# Set up socket
s = socket.socket()
s.connect((host, port))
l = int(s.recv(8).decode('utf_8'))
print(l)
print(type(l))
print('Got length {}'.format(l))
text = []
while l:
received = s.recv(8).decode('utf_8')
if received == '':
break
received = int(received)
print('Received {}'.format(received))
decoded_frame = decoder.decode([received], verbose=True)
if decoded_frame != None:
text.append(decoded_frame)
l -= 1
s.close()
print('\t\t')
# print(text)
text = ''.join(text)
print(text)
with open('output.txt', 'w') as f:
f.write(text)
crc = CRC()
# data_pkt = namedtuple('data_pkt', 'seq_num frame')
# ack_pkt = namedtuple('ack_pkt', 'seq_num ack')
# Communication
s = socket(AF_INET, SOCK_DGRAM)
s.bind((hostname, port))
print("Listening for client requests ... ")
exp_seq_no = 0
while 1:
msg, client_address = s.recvfrom(65535)
data = pickle.loads(msg)
got_seq_no, frame = data['seq_num'], data['frame']
print('Packet Recv seq_no {} '.format(got_seq_no))
if random() < probability: # Random packet drop simulation
decoded = crc.decode([frame], verbose=True)
if decoded is not None: # Checksum is correct
if got_seq_no == exp_seq_no: # Send ack
to_send = rdt_send(got_seq_no)
if to_send:
s.sendto(to_send, client_address)
f_write(decoded, output_file)
exp_seq_no = exp_seq_no + 1
elif got_seq_no > exp_seq_no: # Future packet received, hence dropped
print("Packet loss, sequence number = " + str(got_seq_no))
elif got_seq_no < exp_seq_no: # Repeat sent
to_send = rdt_send(exp_seq_no)
if to_send:
# print ("Retransmitted ACK - " + str(got_seq_no))
s.sendto(to_send, client_address)
else: