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03 ° ZigBee sensor network - smoke sensor Experimental phenomenon: smoke sensor is similar to photosensitive sensor detection method; terminal node collects smoke signal, and After the coordinator is networked, the collected data is sent to the coordinator, and the coordinator receives th ...

Write before This chapter is kubernetes series tutorials The second = article mainly introduces the deployment of the kubernetes cluster through the kubeadm installation tool. Considering the limitations of the domestic network, the mirror has been downloaded to the network disk for offline deployment. 1. Overview of the environment 1.1 Instal ...

Change from: https://www.jianshu.com/p/fc2d2dbd510b Principle introduction kerberos is mainly used for identity authentication in network communication, and its main feature is "complexity". So it's best to familiarize yourself with the principles of kerberos before entering the pit. Her ...

IO multiplexing The client program processes multiple socket s. (e.g. non blocking connect) The client program processes both user input and network connections. (e.g. chat program) The server should handle listening socket and connecting socket at the same time. The server processes both TCP and UDP ...

background Alibaba cloud functional computing is an event driven fully hosted computing service. Through function calculation, you don't need to manage infrastructure such as servers, just write code and upload it. Function calculation will prepare computing resources for you, run your code in a flexib ...

1, Show wait (conditional wait) common problem: The location is clearly right. Why can't the running code find the location. The location is clearly right. If the location is found, why is the text information empty? Analysis reason: frame not processed The page rendering speed is slower than the code of automatic test, and the page is locat ...

On October 31, at the 2019 China International Information and Communication Exhibition, the Ministry of industry and information technology announced that 5G business was officially launched. 5G business age is coming! The commercial application of 5G makes the data transmission speed, response speed, connection data, data transmission volu ...

Docker Security Difference between Docker and Virtual Machine Isolation and Sharing By adding Hypervisor layer, virtual hardware such as network card, memory, CPU and so on, virtual machines can be built on top of it. Each virtual machine has its own system core Docker containers isolate file systems, processes, devices, networks and other re ...

This article is [ From scratch, let's learn and develop a Flutter App together ]The second article on the road. This article will solve the problem left by the previous article: how does asynchronous processing work in Dart? First, we briefly introduce Future, sync and await, which are commonly used in Dart; second, we try to analyze the async ...

I'm a technical Xiaobai. The boss asked me to write a function of office online preview a few days ago. It's similar to Baidu online disk. I find all kinds of materials and summarize the methods I think are better to use.   There are probably several ways to preview office online.   The first kin ...