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UrsPahoMqttClient心跳问题解决——Paho底层已自动处理，设好KeepAlive就行...
问一下心跳PingReq报文怎么发的
目的为保持 MQTT 连接，否则会被踢下线。
用的是什么MQTT扩展？UrsPahoMqttClient。
结论：不需要手动发心跳，Paho底层已内置实现
UrsPahoMqttClient 封装的是 Eclipse Paho MQTT 客户端，心跳（PingReq）...
运动软件设计问题 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
本帖最后由 wwwwwwwwwwww 于 2026-07-03 10:55 编辑
我要做一个运动软件，里面有一个轨迹图功能，我应该怎么做出来？需要用什么组件？而且我需要怎么处理运动距离过远的时候缩放和自动保存？
地图相关组件，画线组件，地图本...
pass post data with window.location.href
...n attribute of the form to the URL and the method attribute to POST, then call the submit method on the form tag.
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Why do people say that Ruby is slow? [closed]
I like Ruby on Rails and I use it for all my web development projects. A few years ago there was a lot of talk about Rails being a memory hog and about how it didn't scale very well but these suggestions were put to bed by Gregg Pollack here.
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Using Default Arguments in a Function
...= "some other value";
}
code here!
}
This way, you can make a call like foo('blah', null, 'non-default y value'); and have it work as you want, where the second parameter $x still gets its default value.
With this method, passing a null value means you want the default value for one par...
技术人员如何创业《三》- 合伙人的分工 - 资讯 - 清泛网 - 专注C/C++及内核技术
...政打点生活和后勤、技术作为先锋开发软件。这里就有个问题了，很多时候一个想法并不能变成一个产品。比如，我要研发一个记录笔记的软件，可以支持本地和在线，还支持交流分享。一句话需求如何去实现呢？在boss的眼里...
JavaScript implementation of Gzip [closed]
I'm writing a Web application that needs to store JSON data in a small, fixed-size server-side cache via AJAX (think: Opensocial quotas ). I do not have control over the server.
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那些年 O2O创业我踩了十个坑 - 资讯 - 清泛网 - 专注C/C++及内核技术
...此一来，公司团队看似整齐而豪华，但内部却出现了很多问题，由于大家背景各异，来自于国企、外企和民企，处事风格完全迥异，很多事情在讨论中反复，反复后再讨论，浪费了大量的时间在开会和制定战略中，而且大家的价...
ie8 var w= window.open() - “Message: Invalid argument.”
...n you look at the official documentation page, you see that Microsoft only allows the following arguments, If using that argument at all:
_blank
_media
_parent
_search
_self
_top
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Convert PDF to clean SVG? [closed]
...t they often lose the font data, but don't seem to approximate a good, installed font. How does PDF display it if SVG can't?
– DanRedux
Apr 23 '12 at 21:30
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