大约有 900 项符合查询结果（耗时：0.0226秒） [XML]
阿里云物联网平台开通及基础用法 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...添加产品和创建设备完成后，可以在设备的详情页中获得MQTT协议所需的三元组，点击MQTT连接参数后的查看即可获得。
部分截图来自：https://blog.csdn.net/HDUGEEK/article/details/129673434
- App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...消息体大小的限制，文档中没有描述这个限制，但是每个MQTT平台应该是有限制的，经过实际测试befa.com平台，base64文本大小约100KB以内的消息订阅可以正常接收，超过则无法接收。建议你自己的平台也进行一下测试，如果有限制...
How to move screen without moving cursor in Vim?
...line
Ctrl-e Moves screen down one line
Ctrl-u Moves cursor & screen up ½ page
Ctrl-d Moves cursor & screen down ½ page
Ctrl-b Moves screen up one page, cursor to last line
Ctrl-f Moves screen down one page, cursor to first line
Ctrl-y and Ctrl-e only change the cursor position if it woul...
Difference between Char.IsDigit() and Char.IsNumber() in C#
...d 2 and 3 ('²' and '³') and the glyphs that are fractions such as '¼', '½', and '¾'.
Note that there are quite a few characters that IsDigit() returns true for that are not in the ASCII range of 0x30 to 0x39, such as these Thai digit characters: '๐' '๑' '๒' '๓' '๔' '๕' '๖' '๗' ...
Where can I download english dictionary database in a text format? [closed]
...purpose dictionary you can look up most words in.
– Lèse majesté
Dec 28 '12 at 2:50
2
The Objec...
Regular expression to match DNS hostname or IP Address?
... Non-latin (Punycoded) hostnames must be converted to ASCII form first (éxämplè.com = xn--xmpl-loa1ab.com) and then validated.
– Alix Axel
Jul 21 '13 at 8:36
6
...
How to unescape HTML character entities in Java?
... @NickFrolov, your comments seem a bit messed up. auml is for instance ä and not д.
– aioobe
Oct 17 '16 at 1:52
|
show 3 more comments...
How does facebook, gmail send the real time notification?
...
Facebook uses MQTT instead of HTTP. Push is better than polling.
Through HTTP we need to poll the server continuously but via MQTT server pushes the message to clients.
Comparision between MQTT and HTTP: http://www.youtube.com/watch?v=-K...
Generating random whole numbers in JavaScript in a specific range?
...
I realize this is about 2½ years later, but with the input 1 and 6 your function returns values 1,2,3,4 and 5, but never a 6, as it would if it was "inclusive".
– some
Feb 2 '12 at 22:45
...
What is self-documenting code and can it replace well documented code? [closed]
...is being done:
/* compute displacement with Newton's equation x = vₒt + ½at² */
const float gravitationalForce = 9.81;
float timeInSeconds = 5;
float displacement = (1 / 2) * gravitationalForce * (timeInSeconds ^ 2);
And the final version of code as documentation with zero comments needed:
f...