Socket programming in python - User Datagram Protocol

Socket Programming UDP

Socket Programming for client-server communication using User-Datagram-Protocol in Python.

UDP client:
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# Include the socket library for networking
import socket
import sys

# Set server IP address and server socket port number
ServerName = 'localhost' # Could be IP address or host name of sever(website)
ServerPort = 1234 # integer

# Create client socket
ClientSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # IPv4, UDP socket
# not specifying client port number, this job is left for the OS to do it for us.

# Creating message
message = raw_input('Enter lower case sentence: ')

# Send the message
ClientSocket.sendto(message,(ServerName,ServerPort)) # server address also attached, but not manually, but automatically by the code.

#Wait for receiving reply from Server
modified_message, ServerAddress = ClientSocket.recvfrom(2048) # reply stored in modified_message 
# & message source address (not required) anyways stored in ServerAddress

# Print message
print modified_message
print ServerAddress
# Close client socket
ClientSocket.close()


UDP server:
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#  UDP server
# include libraries
import socket
import sys

# Create server
ServerName = 'localhost'
ServerPort = 1234

# Create server socket
ServerAddress = (ServerName, ServerPort)
ServerSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # IPv4, UDP socket

# Associate server port number with the socket
ServerSocket.bind(ServerAddress)  # anything sent to this port number will be received by this server
                  
print 'The server is ready to receive'

# For continuous receival of messages

while 1:
                  message, ClientAddress = ServerSocket.recvfrom(2048) # receive the message from client along with source address
                  print ClientAddress
                  print ServerPort 
                  modifiedmessage = message.upper() # Capitalize the message
                  ServerSocket.sendto(modifiedmessage,ClientAddress) # Attaches client address to the message and sends
                  # Waits for other messages.

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