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自己搭建的MQTT云服务器 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...题：每次打开我的APP后，要手动订阅一遍主题，才能收到ESP32推送的温度消息，显示在一个标签上，每秒钟刷新。但我一旦离开APP的页面，再切换回来时，又要手动订阅一遍，才能在标签上更新推送来的消息。请问这是什么原因...
那些曾被追捧的90后创业男神女神，还好吗？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...被熊孩子追坏了的小气球
有两个90后熊孩子，用气球将摄像机带到了高空中（具体多高小编没有细究，总之很高很高。。），为的是能够从最直观的视角来记录下地球表面活动。
此后这件事被优酷的编辑知晓，又逢当时优酷...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
...者开发动机
对于一个项目，应该开发一个与 ESP8266（项目）通信的 Android 应用程序。为了轻松开发应用程序，选择了 MIT App Inventor 2。
项目中可用的 ESP8266 设备的 IP 地址不应固定。应用程序本身应该确定哪些设备当前...
How to interpolate variables in strings in JavaScript, without concatenation?
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well you could do this, but it's not esp general
'I pity the $fool'.replace('$fool', 'fool')
You could easily write a function that does this intelligently if you really needed to
sha...
Sort an array in Java
...
Loops are also very useful to learn about, esp When using arrays,
int[] array = new int[10];
Random rand = new Random();
for (int i = 0; i < array.length; i++)
array[i] = rand.nextInt(100) + 1;
Arrays.sort(array);
System.out.println(Arrays.toString(array));
//...
how to check if object already exists in a list
...sing System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication3
{
public class myobj
{
private string a = string.Empty;
private string b = string.Empty;
public myobj(string a, string b)
{
this.a = a;
...
Best way to do nested case statement logic in SQL Server
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a user-defined function may server better, at least to hide the logic - esp. if you need to do this in more than one query
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follow
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How to set environment variable or system property in spring tests?
...are different from the environment variables that are more complex to set, esp. for tests. Thankfully, below class can be used for that and the class docs has good examples
EnvironmentVariables.html
A quick example from the docs, modified to work with @SpringBootTest
@SpringBootTest
public class...
Laravel 4: how to “order by” using Eloquent ORM [duplicate]
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I like this answer the best vs handling in-line, esp if you are handling multiple order conditions. Thanks! _.orderBy(this.users, ['name', 'last_login'], ['asc', 'desc'])
– kaleazy
Mar 22 '19 at 20:37
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How do I extract the contents of an rpm?
... try the rpm2cpio commmand? See the example below:
$ rpm2cpio php-5.1.4-1.esp1.x86_64.rpm | cpio -idmv
/etc/httpd/conf.d/php.conf
./etc/php.d
./etc/php.ini
./usr/bin/php
./usr/bin/php-cgi
etc
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