PYTHON

python sockets

'''
a library used to create end points. 
heres a quick exemple of a client and a local TCP server:'''

#server file
import socket

soc = socket.socket(socket.AF_INET) #initializing the socket

IP = "111.111.1.111" #the ip of the server. use 'ipconfig' on cmd to check your ip address (make sure its ipv4 because its a local server)
PORT = 5050 #the port of the server. can be any port as long its not in use 

soc.bind((IP,PORT)) #binding the ip and the port of the server
soc.listen() #letting the server accept clients
client, address = soc.accept() #waiting for a user to connect and store the user in the client variable and them address to the adress variable
client.send(b'hello client!') #sending a byte string to the client.



#client file (can be created from a different pc): 

soc = socket.socket(socket.AF_INET) #initializing the socket

IP = "111.111.1.111" #the ip of the server.  
PORT = 5050 #the port of the server.

soc.connect((IP,PORT)) #connecting to the server.

print(soc.recv(1024).decode()) #receiving the byte string from the server. passing as a parameter how much bytes we want to recieve. and we printing it on the string (the .decode() is used to decode the bytes)

socketserver python

"""
UDP echo server that converts a message
received from client into uppercase and
then sends it back to client. 
"""
from socket import *
# Port number of server
server_port = 12000
# Server using IPv4 and UDP socket
server_socket = socket(AF_INET, SOCK_DGRAM)
# Bind server to port number and IP address
server_socket.bind(("127.0.0.1", server_port))
print("The server is ready to receive msg...")
while True:
    # Extract message and client address from received msg
    message, client_address = server_socket.recvfrom(2048)
    # Create response message
    modified_message = message.upper()
    server_socket.sendto(modified_message, client_address)