Brother 1218w Driver
A Brief, but Practical Introduction to the MQTT Protocol and its Application to IoT
MQTT is a standardised publish/subscribe messaging protocol. It was designed in 1999 for use on satellites and as such is very light-weight with low bandwidth requirements making it ideal for M2M or IoT applications. As such, it has become one of the most common protocols for those situations.
What follows is a brief introduction to the protocol and some examples of its use. It is not intended to be a comprehensive reference on MQTT, but it should give enough information to get developers up and running. If you’re looking for a more complete discussion of the protocol, HiveMQ have published a series of articles available here.
Publish / Subscribe
The publish / subscribe (often called pub-sub) pattern lies at the heart of MQTT. It’s based around a message broker, with other nodes arranged around the broker in a star topology. This is a very different model to the standard client/server approach, and at first it might seem a little strange, but the decoupling it provides is a huge advantage in many situations.
Clients can publish or subscribe to particular topics which are somewhat like message subjects. They are used by the broker to decide who will receive a message. Topics in MQTT have a particular syntax. They are arranged in a hierarchy using the slash character (/) as a separator, much like the path in a URL. So a temperature sensor in your kitchen might publish to a topic like ‘sensors/temperature/home/kitchen’.
Let’s look at an example: Imagine a weather service which has a network of internet connected temperature sensors all over the world. All of these sensors maintain a connection to a broker and every ten minutes, they report the current temperature. They publish to a particular topic based on their location in the following format:
So a sensor on Baker Street in London would publish to ‘sensors/temperature/uk/london/baker_street’ with a message containing the current temperature.
Never giving up iguana from BBC Planet Earth II
这段视频来自 BBC《Planet Earth 地球脉动 II》，BBC纪录片导演保Paul Williams把刚出生不久的鬣蜥成功到达目的地的励志景象“拍出了史诗大片的感觉”。由于该视频在世界瞬间广为流传，2017 年 5 月 15 日，英国学院奖（BAFTA）将“最佳瞬间”（Virgin TV's Must See Moment）奖，颁给了这惊心动魄的 2 分钟。这段视频浓缩了好莱坞大片的所有要素，能给人传递一种震撼的励志力量。
 This Planet Earth 2 iguana vs. snake scene plays out like a chase from The Bourne Identity
We spoke to the editor of the scene being hailed as potentially the 'greatest TV moment ever'
 The iguana v snakes chase gives Planet Earth II its first breakout moment
The nailbiting showdown between the racer snakes and baby iguana of Fernandina island on the BBC nature show was already impressive – but then the internet got hold of it
I am guessing that in the great battle of racer snakes v marine iguana, you were on the side of the iguana. It’s hard to find people who were cheering on the snakes of Fernandina island during Sunday night’s episode of Planet Earth II. In the standout scene of the show, one baby iguana, just hatched, starts its run as dozens of chaser snakes emerge, like ropes thrown out of the rocks, slaloming across the shingle, red tongues zipping and unzipping mouth holes.
To remember the Keyboard Shortcuts is a great way to improve programming efficiency. The following is a useful "LabVIEW Quick Reference Card" which includes the most useful shortkeys of Labview.Labview-Quick-Reference-Card.pdf (下载416)
Visual Studio.net 工程更换机器编译时遇到”GenerateResource任务意外失败“的解决方法：
Editplus SQL 语法文件
The BIG Talk ：智能机器人&对话沃兹尼亚克
演讲者：Hod Lipson，康奈尔大学创意机器人实验室主任；斯蒂夫·盖瑞·沃兹尼亚克（Stephen Gary Wozniak），硅谷神奇巫师沃兹（Wonderful Wizard of Woz），曾与史蒂夫·乔布斯合伙创立苹果公司。
By the way, note: 实验室的3D打印机可以使用了。