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MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
1、开源技术选型：
EMQX：https://github.com/emqx/emqx
Mosquitto：https://github.com/eclipse/mosquitto
Mosquitto 不支持分布式集群，但C/C++写的更高效，200KB内存占用，几乎可以运行在一切平台之上，包括树莓派，可以作为小型的消息网关，...
How does “make” app know default target to build if no target is specified?
... top of your make file:
.PHONY: default
default: mytarget ;
References:
https://www.gnu.org/software/make/manual/html_node/How-Make-Works.html
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@ character before a function call
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What is the difference between build.sbt and build.scala?
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HTTP test server accepting GET/POST requests
...
https://httpbin.org/
It echoes the data used in your request for any of these types:
https://httpbin.org/anything Returns most of the below.
https://httpbin.org/ip Returns Origin IP.
https://httpbin.org/user-agent Returns us...
What are the Ruby File.open modes and options?
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Type hinting a collection of a specified type
...ll provide a standardized syntax for type hints via function annotations.
https://www.python.org/dev/peps/pep-0484/
As referenced in the PEP, there is an experimental type-checker (kind of like pylint, but for types) called mypy that already uses this standard, and doesn't require any new syntax. ...
Is there a literal notation for an array of symbols?
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Why does the JVM still not support tail-call optimization?
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Need command line to start web browser using adb
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