server.py

from socket import *
from bitarray import *
from datalink import *
from physical import *

#Utility function to convert the standard Bitarray datatypes to the String
def bitarray_to_string(x):
    s=""
    for i in x:
        if i==False:
            s+="0"
        else:
            s+="1"  
        
    return s


HOST = "127.0.0.1" #Self host as mandatory for establishing the connection
PORT = 1947  # Port as mandatory for establishing the connection, on which the server is listening
hostname = gethostbyname('0.0.0.0')

global temp
while True:
    with socket(AF_INET, SOCK_STREAM) as s: #initializing the socket with s and with basic properties
        s.bind((hostname, int(PORT))) #binding the socket to the given port and host
        s.listen() #Socket starts listening to the requests.
        print("The Server is listening now!")
        conn, addr = s.accept()
        with conn: #Connection Established and data can be recieved.
            print('Connected by', addr)
            print("\n")
            while True:
                data = conn.recv(1024) #Recieve the data from the connected client and save its address.
                temp = data.decode('utf-8')
                if not data:
                    break
                
                i=0
                #Utility function that print the packets that are recieved.
                print("Packets recieved are:::::")
                num_packets = (int(len(temp)/16)-1)*16
                flag = '01111110'
                while i <= num_packets:
                    temp_string = temp[i:i+16]
                    print(flag+str(temp_string)+flag)
                    i = i + 16
                print("=============================================================================")
                print("Data recieved from socket is(After Cumulating) ::\n ",temp)
                physical_decoded_output = manchester_decoding(bitarray(temp))

                print("=============================================================================")
                print("Data after manchester decoding is ::\n ",physical_decoded_output)
                #Testing Code
                #print("LEngth of message before header removing is\n",len(physical_decoded_output))
                print("=============================================================================")
                removed_header_output=remove_header(bitarray_to_string(physical_decoded_output))
                #Testing Code
                # print("Data after removing header is ::\n ",removed_header_output)
                #Testing Code
                #print("LEngth of message after removing header is\n",len(removed_header_output))
                datalink_decoded_output = crcdecode(removed_header_output)
   
    temp = None