def testFrameTransmitterTransmitsAckFrameCorrectly(self):
tmp = MockSink()
sink = EscapingSink(tmp)
transmitter = FrameTransmitter(sink)
transmitter.transmit(FrameTransmitter.ACK() + 0x24)
for i in range(0, 5):
transmitter.schedule()
sink.schedule()
crc = crc_ccitt_update(0xFFFF, FrameTransmitter.ACK() + 0x24)
self.assertEqual([EscapingSink.FLAG(), FrameTransmitter.ACK() + 0x24, crc >> 8, crc & 0xFF, EscapingSink.FLAG()], tmp.items)
def go(self):
if self.outer.transmitter.isReady():
while self.zeroFrame != self.lastAckReceived:
del (self.outgoingFrameBuffer[0])
self.zeroFrame += 1
if self.sendSyn:
self.outer.transmitter.transmit(
FrameTransmitter.SYN_COMPLETE())
self.idleCount = 0
self.sendSyn = False
elif self.sendAck:
self.outer.transmitter.transmit(
FrameTransmitter.ACK() +
self.expectedSequenceNumber.value)
self.idleCount = 0
self.sendAck = False
elif len(self.outgoingFrameBuffer) > 0:
if self.sendUserFrame:
self.outer.transmitter.transmit(
self.zeroFrame.value, self.outgoingFrameBuffer[0])
self.idleCount = 0
self.sendUserFrame = False
else:
self.idleCount += 1
if self.idleCount > self.timeout:
self.sendUserFrame = True
def testFrameTransmitterBecomesReadyOnlyOnceTransmissionComplete(self):
tmp = MockSink()
sink = EscapingSink(tmp)
transmitter = FrameTransmitter(sink)
transmitter.transmit(FrameTransmitter.ACK() + 0x24)
for i in range(0, 5):
self.assertFalse(transmitter.isReady())
transmitter.schedule()
sink.schedule()
self.assertTrue(transmitter.isReady())
def testFrameTransmitterBecomesUnreadyWhenTransmitting(self):
tmp = MockSink()
sink = EscapingSink(tmp)
transmitter = FrameTransmitter(sink)
transmitter.transmit(FrameTransmitter.ACK() + 0x24)
self.assertFalse(transmitter.isReady())