输过程的安全性。8. mqtt协议轻巧、简单，容易实现，mqtt客户端哪怕在单片机中也可以运行。这一点在物联网应用中挺重要的，因...
UILabel - auto-size label to fit text?
..., my category lets a UILabel stretch it's height to show all the content: https://gist.github.com/1005520
Or check out this post: https://stackoverflow.com/a/7242981/662605
This would stretch the height, but you can change it around easily to work the other way and stretch the width with somethin...
What's the difference between $evalAsync and $timeout in AngularJS?
...
I recently answered essentially this question here: https://stackoverflow.com/a/17239084/215945
(That answer links to some github exchanges with Misko.)
To summarize:
if code is queued using $evalAsync from a directive, it should run after the DOM has been manipulated by A...
How to access the request body when POSTing using Node.js and Express?
...t?
If you don't want to use the bodyParser check out this other question: https://stackoverflow.com/a/9920700/446681
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val-mutable versus var-immutable in Scala
...eUploader: {
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Are there other whitespace codes like   for half-spaces, em-spaces, en-spaces etc useful in HTML
...eUploader: {
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using lodash .groupBy. how to add your own keys for grouped output?
...) => ({ color: key, users: value }))
.value()
);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>
Original Answer
var result = _.chain(data)
.groupBy("color")
.pairs()
.map(function(currentItem) {
retur...
Setting unique Constraint with fluent API?
..., you can use HasIndex() to add indexes for migration through fluent API.
https://github.com/aspnet/EntityFramework6/issues/274
Example
modelBuilder
.Entity<User>()
.HasIndex(u => u.Email)
.IsUnique();
On EF6.1 onwards, you can use IndexAnnotation() to add indexes for m...
json_encode/json_decode - returns stdClass instead of Array in PHP
...oser look at the second parameter of json_decode($json, $assoc, $depth) at https://secure.php.net/json_decode
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Is it possible to start a shell session in a running container (without ssh)
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Keep an eye on this pull request: https://github.com/docker/docker/pull/7409
Which implements the forthcoming docker exec <container_id> <command> utility. When this is available it should be possible to e.g. start and stop the ssh service inside...