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This includes both OSI and TCP/IP models theory, internals of HTTP protocol, and Python networking libraries (socket, httplib, urllib, requests etc).

For this task you need to create a simple Skype-like REST chat web service and a client for this.
A server application need not keep state in some storage, it is enough to keep it in memory for simplicity.

A REST protocol should allow to:
-          Register a new named client (user);
-          Create, enter, delete a chat room;
-          Post, update, delete messages into a specific chat room;
-          Get messages for a chat room (all or only updates since the last known state);




Please, develop a simple *nix client-server application in Python that imitates sending short news messages from multiple contributors to a single server. The application has the following requirements.
 
Server must:
·         Listen on multiple ports simultaneously (configurable) to process messages from multiple clients at the same time;
·         Support multiple message transmission protocols (TCP and UDP for now, but easily extendable for other protocols; UDP may be implemented as stubs that don’t do anything);
·         Write down each incoming message to a log (together with all significant info about this message) and send delivery confirmation back to the client.
 
Client must:
·         Have a possibility for user to enter:
o   Server IP/port;
o   The message to be sent;
o   Protocol to use to send each message (TCP or UDP; UDP may be implemented as stubs that don’t do anything);
·         Output the information about all sent messages and their delivery status;
·         If a server is not reachable at the moment of sending a client should retry sending the message.
 
A nice-to-have feature is a command-line user interface.