def test_sent_rej_lost(self):
"""
L2CAP/ERM/BI-01-C [S-Frame [REJ] Lost or Corrupted]
Verify the IUT can handle receipt of an S-=frame [RR] Poll = 1 if the S-frame [REJ] sent from the IUT
is lost.
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm(tx_window_size=5)
ertm_tx_window_size = 5
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x41,
use_ertm=True)
cert_channel.send_i_frame(tx_seq=0, req_seq=0, payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.SFrame(req_seq=1))
cert_channel.send_i_frame(tx_seq=ertm_tx_window_size - 1,
req_seq=0,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(
L2capMatchers.SFrame(s=SupervisoryFunction.REJECT))
cert_channel.send_s_frame(req_seq=0, p=Poll.POLL)
assertThat(cert_channel).emits(
L2capMatchers.SFrame(req_seq=1,
f=l2cap_packets.Final.POLL_RESPONSE))
for i in range(1, ertm_tx_window_size):
cert_channel.send_i_frame(tx_seq=i,
req_seq=0,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.SFrame(req_seq=i + 1))
def test_receive_i_frames(self):
"""
L2CAP/ERM/BV-02-C [Receive I-Frames]
Verify the IUT can receive in-sequence valid I-frames and deliver L2CAP SDUs to the Upper Tester
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
for i in range(3):
cert_channel.send_i_frame(tx_seq=i,
req_seq=0,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.SFrame(req_seq=i + 1))
cert_channel.send_i_frame(tx_seq=3,
req_seq=0,
sar=SegmentationAndReassembly.START,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.SFrame(req_seq=4))
cert_channel.send_i_frame(tx_seq=4,
req_seq=0,
sar=SegmentationAndReassembly.CONTINUATION,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.SFrame(req_seq=5))
cert_channel.send_i_frame(tx_seq=5,
req_seq=0,
sar=SegmentationAndReassembly.END,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.SFrame(req_seq=6))
def test_handle_rej_and_i_frame_with_f_set(self):
"""
L2CAP/ERM/BI-05-C [Handle receipt of S-Frame [REJ] and I-Frame [F=1] that Both Require Retransmission of the Same I-Frames]
Verify the IUT will only retransmit the requested I-frames once after receiving an S-frame [REJ]
followed by an I-frame with the Final bit set that indicates the same I-frames should be retransmitted.
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
dut_channel.send(b'abc')
dut_channel.send(b'abc')
assertThat(cert_channel).emits(
L2capMatchers.IFrame(tx_seq=0), L2capMatchers.IFrame(tx_seq=1),
L2capMatchers.SFrame(p=l2cap_packets.Poll.POLL)).inOrder()
# Send SREJ with F not set
cert_channel.send_s_frame(req_seq=0,
s=SupervisoryFunction.SELECT_REJECT)
assertThat(cert_channel).emitsNone(timeout=timedelta(seconds=0.5))
cert_channel.send_i_frame(tx_seq=0,
req_seq=0,
f=Final.POLL_RESPONSE,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.IFrame(tx_seq=0))
assertThat(cert_channel).emits(L2capMatchers.IFrame(tx_seq=1))
def test_handle_duplicate_srej(self):
"""
L2CAP/ERM/BI-03-C [Handle Duplicate S-Frame [SREJ]]
Verify the IUT will only retransmit the requested I-frame once after receiving a duplicate SREJ.
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
dut_channel.send(b'abc')
dut_channel.send(b'abc')
assertThat(cert_channel).emits(
L2capMatchers.IFrame(tx_seq=0), L2capMatchers.IFrame(tx_seq=1),
L2capMatchers.SFrame(p=Poll.POLL)).inOrder()
cert_channel.send_s_frame(req_seq=0,
s=SupervisoryFunction.SELECT_REJECT)
assertThat(cert_channel).emitsNone(timeout=timedelta(seconds=0.5))
cert_channel.send_s_frame(req_seq=0,
s=SupervisoryFunction.SELECT_REJECT,
f=Final.POLL_RESPONSE)
assertThat(cert_channel).emits(L2capMatchers.IFrame(tx_seq=0))
def test_receive_i_frame_final_bit_set(self):
"""
L2CAP/ERM/BV-19-C [Receive I-Frame Final Bit = 1]
Verify the IUT will retransmit any previously sent I-frames unacknowledged by receipt of an I-frame
with the final bit set.
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
dut_channel.send(b'abc')
# TODO: Always use their retransmission timeout value
time.sleep(2)
assertThat(cert_channel).emits(L2capMatchers.SFrame(p=Poll.POLL))
cert_channel.send_i_frame(tx_seq=0,
req_seq=0,
f=Final.POLL_RESPONSE,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.IFrame(tx_seq=0))
def test_receive_packet_from_unknown_channel(self):
self._setup_link_from_cert()
(dut_channel, cert_channel) = self._open_channel(scid=0x41, psm=0x33)
i_frame = l2cap_packets.EnhancedInformationFrameBuilder(
0x99, 0, Final.NOT_SET, 1,
l2cap_packets.SegmentationAndReassembly.UNSEGMENTED, SAMPLE_PACKET)
self.cert_l2cap.send_acl(i_frame)
assertThat(cert_channel).emitsNone(L2capMatchers.SFrame(req_seq=4),
timeout=timedelta(seconds=1))
def test_acknowledging_received_i_frames(self):
"""
L2CAP/ERM/BV-03-C [Acknowledging Received I-Frames]
Verify the IUT sends S-frame [RR] with the Poll bit not set to acknowledge data received from the
Lower Tester
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
for i in range(3):
cert_channel.send_i_frame(tx_seq=i,
req_seq=0,
payload=SAMPLE_PACKET)
assertThat(cert_channel).emits(L2capMatchers.SFrame(req_seq=i + 1))
assertThat(cert_channel).emitsNone(L2capMatchers.SFrame(req_seq=4),
timeout=timedelta(seconds=1))
def test_transmit_s_frame_rr_with_final_bit_set(self):
"""
L2CAP/ERM/BV-09-C [Send S-Frame [RR] with Final Bit Set]
Verify the IUT responds with an S-frame [RR] with the Final bit set after receiving an S-frame [RR]
with the Poll bit set.
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
cert_channel.send_s_frame(req_seq=0, p=Poll.POLL)
assertThat(cert_channel).emits(
L2capMatchers.SFrame(f=Final.POLL_RESPONSE))
def test_transmit_s_frame_rr_with_poll_bit_set(self):
"""
L2CAP/ERM/BV-08-C [Send S-Frame [RR] with Poll Bit Set]
Verify the IUT sends an S-frame [RR] with the Poll bit set when its retransmission timer expires.
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
dut_channel.send(b'abc')
# TODO: Always use their retransmission timeout value
time.sleep(2)
assertThat(cert_channel).emits(
L2capMatchers.SFrame(p=l2cap_packets.Poll.POLL))
def test_recieve_rnr(self):
"""
L2CAP/ERM/BV-20-C [Enter Remote Busy Condition]
Verify the IUT will not retransmit any I-frames when it receives a remote busy indication from the
Lower Tester (S-frame [RNR]).
"""
self._setup_link_from_cert()
self.cert_l2cap.turn_on_ertm()
(dut_channel, cert_channel) = self._open_channel(scid=0x41,
psm=0x33,
use_ertm=True)
dut_channel.send(b'abc')
# TODO: Always use their retransmission timeout value
time.sleep(2)
assertThat(cert_channel).emits(
L2capMatchers.SFrame(p=l2cap_packets.Poll.POLL))
cert_channel.send_s_frame(req_seq=0,
s=SupervisoryFunction.RECEIVER_NOT_READY,
f=Final.POLL_RESPONSE)
assertThat(cert_channel).emitsNone(L2capMatchers.IFrame(tx_seq=0))