obd2 protocol

) because ICMP error messages sometimes require special processing, they need to be differentiated. For example, in response to an ICMP error message, there will never be another ICMP error message (if there is no such restriction rule, there may be a situation where the error results in another error, and the error will result in an endless loop).(4) when sending an ICMP error message, the message always contains the header of the IP and the first 8 bytes of the IP datagram that generated the I

--------------------------------------------------------------------------------------------------------------- ------------To configure Tomcat:Navigate to the Tomcat installation directory and locate the Server.xml file under ConfFind the following code that has been commented:XML code Connector port="8443" protocol="http/1.1" sslenabled="true" maxthreads= "Scheme=" " https" secure="true" clientauth="false" sslprotocol="TLS" />

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 the server's IP and port number.Socket class under the TCP protocol:The Java.net.Socket cla

headers in front (as the Protocol says).Request messageThis defines the HTTP Request message in RFC2616:Request = Request-Line *(( general-header | request-header（跟本次请求相关的一些header） | entity-header ) CRLF)（跟本次请求相关的一些header） CRLF [ message-body ] 用图来表示如下：The request message for an HTTP starts with a line of requests, starting with the header on the second line, followed by a blank line, indicating the

Commands and responses to the SMTP protocol From the previous communication model, you can see that the SMTP protocol's session between sending SMTP and receiving SMTP is done by sending SMTP commands and receiving an answer to SMTP feedback. After the communication link is established, Send SMTP send mail command message sender, if receive SMTP at this time can receive mail then make OK answer, and then send SMTP continue to Issue RCPT command to co

The Wgscd-picked Rtp/rtcp (real-time transport protocol/real-time Transport Control Protocol) is based on UDP-derived protocols and adds control over real-time transmission. Commonly used for online transmission of real-time video data, such as remote video surveillance, video-on-demand. There is a book called "Multimedia Network Transmission Protocol" on the s

RIP and IGRP are commonly used router configuration protocols. What problems should we pay attention to when configuring RIP and IGRP? What should we do? The following configuration steps provide detailed answers. RIP Protocol RIP (Routing information Protocol) is an Internal Gateway Protocol (IGP) that is widely used earlier and is suitable for small-sized sim

The TCP protocol is a unique identifier (IP address, protocol, port) that interacts with other processes using the network communication fee.TCP and UDP are the most different place, TCP provides a reliable data transmission service, TCP is connection-oriented, that is, the use of TCP communication between the two host first to go through a "call" process, wait until the end of the communication is ready to

Network programming, and obtain protocol data by protocol name-Linux general technology-Linux technology and application information. The following is a detailed description. # Include # Include Int main () { Struct protent * pro; Pro = getprotobyname ("tcp "); Printf ("protocol name: % s \ n", pro-> p_name ); Printf ("

SSCOP Service specific Connection oriented Protocol business-specific connection-oriented protocolThe function of SSCOP is to provide service to its upper SSCF module, to establish and release signaling connection for upper layer signaling user, and to provide a confirmed and non-verifiable message data transmission on the connection to reliably exchange signaling messages.It utilizes the non-reliable transmission process provided by the SAAL-CP layer

ICMP Internet Control Message Protocolis generally considered an integral part of the IP layer and is generally used by the IP layer or higher (TCP, UDP).The ICMP message is transmitted inside the IP datagram.The format of the ICMP message is as follows:The first 4 bytes of the message are the same: 8bit type, 8bit code, 16bit test and.The ICMP packets have different message types, and the different types are determined by the 8bit type and the 8bit code together. There may be more than one code

(unencrypted) as strings in base64 format.Network eavesdroppers can easily read data. Use Basic verification only for security purposes. For example, if you do not need to protect your creden, or bind an HTTP network encryption protocol (such as SSL ),. 3.2 digest Verification You also need to provide account information in the Login Dialog Box displayed in the browser. But the difference is that,Hash string used to verify the password passed b

@protocol MyProtocol @required//Declares what must be done, by default@required-(void) walk;-(void) speak;-(void) think; Think is not implemented in the class implementation warns!!!@optional-(void) sing;-(void) laugh;@endA protocol can declare a large stack of methods, but cannot declare member variables;Two agreements can not inherit, but the agreement may abide by another agreement;Subclasses can abide

This is an http-based resumable data transfer protocol, mainly using different httpmethods and related custom headers to implement the resumable data transfer function.Specific methods and headers:1. HEADThe head request is used to obtain the status of the uploaded file. The server returns the range of the files that have been written and those that have not been written.(PS, I just found that the Protocol

AJP13 is a directional packet protocol. For performance reasons, use binary format to transfer readability text. The Web server is connected through a TCP connection and a servlet container. To reduce the cost of the process to generate a socket, the Web server and the servlet container try to maintain a persistent TCP connection and reuse a connection for multiple request/reply loops. Once the connection is assigned to a specific request, it is not a

Preface:During the four-time TCP wave , who voluntarily disconnects, who has time_wait, passive disconnects one side will have close_wait Time_wait: Keep the end share population with 2mls~4min, avoid the other side still have some TCP chip sends to this port, the new chain accepts the influence. Disadvantages of Time_wait: taking up memory Close_wait: The passive closing party receives the fin signal immediately after the reply ACK means to receive the fin signal, while entering th

Chapter 3: IOS Table view delegation protocol and Data Protocol, iostable Table view has two important protocols UITableViewDataSource: Data Source Protocol Method Return type Description Required tableView:cellForRowAtIndexPath: UITableViewCell* Provides data for table View cells. This method is required. Yes tab

HTTPThe development (World Wide Web Consortium) AndInternetTeam (Internet Engineering Task Force) Cooperation results, (they) finally released a seriesRFC, The most famous of which isRFC 2616.RFC 2616DefinedHTTPA common version of the protocol --HTTP 1.1. HTTPIs a protocol used for requests and responses between the client and the server. OneHTTPClient, such asWebBrowser, by creating a special port to the

Labels: routers, routers, priority Switches Experiment 1. Hot Backup routing protocol (HSRP) Lab Objectives Create a virtual gateway and configure the priority of HSRP to implement hot backup of routes, practical application and migration of the virtual gateway. Lab Environment Three routers, one vswitch and three PCs PC 0 IP 192.168.1.1 192.168.1.254 PC 1 IP 192.168.1.2 192.168.1.254 PC 2 IP 192.168.4.1 192.168.4.252 650) This. width = 650; "Title ="

Layer-7 network protocol functions layer functions in the TCP/IP family OSI TCP/IP protocol family www.2cto.com Application Layer file transmission, email, file service, virtual terminal TFTP, HTTP, SNMP, FTP, SMTP, DNS, RIP, Telnet presentation layer data formatting, code conversion, data encryption no protocol Session Layer is removed or connections with other