TELE 3118: Network Technologies: Mini-project >10 points@
Note 1: This assignment can be done in pairs i.e. groups of two people but if so you are required to inform the lab demonstrators
about the pairing by email no later than the end of week 7. Partners for the mini-project need not be from the same lab session. The
working code is to be demonstrated in lab during week 10.
Note 2: This assignment can be done in any programming language however we strongly recomend that it be done in Python for
two reasons: a Python is very easy to learn and is increasingly being used for simple network programs and b Python provides
many support libraries for network functions such as Flask web-server and JSON encoding routines. You are encouraged to use
resources including sample code from the web that can help you with your project.
This lab introduces you to writing network applications by exposing you to the socket API for UDP comunication and REST-based
APIs for TCP communication. The application you develop will require you to maintain in-memory a small database of student
marks. The first part of the project requires you to populate this database by querying a server using a UDP socket while the second
part of the project requires you to run a web-server so that a web-browser can query your database over a TCP connection.
Part 1 >5 points@:Populating your database: In this part you will write a UDP client program that sends a message to a UDP server
requesting the list of students and their marks. Please use the sample UDP server code - you can run it locally on your machine for
testing purposes and once you have your client working with your local server you can connect to the real UDP server running on
149.171.37.122. Your message to the UDP server should have the following content:
The command string "studentmarklist" should fit in exactly in 16 bytes including a null terminator
Your registration message should contain nothing more and nothing less than the string above and should be compatible with the
following C structure "ReqMsg_t":
typedef struct { char passwd[16]; } ReqMsg_t; /* request message */
In response the UDP server will send you back a message containing a list of students and their marks in the format below:
The first 4-bytes unsigned integer in network order will indicate how many students are on the list.
The rest of the mesage will be an array of at most 50 items of a structure that includes the following information for each
student: 16-byte user-name character string including a null terminator followed by a 4-byte mark unsigned integer in
network order.
The message you receive will be compatible with the following C structure "RespMsg_t":
typedef struct { char studentName[16]; unsigned long studentMark; } StudentRec_s; /* info about each student */
typedef struct { unsigned long nStudents; /* number of users (no more than 50) */ StudentRec_t studentRec[50]; /* record
for each student */ } RespMsg_t; /* response message */
Part 2 >5 points@: Querying the database using a web-browser: In this part you will develop a web-server that allows the database to
be queried using any web-browser. Your web-server will support the following HTTP GET operations:
"/api/studentlist" should return the list of students as an array encoded in JSON.
"/api/studentmark/>student-name@" should return the mark for the student whose name is specified as part of the URL string.
The outputs of the queries above should be viewable using any browser. it is recommended that you use the Python Flask
framework for developing your web-server and Python's JSON encoder library for sending JSON formatted strings.
Bonus >up to 3 points@: Bonus points will be given to students who develop and demonstrate a web front-end for displaying the
results of the queries nstead of just text output on the web-browser. It is recommended that the Bootstrap JavaScript front-end
framework be used though other front-end frameworks e.g. AngularJS are also acceptable.
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