http://blog.csdn.net/YAJUN0601/article/details/41981399
MQTT is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol. It was designed as an extremely lightweight publish/subscribe messaging transport. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium. For example, it has been used in sensors communicating to a broker via satellite link, over occasional dial-up connections with healthcare providers, and in a range of home automation and small device scenarios. It is also ideal for mobile applications because of its small size, low power usage, minimised data packets, and efficient distribution of information to one or many receive
开源版本：
http://mosquitto.org/download/
$ brew install mosquitto
==> Installing dependencies for mosquitto: c-ares, openssl
==> Installing mosquitto dependency: c-ares
==> Downloading http://c-ares.haxx.se/download/c-ares-1.10.0.tar.gz
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==> ./configure --prefix=/usr/local/Cellar/c-ares/1.10.0
==> make install
� /usr/local/Cellar/c-ares/1.10.0: 57 files, 540K, built in 2.0 minutes
==> Installing mosquitto dependency: openssl
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/openssl-1.0.1j.yosemite.bottle.tar.gz
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==> Pouring openssl-1.0.1j.yosemite.bottle.tar.gz
==> Caveats
A CA file has been bootstrapped using certificates from the system
keychain. To add additional certificates, place .pem files in
/usr/local/etc/openssl/certs
and run
/usr/local/opt/openssl/bin/c_rehash
This formula is keg-only, which means it was not symlinked into /usr/local.
Mac OS X already provides this software and installing another version in
parallel can cause all kinds of trouble.
Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries
Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:
LDFLAGS: -L/usr/local/opt/openssl/lib
CPPFLAGS: -I/usr/local/opt/openssl/include
==> Summary
� /usr/local/Cellar/openssl/1.0.1j: 431 files, 15M
==> Installing mosquitto
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/mosquitto-1.3.5.yosemite.bottle.tar.gz
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==> Pouring mosquitto-1.3.5.yosemite.bottle.tar.gz
==> Caveats
mosquitto has been installed with a default configuration file.
You can make changes to the configuration by editing:
/usr/local/etc/mosquitto/mosquitto.conf
Python client bindings can be installed from the Python Package Index:
pip install mosquitto
Javascript client has been removed, see Eclipse Paho for an alternative.
To have launchd start mosquitto at login:
ln -sfv /usr/local/opt/mosquitto/*.plist ~/Library/LaunchAgents
Then to load mosquitto now:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mosquitto.plist
Or, if you don't want/need launchctl, you can just run:
mosquitto -c /usr/local/etc/mosquitto/mosquitto.conf
==> Summary
� /usr/local/Cellar/mosquitto/1.3.5: 26 files, 632K