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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！
...种。应用案例TCP用于许多互联网应用程序，如WWW、email、FTP、SSH、P2P、流媒体。MQTT也是基于TCP的。MQTT可以用于物联网数据传输、IM聊天软件等。
二、mqtt协议的特点mqtt提供了qos0、qos1和qos2的不同的消息发送的服务质量，简化了...
How to elegantly rename all keys in a hash in Ruby? [duplicate]
... "apple",
# "b" => "boss",
# "c" => "cat",
# "c1" => "cat 1"
# }
# => {"apple"=>"a val", "boss"=>"b val", "cat"=>{"cat 1"=>"c1 val", "c2"=>"c2 val"}, "d"=>"d val"}
#
class Hash
def rename_keys(map...
Why is a 3-way merge advantageous over a 2-way merge?
...ed by two people, one adding moose, one adding mouse.
#File a
dog
cat
#diff b, a
dog
+++ mouse
cat
#diff c, a
dog
+++ moose
cat
Now, if we merge the changesets as we apply them, we will get (3-way merge)
#diff b and c, a
dog
+++ mouse
+++ moose
cat
But if we a...
What is the use of static constructors?
...y the runtime the first time it is needed (the exact rules there are complicated (see "beforefieldinit"), and changed subtly between CLR2 and CLR4). Unless you abuse reflection, it is guaranteed to run at most once (even if two threads arrive at the same time).
...
Retrieve database or any other file from the Internal Storage using run-as
...un the following command:
adb exec-out run-as debuggable.app.package.name cat databases/file > file
To download multiple files in a folder under the /data/data/debuggable.app.package.name/ at once - use tar:
adb exec-out run-as debuggable.app.package.name tar c databases/ > databases.tar
a...
Two way sync with rsync
...es on the receiving side that are excluded (see --exclude) rsync.samba.org/ftp/rsync/rsync.html
– Mr_Moneybags
Sep 17 '13 at 4:53
2
...
Using fonts with Rails asset pipeline
...
Step 2 should be removed. According to Rails Guides, config.assets.paths is for Sprockets references, not relevant here. config.assets.precompile is also useless because "The default matcher for compiling files includes application.js, application.css ...
[SOLVED] Can't send payload > 23bytes(MTU setted to 128bytes) - #9 by ...
...y: #222222;
--secondary: #ffffff;
--tertiary: #0088cc;
--quaternary: #e45735;
--highlight: #ffff4d;
--success: #009900;
}
}
/* then deal with dark scheme */
@media (prefers-color-scheme: dark) {
...
Does Typescript support the ?. operator? (And, what's it called?)
...an't find any reference to it whatsoever in the TypeScript language specification.
As far as what to call this operator in CoffeeScript, it's called the existential operator (specifically, the "accessor variant" of the existential operator).
From CoffeeScript's documentation on Operators:
The ...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
...2B92FAB53DB28520D859CE0EF6B7D83D40AA1C1DCE2C0720D15A0F531595CAD81BA5D129F91CC6769719F1435872C4BCD0521150A0263B470066489B918BFCA03CE8A0E9FC2C0314C4B096EA30717C03C28CA29E678E63D78ACA1E9A63BDB1261EE7A0B041AB53746D68B57B68BEF37B71382838C95DA8557841A3CA58109F0B4F77A5E929B1A25DC2D6814C55DC0F81CD2F4E5DB95E...