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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！
...况下，有LWT遗嘱机制，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...
京东618：算法让UV价值提升200%+，用智能卖场缩短购物路径 - 更多技术 - 清...
...，但实时的挑战和投入需求都很大，如何决定实时推荐和离线推荐的使用？
智能卖场团队：实际上我们目前已经很好地支持了实时推荐，并且经历过多次618和双11的考验。例如PC首页的猜你喜欢、APP首页的为你推荐等模块，都应...
Virtual Serial Port for Linux
...ms unstable. I don't know for sure but I think it crashed a machine in the office I was working on from home. I can't check until I'm back in the office on monday.
The second thing is that TIOCMIWAIT does not work. The code seems to be copied from some "tiny tty" example code. The handling of TIOCM...
Generating CSV file for Excel, how to have a newline inside a value
...xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns="http://www.w3.org/TR/REC-html40">
<head>
<style>
<!--
br {mso-data-placement:same-cell;}
-->
</style&g...
Shortcut to Apply a Formula to an Entire Column in Excel [closed]
...
Works perfectly in LibreOffice Calc as well, +1.
– Jonah
Feb 26 '13 at 19:13
6
...
How do I convert an interval into a number of hours with postgres?
...xtracting epoch implicitly assumes that one month = 30 days and one year = 365.25 days.
– Teddy
Jul 26 '17 at 8:58
@Te...
How do I find the time difference between two datetime objects in python?
...>> years = divmod(duration_in_s, 31536000)[0] # Seconds in a year=365*24*60*60 = 31536000.
Duration in days
>>> days = duration.days # Build-in datetime function
>>> days = divmod(duration_in_s, 86400)[0] # Seconds in a day = 86400
Duratio...
Git Tag list, display commit sha1 hashes
...base
bfc7747c4cf67a4aacc71d7a40337d2c3f73a886 refs/tags/v3.4.0.13-base
79ba365e75a4f9cee074d25a605a26acb660b7de refs/tags/v3.4.0.13-ga
However, some experimentation with "git show" resulted in this command:
% git show --summary --oneline --decorate v3.4.0.13-ga v3.4.0.13-base
79ba365 (tag: v3.4.0...
How to calculate date difference in JavaScript?
...tile year, of timezone, and some days have 23 or 25 hours. Some years have 365,25 days, so there is no simple arithmetic here (still looking for an accurate solution).
– Alexandre Salomé
May 20 '14 at 12:50
...
普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...你会发现他们可能是“一年工作经验用八年”。他们用的工具是一万年的Eclipse（甚至不愿意接受新版本的Eclipse）；他们的编码风格非常具有浓郁的“历史感”；他们习惯用一些“自己”（或者公司的）一些“框架”来做开发。...