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MQTT支持获取设备端的在线状态吗？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
mqtt拓展支持获取设备端的在线状态吗？这里仅仅提供一个思路：
设备状态是设备的一项数据，这个也需要设备上报其状态数据给app端，类似网络的心跳包，定时上报状态数据，一定时间没取到数据就认为设备离线。
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...entor 期间，我发现了创建扩展的能力以及所有可用的各种免费和付费扩展。App Inventor 平台已经有一些可用的 SQLite 扩展，但各种选项都不能满足我的需求。
除了构建我的第一个 Android 应用之外，我还借此机会学习如何构建 App In...
How to create fixed space and flexible space bar button items programmatically?
... answered Mar 12 '16 at 9:36
365SplendidSuns365SplendidSuns
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CSV new-line character seen in unquoted field error
...) CSV files. These are text files that use CR for end of line. If using MS Office make sure you select either plain CSV format or CSV (MS-DOS). Do not use CSV (Macintosh) as save-as type.
My preferred EOL version would be LF (Unix/Linux/Apple), but I don't think MS Office provides the option to sa...
What is a vertical tab?
... This does also apply to OneNote (and probably every other MS Office Product with Word-like input). And contrary to @PraveenKumar, it does this when hitting Shift+Enter, not Ctrl+Enter. The latter does nothing, at least in my case.
– Griddo
Mar 17 ...
/data/user/0/xxxx/files（内部存储）和 /storage/emulated/0/Android/data...
...：
当需要存储以下内容时：
大型文件（如视频缓存、离线地图）。允许用户通过文件管理器查看（但不可修改）的文件。需要跨应用共享但不想使用 MediaStore 的文件（通过 FileProvider 共享）。
6. 代码示例(1) 写入内部存储
// ...
Set a cookie to never expire
...n ten years:
setcookie(
"CookieName",
"CookieValue",
time() + (10 * 365 * 24 * 60 * 60)
);
Note that if you set a date past 2038 in 32-bit PHP, the number will wrap around and you'll get a cookie that expires instantly.
...
Unable to load config info from /usr/local/ssl/openssl.cnf on Windows
...key = $dir/private/cakey.pem
default_days = 365
default_md = md5
preserve = no
email_in_dn = no
nameopt = default_ca
certopt = default_ca
policy = policy_ma...
Java HTTPS client certificate authentication
...
$ openssl genrsa -des3 -out ca.key 4096
$ openssl req -new -x509 -days 365 -key ca.key -out ca.crt
to generate your own CA certificate, and then generate and sign the server and client keys via:
$ openssl genrsa -des3 -out server.key 4096
$ openssl req -new -key server.key -out server.csr
$...
Get person's age in Ruby
I'd like to get a person's age from its birthday. now - birthday / 365 doesn't work, because some years have 366 days. I came up with the following code:
...