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mqtt协议一般最大支持订阅几个主题？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...般几十到几百。以下来自AI的回答。
这是一个非常好的问题，但它没有一个简单的固定数字作为答案。MQTT协议规范本身并没有硬性规定一个客户端可以订阅主题的最大数量。这个限制主要取决于以下三个方面：MQTT代理（Broker...
求大佬解答 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
这种情况是什么问题啊大概率是由于屏幕名称不符合要求，请提供一下aia具体看看。
ble蓝牙怎么接收中文 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...？
英文能正常显示，中文乱码，那肯定就是字符集编码问题了。
详见：https://www.fun123.cn/reference/iot/bluetooth_codec.html
保证单片机侧和App侧一致的中文编码方式即可。盲猜BLE中应该是UTF8编码，单片机GB2312编码。
Runtime Error java.lang.NoSuchMethodError: No virtual method append(Lj...
....android.art/ javalib/core-oj.jar)
原因：过长的文本导致的问题，4w+汉字。
NodeJS: Saving a base64-encoded image to disk
...
UPDATE
I found this interesting link how to solve your problem in PHP. I think you forgot to replace space by +as shown in the link.
I took this circle from http://images-mediawiki-sites.thefullwiki.org/04/1/7/5/6204600836255205.png as sample which looks like:
Next I put it through htt...
Nginx no-www to www and www to no-www
... example
location / {
rewrite ^/cp/login?$ /cp/login.php last;
# etc etc...
}
}
Note: I have not originally included https:// in my solution since we use loadbalancers and our https:// server is a high-traffic SSL payment server: we do not mix https:// an...
Should MySQL have its timezone set to UTC?
...negative values from FROM_UNIXTIME
Sources:
https://bugs.mysql.com/bug.php?id=68861
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html
http://dev.mysql.com/doc/refman/5.1/en/datetime.html
http://en.wikipedia.org/wiki/Coordinated_Universal_Time
http://shafiqissani.wordpress.com/2...
Nginx 403 forbidden for all files
I have nginx installed with PHP-FPM on a CentOS 5 box, but am struggling to get it to serve any of my files - whether PHP or not.
...
Sort an Array by keys based on another Array?
Is it possible in PHP to do something like this? How would you go about writing a function? Here is an example. The order is the most important thing.
...
MySQL: Fastest way to count number of rows
...ach time you try to count all rows. (based on primary key's column)
Using PHP to count rows is not very smart, because you have to send data from mysql to php. Why do it when you can achieve the same on the mysql side?
If the COUNT(*) is slow, you should run EXPLAIN on the query, and check if inde...