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Before I begin, I'd like to describe what this so-called communication program is all about. The communication program is similar to a weak version of QQ, login needs to register, after successful login, you can achieve instant communication, group chat, private chat, but also can be transmitted documents. Let's get to the last picture Server side: Client Login:
Redis Communication Protocol (protocol) This document is translated from: Http://redis.io/topics/protocol. The Redis protocol compromises between the following three goals: ease of implementation can be efficiently analyzed by computer (parse) can easily be read by humans to
4. Roundtrip-based communication protocol design The core of the Communication Server plug-in is three parts: (1) Implementation of communication protocols unrelated to communication methods and business logic; (2) Implementation of co
Author: vamei Source: http://www.cnblogs.com/vamei welcome reprint, please also keep this statement. Thank you! The signal transmission must always meet certain requirements.Protocol). For example, the Great Wall is filled with Wolf smoke because the physical signal of the wolf smoke has been preset to represent the abstract signal of "enemy intrusion. Such a"Langyan = enemy intrusion"Is a simple protocol. The
Today, let's talk about the standard Internet communication protocol-TCP/IP protocol.This part of content may not be very understandable and abstract. It is a tough nut for beginners, but since it is a beginner, don't let everyone have any mental burden. No one is a genius, right? I will try my best to give you more examples for your understanding!1. Basic ContentTCP/IPTransmission Control
connection after each request ends, the HTTP connection is a "short connection", which requires constant connection requests to the server to maintain the client program's online status. As a general practice, there is no need to obtain any data immediately, and the client will keep a "keep-connected" request to the server at regular intervals, and the server responds to the client after receiving the request, indicating that the client is "online". If the server can not receive the client's re
request.Because HTTP is actively releasing the connection after each request ends, the HTTP connection is a "short connection", which requires constant connection requests to the server to maintain the client program's online status. As a general practice, there is no need to obtain any data immediately, and the client will keep a "keep-connected" request to the server at regular intervals, and the server responds to the client after receiving the request, indicating that the client is "online"
address byte 3: Register address byte 4: Data length byte 5: Data length byte 6:CRC check byte 7:CRC checksum 4, the function code commonly used 0x01 reads the status of the output relay 0x02 read the status of the input relay 0X03 Read multiple registers 0x05 write the status of a single output relay 0x0F write the status of multiple output relays 0X10 Write multiple registers 5, Example: Modbus-rtu reading temperature and hu
The SIP Protocol provides a standard-based IP communication method for multiple devices and applications. This White Paper describes the support for the SIP protocol in the Cisco communications system. Cisco's Unified Communication System includes IP voice, data and video communica
Added the AXI4 specification (the specification for in-SOC IP interconnect developed by ARM and XILINX), with the addition of the Advanced System Bus (ASB) and advanced Peripheral Bus (APB) to the latest version of AMBA4.0, from the very beginning of the AMBA1.0 version definition to the AHB APB, the Advanced tracking bus ATB, et. The AHP APB Axi can be considered as the bus protocol or specification within the scope CPU, however we often refer to the
Tags: how to profile mode routing different structure query technology useModbus Communication protocol:Introduction: Modbus protocol is a common language used in electronic controllerThrough this protocol, the controller is connected to each other via a network (e.g. Ethernet)and other devices can communicate, he has become a general industry standard, has itcon
Serial communication refers to the serial port bitwise (BIT) Send and receive bytes. Although it is slower than parallel traffic by byte (byte), the serial port can receive data with another line while sending data using one line. Serial Communication Protocol (serial communication
Communication knowledge of the network processBare sockets, segments, shards, MTUProcess address, user space, kernel spaceInter-process communication, socketTCP protocolHTTP protocolHypertext definition, Hyper-text formatWeb resources:DynamicStaticAccess to the portal, the resources being accessedCross-site references/hotlinkingUri,url,run relationship, subsetURL formatHost address + process address (port)B
Protocol buffers: An extensible way to serialize structured data, language neutrality, platform neutrality, and data protocols for communication protocols, data storage, and much more, think of Xml,json, but smaller, simpler and faster than XML. Protocol buffers is a flexible and efficient automated mechanism for serializing structured data. All you need to do is
The difference between the UDP protocol and the TCP protocol is no longer analyzed, mainly to analyze how these two protocols are used in Java communication programming.First introduces TCP, which provides good support for the Tcp,java language. To establish TCP communication, you need to build the server first andTo t
): currently ipv4,0100 Header Length (4bits): Used to indicate the length of the header. 0-15, this refers to the unit is a 32-bit word (that is, 4 bytes), so the maximum length is 15*4=60byte = 480bits. Service type (8bits): 1-3bit is the priority sub-segment, which is now ignored; 4-7bit: represents latency, throughput, reliability, and cost, respectively. A value of 1 indicates the minimum delay, maximum throughput, maximum reliability, and minimum cost, respectively. The four can onl
Flash is the most popular rich client performance software on existing web pages. Therefore, it is necessary for components to support Flash Object Protocol Communication. because the components can be compatible with different protocols through the extension protocol analyzer, you can use fluorinefx to implement TCP Communic
Recently, a project to use the codec chip to do voice acquisition and output, the driver is used stm32f405 I2S interface. Prior to not in-depth knowledge of i2s, but probably know that it is a bus for the transmission of audio data. Originally thought there is no difficult, actually use down actually also did not feel has anything special. But still in the process of use to put yourself in a hole.Codec chip model is MAX9867, the main applications are mobile phones and hearing aids and the like.
First, IntroductionThe data interchange format between the GPS (Global Positioning System) receiver and the handset is usually customized by the manufacturer, and its definition content is difficult for ordinary users to know, and the control applications configured by different brands and different models of GPS receivers are different depending on the manufacturer. Therefore, for general purpose GPS application software, a uniform format data standard is needed to solve the interface problem w
Label:Environment Description: Today, the Linux system installed on the virtual machine, and loaded with DB2, but in the connection encountered a problem, baffled. Here are the specific questions and solutions Problem Description: Workaround: 1. Ping the server first to ping. If the server ping fails, then is the network problem, need to modify the corresponding connection and IP, this does not describe 2. Check that the server firewall is close enough Note: We need to shut down two types of fi
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