def newFrame(buffer, next_frame_to_send, nBuffered, frame_expected, MAX_SEQ):
from_network_layer(buffer, next_frame_to_send, nBuffered)
# 帧属性
info = buffer[next_frame_to_send] # 待发送的信息
seq = next_frame_to_send # 序列号
ack = (frame_expected + MAX_SEQ) % (MAX_SEQ + 1) # ACK号
print("Cur Seq: ", seq)
print("Cur Ack: ", ack)
crc = CRC.generateCRC(info) # 生成校验和
data = crc.copy() # 整合后的数据
data.insert(0, ack)
data.insert(0, seq)
return data
cnt += 1
# 循环结束
if cnt == 21:
break
print("--------------------------------")
print("----------Frame Pair {}----------".format(cnt))
# 超时处理
TIMEOUT, next_frame_to_send = timeout(next_frame_to_send, ack_expected)
if TIMEOUT: # 重传
print("「ReSend」")
outputPara()
reSeq = next_frame_to_send
reACK = (frame_expected + MAX_SEQ) % (MAX_SEQ + 1)
reInfo = buffer[next_frame_to_send]
reCRC = CRC.generateCRC(reInfo)
data = reCRC.copy()
data.insert(0, reACK)
data.insert(0, reSeq)
reFrame = addHeadTail(data)
resend_data(reFrame, t, next_frame_to_send)
t[next_frame_to_send] = 0
next_frame_to_send = inc(next_frame_to_send)
# # 未启动双向filter
# counterLost += 1
# counterErr += 1
continue
# 丢弃一帧
if counterLost == filterLost:
print("「Send lost」")
