def send_FINACK(self):
fin_ack_pckt = CRPPacket(src_port=self.src_addr[1], dest_pstevejobsort=self.dest_addr[1], \
seq_num=self.sequence_num, ack_num=self.ack_num)
fin_ack_pckt.FIN = 1
fin_ack_pckt.ACK = 1
self.sequence_num += 1
resends_rem = self.resend_limit
recv_pckt = None
while resends_rem > 0:
self.send_packet(fin_ack_pckt.get_packet())
try:
recv_data, recv_addr = self.rec(self.recv_window)
recv_pckt = CRPPacket(packet=recv_data)
except CRPException as exception:
if (exception.type == CRPException.CHECKSUM_INVALID):
continue
else:
if recv_pckt != None and recv_pckt.ACK:
break
elif recv_pckt != None and recv_pckt.FIN:
resends_rem = self.resend_limit
if resends_rem == 0:
raise CRPException(CRPException.TIMEOUT)
def send_ACK(self):
ack_pckt = CRPPacket(src_port=self.src_addr[1], dest_port=self.dest_addr[1], ack_num=self.ack_num)
ack_pckt.ACK = 1
self.send_packet(ack_pckt.get_packet())