report on tcp server

7/25/2019 Report on Tcp Server

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ORGANIZATIONAL

PROFILE

INSTRUMENTS RESEARCH & DEVELOPMENT

ESTABLISHMENT (IRDE)

DEHRADUN

A

Part Of

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DEFENCE RESEARCH & DEVELOPMENT

ORGANIZATION (DRDO)

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1.1 ABOUT IRDE ABOUT IRDE

Brief Historical Backgro!"

The origin of IN#TRU$ENT# RE#EAR%H AND DE&ELOP$ENT

E#TABLI#H$ENT 'IRDE(dates back to the establishment of Inspectorate of

Scientific Stores in 1)*)at Ra+al,i!"i(Now in Pakistan) with the responsibility

to inspect Telecommunication equipment used by the Army This had the role of

At-orit for Hol"i!g #eal Particlars 'AH#P(.This AS!P underwent many

organi"ational changes until it took a shape of Tec-!ical De/elo,0e!t

Estalis-0e!t (Instruments and #lectronics) co$ering both R2D a!" AH#P

functions in fields of instruments during the subsequent years% shed some of its&' and A!SP responsibilities and came into eistence in its present form in

Ferar 1)34.

Instruments &esearch ' e$elopment #stablishment (I)% ehradun is a

pioneering institution de$oted to research% design% de$elopment and technology

transfer in the fields of sophisticated optical and electro*optical Instruments of $ital

interest to the efense Situated on the foothills of the great !imalayas% it houses

some of country+s best talents

Its primary role is to design% de$elop and pro$ide guideline for indigenous

manufacturing of modern and sophisticated equipment with the sole ob,ecti$e of

moderni"ing all three wings of efense Ser$ices

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1.5 AREA# OF 6OR7

&esearch% design and de$elopment in the fields of optical% electro*optical

and optronic instrumentation of sur$eillance% reconnaissance% piloting%

na$igation guidance% target identification and acquisition% weapon aiming%

designation% ranging and counter measures under all weather conditions

during day and night

esign and de$elopment of complete fire control systems and de$ices Applied and background research and de$elopment in applied optics

-reation and maintenance of facilities for parametric measurement

performance and en$ironment e$aluators of optical and electro optical

components.systems

Transfer of technology to public to pri$ate sectors% -onsultancy of optical

and electro*optical instruments% components and materials

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1.* PRE#ENT #%ENARIO

This establishment is at present de$oted towards the design and de$elopment of

equipment in the following areas

/ 0ptical instrument

1 Night $ision de$ices

2 3aser based instruments

4 Stabili"ation of systems

5 Thermal imaging system

6 Integrated fire control system

7 8iber optics

9 :icro controller% :icroprocessor and 8P;A based systems

I has also de$eloped a large number of 0pto*:edical instruments

Speciali"ed groups ha$e been created in the organi"ation that are de$oted

towards &esearch and e$elopment of instruments belonging to different areas

like 8iber optics% Imaging% &anging% 8ire control application and Tracking etc

Apart from the usual &' work% the organi"ation has also under taken the

in$estigation of ma,or defects eisting instruments% suggest solutions and carry out

ma,or modification if needed The establishment has also been assisting the Armed

8orces in the e$olution of foreign equipments

At the international le$el it maintains liaison with bodies like 0ptical Society of

America% International Society for 0ptical #ngineering% and Institute of #lectricaland #lectronics #ngineers (I###)

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1.8 BALLI#TI% %O$PUTER DI&I#ION


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%lie!t9#er/er

In -omputer science client*ser$er is a software architecture model

consisting of two parts% client systems and ser$er systems% both

communicating o$er a computer network or on the same computer A

client*ser$er application is a distributed system made up of both client

and ser$er software The client process always initiates a connection to

the ser$er% while the ser$er process always waits for requests from any

client =hen both the client process and ser$er process are running onthe same computer% this is called a single seat setup

Another type of related software architecture is known as peer*to*peer%

because each host or application instance can simultaneously act as both

a client and a ser$er (unlike centrali"ed ser$ers of the client*ser$er

model) and because each has equi$alent responsibilities and status Peer*

to*peer architectures are often abbre$iated using the acronym P1P

The client*ser$er relationship describes the relation between the client

and how it makes a ser$ice request to the ser$er% and how the ser$er can

accept these requests% process them% and return the requested information

to the client The interaction between client and ser$er is often described

using sequence diagrams Sequence diagrams are standardi"ed in the

>nified :odeling 3anguage


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The client*ser$er architecture has become one of the basic models of

network computing :any types of applications ha$e been written using

the client*ser$er model Standard networked functions such as #*mailechange% web access and database access% are based on the client*ser$er

model 8or eample% a web browser is a client program at the user

computer that may access information at any web ser$er in the world

A one ser$er based network

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A peer-to-peerbased network.

5.1 %lie!ts %-aracteristics Always initiates requests to ser$ers

=aits for replies

&ecei$es replies

>sually connects to a small number of ser$ers at one time

>sually interacts directly with end*users using any user interface

such as graphical user interface

5.5 #er/er %-aracteristics

Always wait for a request from one of the clients

Ser$e clients requests then replies with requested data to the

clients

A ser$er may communicate with other ser$ers in order to ser$e a

client request

A ser$er is a source which sends request to client to get

needed data of users

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%lie!t A!" #er/er %o00!icatio!

In general% a ser$ice is an abstraction of computer resources and a client

does not ha$e to be concerned with how the ser$er performs while

fulfilling the request and deli$ering the response The client only has to

understand the response based on the well*known application protocol%

ie the content and the formatting of the data for the requested ser$ice

-lients and ser$ers echange messages in a request@response messaging

pattern? The client sends a request% and the ser$er returns a response

This echange of messages is an eample of inter*process

communication To communicate% the computers must ha$e a common

language% and they must follow rules so that both the client and the

ser$er know what to epect The language and rules of communicationare defined in a communications protocol All client*ser$er protocols

operate in the application layer The application*layer protocol defines

the basic patterns of the dialogue To formali"e the data echange e$en

further% the ser$er may implement an API (such as a web ser$ice) The

API is an abstraction layer for such resources as databases and custom

software


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tasks at any moment% it relies on a scheduling system to prioriti"e

incoming requests from clients in order to accommodate them all in turn

To pre$ent abuse and maimi"e uptime% the ser$ers software limits how

a client can use the ser$ers resources #$en so% a ser$er is not immunefrom abuse A denial of ser$ice attack eploits a ser$ers obligation to

process requests by bombarding it with requests incessantly This

inhibits the ser$ers ability to respond to legitimate requests

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8.1 T%P #ER&ER

INTRODU%TION

The Transmission -ontrol Protocol (T-P) is a core protocol of the

Internet Protocol Suite It originated in the initial network

implementation in which it complemented the Internet Protocol (IP)

Therefore% the entire suite is commonly referred to as T-P.IP T-P

pro$ides reliable% ordered% and error*checked deli$ery of a stream of

octets between applications running on hosts communicating o$er an IP

network T-P is the protocol that ma,or Internet applications such as the

=orld =ide =eb% email% remote administration and file transfer rely on

Applications that do not require reliable data stream ser$ice may use the

>ser atagram Protocol (>P)% which pro$ides a connectionless

datagram ser$ice that emphasi"es reduced latency o$er reliability.

8.5 Net+ork F!ctio!

The Transmission -ontrol Protocol pro$ides a communication ser$ice at

an intermediate le$el between an application program and the Internet

Protocol It pro$ides host*to*host connecti$ity at the Transport 3ayer of

the Internet model An application does not need to know the particular

mechanisms for sending data $ia a link to another host% such as the

required packet fragmentation on the transmission medium At the

transport layer% the protocol handles all handshaking and transmission

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details and presents an abstraction of the network connection to the

application

At the lower le$els of the protocol stack% due to network congestion%

traffic load balancing% or other unpredictable network beha$ior% IP

packets may be lost% duplicated% or deli$ered out of order T-P detects

these problems% requests retransmission of lost data% rearranges out*of*

order data% and e$en helps minimi"e network congestion to reduce the

occurrence of the other problems If the data still remains undeli$ered%

its source is notified of this failure 0nce the T-P recei$er has

reassembled the sequence of octets originally transmitted% it passes them

to the recei$ing application Thus% T-P abstracts the applications

communication from the underlying networking details

T-P is utili"ed etensi$ely by many popular applications carried on the

Internet% including the =orld =ide =eb (===)% #*mail% 8ile Transfer

Protocol% Secure Shell% peer*to*peer file sharing% and many streamingmedia applications

T-P is optimi"ed for accurate deli$ery rather than timely deli$ery% and

therefore% T-P sometimes incurs relati$ely long delays (on the order of

seconds) while waiting for out*of*order messages or retransmissions of

lost messages It is not particularly suitable for real*time applicationssuch as Boice o$er IP 8or such applications% protocols like the &eal*time

Transport Protocol (&TP) running o$er the >ser atagram Protocol

(>P) are usually recommended instead

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T-P is a reliable stream deli$ery ser$ice that guarantees that all bytes

recei$ed will be identical with bytes sent and in the correct order Since

packet transfer o$er many networks is not reliable% a technique known as

positi$e acknowledgment with retransmission is used to guaranteereliability of packet transfers This fundamental technique requires the

recei$er to respond with an acknowledgment message as it recei$es the

data The sender keeps a record of each packet it sends The sender also

maintains a timer from when the packet was sent% and retransmits a

packet if the timer epires before the message has been acknowledged

The timer is needed in case a packet gets lost or corrupted

=hile IP handles actual deli$ery of the data% T-P keeps track of the

indi$idual units of data transmission% called segments% that a message is

di$ided into for efficient routing through the network 8or eample%

when an !T:3 file is sent from a web ser$er% the T-P software layer of

that ser$er di$ides the sequence of octets of the file into segments and

forwards them indi$idually to the IP software layer (Internet 3ayer) The

Internet 3ayer encapsulates each T-P segment into an IP packet by

adding a header that includes (among other data) the destination IP

address =hen the client program on the destination computer recei$es

them% the T-P layer (Transport 3ayer) reassembles the indi$idual

segments and ensures they are correctly ordered and error free as it

streams them to an application

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TCP communication

Basic Flo+c-art Of Tc, %o00!icatio!

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INTRODU%TION OF

PRO:E%T

;.1 AB#TRA%T

The Pro,ect C%lie!t #er/er %-at Usi!g


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;.5;.5 OB:E%TI&EOB:E%TI&E

The ob,ecti$e of this pro,ect named C%lie!t #er/er %-at Usi!g


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;.*


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rapid application de$elopment for mobile de$ices became possible%

although logic can be written with nati$e code as well to achie$e the best

possible performance Et can be used in se$eral other programming

languages $ia language bindings It runs on the ma,or desktop platformsand some of the mobile platforms It has etensi$e internationali"ation

support Non*;>I features include SE3 database access% :3 parsing%

HS0N parsing% thread management and network support

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#oft+are Arc-itectre

Et% when it was first released% relied on a few key concepts?

%o0,lete astractio! of t-e GUI@ =hen first released% Et used its

own paint engine and controls% emulating the look of the different

platforms it runs on when it drew its widgets This made the porting

work easier because $ery few classes in Et depended really on the target

platformF howe$er% this occasionally led to slight discrepancies where

that emulation was imperfect &ecent $ersions of Et use the nati$e style

APIs of the different platforms% on platforms that ha$e a nati$e widgetset% to query metrics and draw most controls% and do not suffer from

such issues as much0n some platforms (such as :ee;o and J#) Et is

the nati$e API Some other portable graphical toolkits ha$e made

different design decisionsF for eample% w=idgets uses the toolkits of

the target platform for its implementations

#ig!als a!" slots @ a language construct introduced in Et for

communication between ob,ects which makes it easy to implement the

0bser$er pattern while a$oiding boilerplate code The concept is that

;>I widgets can send signals containing e$ent information which can

be recei$ed by other controls using special functions known as slots

$etao>ect co0,iler@ The metaob,ect compiler% termed moc% is a tool

that is run on the sources of a Et program It interprets certain macros

from the -GG code as annotations% and uses them to generate added -GG

code with :eta Information about the classes used in the program This

:eta information is used by Et to pro$ide programming features nota$ailable nati$ely in -GG? signals and slots% introspection and

asynchronous function calls

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ReleasesI designing in Et -reator using embedded Et esigner

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8.8 HARD6ARE

2#OFT6ARERE


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8.; $ODULE DE#%RIPTION

Detaile" "escri,tio! of t-e 0o"les?

The ETcpSer$er class pro$ides a T-P*based ser$er

This class makes it possible to accept incoming T-P connections =e

can specify the port or ha$e ETcpSer$er pick one automatically =e can

listen on a specific address or on all the machines addresses

liste!'( ?to ha$e the ser$er listen for incoming connections

!e+%o!!ectio!'( ? the signal is then emitted each time a clientconnects to the ser$er

%all !e@tPe!"i!g%o!!ectio!'( ?to accept the pending connection as a

connected ETcpSocket The function returns a pointer to a ETcpSocket

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If an error occurs% ser/erError'(returns the type of error% and

error#tri!g'(can be called to get a human readable description of what

happened

=hen listening for connections% the address and port on which the ser$er

is listening are a$ailable as ser/erA""ress'(and ser/erPort'(.

%alli!g close'(makes ETcpSer$er stop listening for incoming

connections Although ETcpSer$er is mostly designed for use with an

e$ent loop% its possible to use it without one In that case% you must use

+aitForNe+%o!!ectio!'(?which blocks until either a connection is

a$ailable or a timeout epires.


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8.3 #%REEN #HOT#

First, we need to add network module to our project file,

MultiThreadedQTcpServer.pro:

QT += core

QT += network

QT -= gui

TARGET = MultiThreadedQTcpServer

CO!"G += con#ole

CO!"G -= app$%undle

TEM&'ATE = app

SO(RCES += )ain*cpp

Then, we want to create a new class called MyServer.

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Another class called :yThread should be created as well

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R! t-e co"e?

Then we get the result as in the picture below saying the ser$er is

listening?

Then% open up another cmd window% and send a connection request $ia

telnet?

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The picture below shows the two responses from two different clients

connection requests?

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8.3 FUTURE #%OPE

The software uses the Et console application%in future it can be mad using

the ;>I process

Since%chatting is most common these days in sharing pictures%files%$ideo

etcIn future this software can be used to transfer pictures%files%$ideo etc

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REFEREN%E#

M/Section 1/ https?..enwikipediaorg.wiki.tcpser$er

M/ Section 11%12%14https?..wwwsilabscom

M1Section 2/https?..enwikipediaorg

M1Section 21wwwtrimblecom.tcpOtutorials.whatgpsasp

M1Section 22wwwthecon$ersationcom.eplainer*what*is*tcp*/1149
https://en.wikipedia.org/wiki/tcphttps://www.silabs.com/http://www.trimble.com/tcp_tutorials/whatgps.aspxhttp://www.theconversation.com/explainer-what-is-tcp-12248https://www.silabs.com/http://www.trimble.com/tcp_tutorials/whatgps.aspxhttp://www.theconversation.com/explainer-what-is-tcp-12248https://en.wikipedia.org/wiki/tcp

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