MQTT is one of the four data connection methods supported by the ThingJS platform. MQTT is also known as Message Queuing Telemetry Transport. It is a message protocol based on Publish or Subscribe paradigm under ISO standard (ISO/IEC PRF 20922), which can be regarded as a "bridge of data transmission". MQTT is a lightweight protocol. The center of the MQTT protocol is the broker (server/broker).

The cost of development and construction is more than ten times more expensive to make an APP than to make an H5 website with the same function. Due to the need to develop dual systems of Apple and Android, that is, to develop two clients, the cost is doubled on the original basis.

Have a dream, have dry goods, wechat search [big move world] pay attention to this in the wee hours of the morning is still brushing the dishes of the wisdom. This article has been included on GitHub.

With the power of the Angular dependency injection system, you can fake specific use cases. This is useful for automated testing, but in this article, we'll look at a way to use it for manual testing.

In the early stage of learning Japanese, I found it not easy to memorize fifty tones of Japanese, especially Katakana. Then I thought, what if there was an app that could make the most of all that time? I could practice fifty notes on my lunch break or on the subway. So search the App Store, there are a lot of small software of 50 sound learning, but the Store software is not containing internal purchase, with advertising, is often more than 40M, did not find a satisfactory should...

In the daily use of the Internet products, many are to complete the interaction of the front and back end data, when it comes to data interaction, we have to mention Ajax and WebSocket, they are the data interaction of the sharp tools, then what are they? Ajax was covered in the last article, but what about WebSocket? WebSocket is a new HTML5 protocol that realizes the full duplex communication between the browser and the server. To establish a WebSocket connection, the client...

As the "most popular" cross-platform and cross-terminal (hardware) development language, HTML5 has been paid more and more attention by front-end developers. Whether it is PC terminal or the current "hot" mobile terminal, the proportion of front-end developers is getting higher and higher. The increase in HTML5 developers naturally leads to a decrease in the number of front-end developers such as WPF/Flex/QT. To solve the "cross-platform" problem of the front end and the scarcity of developers...

This article introduces the second method. In the SAP UI5 project, create a new lib folder and put the third party library files in it. Then define the references to the third party library files in the SAP. UI5 section of the manifest.

A friend on StackOverflow has a problem with lazy loading a Component in the Feature Module: Notice in line 9 of the figure above that CommonModule is imported. The Component template file that is lazily loaded uses the Async pipe, which is now in CommonModule. However, because this module is lazily loaded, it is not statically defined in the feature Module's decl...

[Soft Skills] Have you ever learned about VR? In The Analects of Confucius, Confucius Zeng said, "I examine myself three times every day." (I reflect on myself many times every day.) Front-end interview 3+1 questions a day, interview questions to drive learning, progress a little every day! Let efforts become a habit, let the struggle to become a kind of enjoyment! Believe in the power of persistence!! Welcome to discuss and learn with friends at Issues! [Recommended] Welcome to work with Jsliang on the front end...