Programming Assignment 1 Simple client-server application

Programming Assignment 1

Objective of this assignment:
• To get you familiar with developing and implementing TCP or UDP sockets.
What you need to do:
1. Implement a simple TCP Client-Server application
2. Implement a simple UDP Client-Server application
3. Collect and analyze round trip time measurements for each client.
Objective:
The objective is to implement a simple client-server application using a safe method: start from a simple working
code for the client and the server. You must slowly and carefully bend (modify) little by little the client and server
alternatively until you achieve your ultimate goal. You must bend and expand each piece alternatively like the way a blacksmith forges iron. From time to time save your working client and server such that you can roll-back to the latest working
code in case of problems. If you do not use this "baby steps" strategy, you may end up with a ball of wax not working hard
to debug.
For this programming assignment, you are advised to start from the simple echo client and server to implement a
very simple application.
Part I: TCP "Capitalize" Client-Server
Implement the following Client-Server application that will use two programs: a client program
myFirstTCPClient.java and myFirstTCPServer.java
a) Client: myFirstTCPClient.java
This program must take two arguments: a hostname H and a port number P. The hostname h is a name or a
decimal dotted-quad IP address of the server Sv. The port number P is any valid port number where the server Sv is binds
to. On Tux machines, a valid UDP or TCP port number is in the range 10010-10200
This client program must:
1) Create a TCP client socket connected with the server Sv running on the machine with hostname (or IP address)
h bound to Port number P.
2) Repeatedly perform the following actions:
i) Prompt the user to enter a sentence S
ii) Send the sentence S to the server Sv
iii) Receive the response from the server
iv) Measure the duration between the time when the sentence S was sent and the time a response was
received.
v) Display the following information: the message received and the time expressed in milliseconds.
vi) Collect the round trip time.
To implement the client myFirstTCPClient.java, you should consider starting with the program TCPEchoClient.java
(provided on Canvas with this programming assignment). Do not forget to change the name of the class inside the program
TCPEchoClient.java to match your program name.
b) Server: myFirstTCPServer.java
This server program must take one argument: a port number P. The port number P is any valid port number.
This server program must:
1) Create a TCP server socket
2) Wait for a client to connect, receive a message, display it with the IP address and port # of the client, capitalize
the message, display the message, and echo back the "capitalized" message.
To implement the server myFirstTCPServer.java, you should consider starting with the program
TCPEchoServer.java (provided on Canvas with this programming assignment). Do not forget to change the name of the
class inside the program TCPEchoServer.java.
Programming Assignment 1

Part II: UDP "Capitalize" Client-Server
Repeat Part I using UDP sockets. Call the client and server programs myFirstUDPClient.java and
myFirstUDPServer.java, respectively.
To implement the server (respectively, client) myFirstUDPServer.java (respectively, myFirstUDPClient.java), you
should consider starting with the program UDPEchoServer.java (respectively, UDPEchoClienTimeout.java) (provided on
Canvas with this programming assignment). Do not forget to change the name of the class inside the program.
Data collection and analysis
For each client (UPD and TCP), report separately the min, average, and max round trip time. Include screenshots
of your TCP and UDP client and server executing on the Tux machines. Screenshots on machines other than the Tux
machines will not receive any credit.
Programming Assignment 1

Report
• Write a report that will report your results. The report should not exceed 2 pages.
• Your report must contain the following information:
o whether the programs work or not (this must be just ONE sentence)
o the directions to compile and execute your program
o the information this assignment asks you to report (minimum, average, and maximum round trip times)
o required screenshots od the execution of TCP and UDP clients and servers.
What you need to turn in:
• Electronic copy of your source programs (standalone)
• Electronic copy of the report (including your answers) (standalone). Submit the file as a Microsoft Word or PDF file.
Grading
1) TCP client is worth 20% if it works well: communicates with YOUR server. Furthermore, screenshots of your client and
server running on Tux machines must be provided. The absence of screenshots or Screenshots on machines other than the Tux
machines will incur a 7.5% penalty.
2) TCP client is worth 5% if it works well with a working server from any of your classmates.
All other server and clients (TCP server, UDP client, and UDP server) will be graded the same as the TCP client
(20% + 5%).