scada protocols

//////////#import#import"Girl.h"#import"Boy.h"int main (int argc,Constchar * argv[]) {//////////use proxy//////////Girl *girl = [[Girl alloc] init]; Boy *boy = [[Boy alloc] init]; #warning?????????? 5. Designated Agent?????????? Girl.delegate = boy; [Girl Buybuybuy]; //output: Make money //determine if the object follows certain protocols BOOL result = [Girl Conformstoprotocol: @protocol ( marriage)]; if (Result) {nslog (@ " Follow the marriage agree

I have read more than just some introductory articles. At least I have downloaded the standard protocol document and read more than the overview part :) Some protocols have participated in the development of commercial products; Some are just some of the implementations of open source code; Some, just look at it and understand the design ideas of the Protocol. Instant messaging (IM) (Once circulated on the InternetJabber technical White PaperAndPro

script contains the detailed information of the data requested by your browser, rather than the operation process information. The Web (HTTP/html) protocol provides two recording methods: HTML-based and URL-based. These two methods allow you to specify the information to be recorded and the functions used by the script. For example, when you click the button (whether it is an image or a button) to submit information, vugen will generate the web_submit_data or web_submit_form function. Web_submi

the HTTP body on the submission of a Web service server (servlet,asp, etc.) processing is completed, The result is also written as XML as response back to the client, in order to make the client and the Web service can correspond to each other, you can use WSDL as a description of this mode of communication, using the WSDL tool can automatically generate WS and client framework files, SOAP has the ability to serialize complex objects into XML."Turn from" http://www.cnblogs.com/Ilin631/archive/2

scalability. Extended XMPP can address the needs of users by sending extended information, as well as applications such as content publishing systems and address-based services at the top of XMPP. Furthermore, XMPP contains software protocols for the server side to communicate with the other, making it easier for developers to build client applications or to add functionality to a system that is well equipped. Mqtt MQTT (Messages Queuing telemetry

This article describes the first example: five simple TCP Network service protocols, including Echo (RFC 862), Discard (RFC 863), Chargen (RFC 864), Daytime (RFC 867), Time (RFC 868), and time The client of the Protocol. The functions of each agreement are as follows: * Discard-discard all data received; * Daytime-service-side accept connection, send the current time as a string, and then actively disconnect; * Time-service-side accept connection,

The mail system is not a single system, but consists of different components and functions, and in order to realize the communication of mail, it requires some protocol support (i.e. mail protocol). The following is a brief description of the messaging system role and mail system protocols. Role of the messaging system MTA (Message transfer agent): Commonly referred to as mail Server Software, responsible for receiving messages sent by client softw

In practical applications routers are often connected to many different networks, to achieve communication between multiple networks, routing protocols are configured on routers, and in some large network topologies, there are situations where multiple routing protocols are common, and new technologies are used to---route redistribution. As a result of the company's business development needs, the acquisit

backbone network, people connected to it through the IPIP (IP Encapsulation IP) tunnel. The Unix program mrouted can understand the DVMRP and IGMP protocols, but the Internet Router cannot. Many customers who want to adopt Multicast technology are still asking their ISP why some protocols do not work. DVMRP refers to the distance vector multicast routing protocol. It uses IGMP subcode 13 and implements the

architecture 2. Switch application processing to Open Systems (Windows and Unix) 3. IP addresses are widely used as interconnection protocols None of these trends is surprising. Using the IP protocol, Intel-compatible open-system servers have dominated modern data centers. Given this dominant processing architecture, Ethernet Interconnection is a logical choice, and no other network protocols can occupy su

When Adobe, Microsoft, sun and other giants began to show their favor for "Open Source", the era of "open source" is approaching! Originally from: sinoprise.com/read.php? Tid-662-page-e-fpage-1.html (unfortunately this link has not been opened), I basically did not change, just some typographical and finishing.References: http://www.fsf.org/licensing/licenses/ There are many open-source protocols today, and there are currently 58 open-source

Link: http://www.awflasher.com/blog/archives/939 When Adobe, Microsoft, sun and other giants began to show their favor for "Open Source", the era of "open source" is approaching! Originally from: sinoprise.com/read.php? Tid-662-page-e-fpage-1.html (unfortunately this link has not been opened), I basically did not change, just some typographical and finishing.References: http://www.fsf.org/licensing/licenses/ There are many open-source protocols today

VPN protocols: PPTP, L2TP, and OpenVPN1. Concepts of PPTP, L2TP, and OpenVPN Tunneling Protocols 1. Default port number of PPTP (Point to Point Tunneling Protocol): 1723 PPTP, or PPTF Protocol. This protocol is a new enhanced security protocol developed on the basis of the PPP protocol. It supports multi-protocol Virtual Private Network (VPN) and can pass the password authentication protocol (PAP) and Exten

MPLS routing protocol is one of the most common protocols in the process of using a router. Many people may not understand the basic concepts of MPLS routing protocol. It doesn't matter. After reading this article, you will certainly have a lot of GAINS, I hope this article will teach you more things. MPLS routing protocol (Multiprotocol Label Switch) was initially proposed to speed up the forwarding of the router, but because MPLS is used in the Traf

When it comes to routing, users generally understand its role. However, as IT workers, IT is not enough to simply understand its role. We also need to understand the routing protocol and its classification. Now let's take a detailed summary of the classification of this routing protocol. First, let's take a look at its basic content. Classification of routing protocols Typical routing methods include Static Routing and dynamic routing. Static Routing