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Fixed : retransmission of discarded segments starts at beginning of new block #546

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Fixed : retransmission of discarded segments starts at beginning of new block #546

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1a74fb6
Fixed : retransmission of discarded segments starts at beginning of n…
samsamfire Nov 6, 2024
33aa620
Test : add a block retransmit test. This test passes with this implem…
samsamfire Jan 15, 2025
7fe2c71
Comment : fixed wrong value in comment
samsamfire Jan 15, 2025
ab4d150
Comment : better comments on the different steps of the block
samsamfire Jan 15, 2025
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2 changes: 1 addition & 1 deletion canopen/sdo/client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -561,7 +561,7 @@ def _retransmit(self):
response = self.sdo_client.read_response()
res_command, = struct.unpack_from("B", response)
seqno = res_command & 0x7F
if seqno == self._ackseq + 1:
if seqno == 1:
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I'm wondering why the self._ack_block() call doesn't simply reset the self._ackseq attribute to zero in all cases. Then this check would be fine as is?

Just thinking out loud, let's hear your thoughts on why this is the better place to fix it.

# We should be back in sync
self._ackseq = seqno
return response
Expand Down
308 changes: 308 additions & 0 deletions test/test_sdo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -170,6 +170,314 @@ def test_block_upload(self):
data = fp.read()
self.assertEqual(data, 'Tiny Node - Mega Domains !')

def test_sdo_block_upload_retransmit(self):
"""Send 'the crazy fox jumps over the lazy dog\n' multiple times
and trigger a retransmit by only validating a block partially.
"""
self.data = [
(TX, b"\xa4\x08\x10\x00\x7f\x00\x00\x00"),
(RX, b"\xc4\x08\x10\x00\x00\x00\x00\x00"),
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(RX, b"\x32\x68\x65\x20\x63\x72\x61\x7a"),
(RX, b"\x34\x79\x20\x66\x6f\x78\x20\x6a"),
(RX, b"\x34\x75\x6d\x70\x73\x20\x6f\x76"), # --> Wrong seqno (x34 instead of x33)
Comment on lines +231 to +232
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Are these lines intentionally using the same sequence number? From the comment I'd assume the previous segment should have been missing, not misunderstood.

(RX, b"\x35\x65\x72\x20\x74\x68\x65\x20"), # All the following frames until end of block
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(RX, b"\x37\x67\x0a\x74\x68\x65\x20\x63"), # resent by server.
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(RX, b"\x58\x20\x66\x6f\x78\x20\x6a\x75"),
(RX, b"\x59\x6d\x70\x73\x20\x6f\x76\x65"),
(RX, b"\x5a\x72\x20\x74\x68\x65\x20\x6c"),
(RX, b"\x5b\x61\x7a\x79\x20\x64\x6f\x67"),
(RX, b"\x5c\x0a\x74\x68\x65\x20\x63\x72"),
(RX, b"\x5d\x61\x7a\x79\x20\x66\x6f\x78"),
(RX, b"\x5e\x20\x6a\x75\x6d\x70\x73\x20"),
(RX, b"\x5f\x6f\x76\x65\x72\x20\x74\x68"),
(RX, b"\x60\x65\x20\x6c\x61\x7a\x79\x20"),
(RX, b"\x61\x64\x6f\x67\x0a\x74\x68\x65"),
(RX, b"\x62\x20\x63\x72\x61\x7a\x79\x20"),
(RX, b"\x63\x66\x6f\x78\x20\x6a\x75\x6d"),
(RX, b"\x64\x70\x73\x20\x6f\x76\x65\x72"),
(RX, b"\x65\x20\x74\x68\x65\x20\x6c\x61"),
(RX, b"\x66\x7a\x79\x20\x64\x6f\x67\x0a"),
(RX, b"\x67\x74\x68\x65\x20\x63\x72\x61"),
(RX, b"\x68\x7a\x79\x20\x66\x6f\x78\x20"),
(RX, b"\x69\x6a\x75\x6d\x70\x73\x20\x6f"),
(RX, b"\x6a\x76\x65\x72\x20\x74\x68\x65"),
(RX, b"\x6b\x20\x6c\x61\x7a\x79\x20\x64"),
(RX, b"\x6c\x6f\x67\x0a\x74\x68\x65\x20"),
(RX, b"\x6d\x63\x72\x61\x7a\x79\x20\x66"),
(RX, b"\x6e\x6f\x78\x20\x6a\x75\x6d\x70"),
(RX, b"\x6f\x73\x20\x6f\x76\x65\x72\x20"),
(RX, b"\x70\x74\x68\x65\x20\x6c\x61\x7a"),
(RX, b"\x71\x79\x20\x64\x6f\x67\x0a\x74"),
(RX, b"\x72\x68\x65\x20\x63\x72\x61\x7a"),
(RX, b"\x73\x79\x20\x66\x6f\x78\x20\x6a"),
(RX, b"\x74\x75\x6d\x70\x73\x20\x6f\x76"),
(RX, b"\x75\x65\x72\x20\x74\x68\x65\x20"),
(RX, b"\x76\x6c\x61\x7a\x79\x20\x64\x6f"),
(RX, b"\x77\x67\x0a\x74\x68\x65\x20\x63"),
(RX, b"\x78\x72\x61\x7a\x79\x20\x66\x6f"),
(RX, b"\x79\x78\x20\x6a\x75\x6d\x70\x73"),
(RX, b"\x7a\x20\x6f\x76\x65\x72\x20\x74"),
(RX, b"\x7b\x68\x65\x20\x6c\x61\x7a\x79"),
(RX, b"\x7c\x20\x64\x6f\x67\x0a\x74\x68"),
(RX, b"\x7d\x65\x20\x63\x72\x61\x7a\x79"),
(RX, b"\x7e\x20\x66\x6f\x78\x20\x6a\x75"),
(RX, b"\x7f\x6d\x70\x73\x20\x6f\x76\x65"),
(TX, b"\xa2\x7f\x7f\x00\x00\x00\x00\x00"), # --> This block is acknlowedged without issues
(RX, b"\x01\x72\x20\x74\x68\x65\x20\x6c"),
(RX, b"\x02\x61\x7a\x79\x20\x64\x6f\x67"),
(RX, b"\x03\x0a\x74\x68\x65\x20\x63\x72"),
(RX, b"\x04\x61\x7a\x79\x20\x66\x6f\x78"),
(RX, b"\x05\x20\x6a\x75\x6d\x70\x73\x20"),
(RX, b"\x06\x6f\x76\x65\x72\x20\x74\x68"),
(RX, b"\x07\x65\x20\x6c\x61\x7a\x79\x20"),
(RX, b"\x08\x64\x6f\x67\x0a\x74\x68\x65"),
(RX, b"\x09\x20\x63\x72\x61\x7a\x79\x20"),
(RX, b"\x0a\x66\x6f\x78\x20\x6a\x75\x6d"),
(RX, b"\x0b\x70\x73\x20\x6f\x76\x65\x72"),
(RX, b"\x0c\x20\x74\x68\x65\x20\x6c\x61"),
(RX, b"\x0d\x7a\x79\x20\x64\x6f\x67\x0a"),
(RX, b"\x0e\x74\x68\x65\x20\x63\x72\x61"),
(RX, b"\x0f\x7a\x79\x20\x66\x6f\x78\x20"),
(RX, b"\x10\x6a\x75\x6d\x70\x73\x20\x6f"),
(RX, b"\x11\x76\x65\x72\x20\x74\x68\x65"),
(RX, b"\x12\x20\x6c\x61\x7a\x79\x20\x64"),
(RX, b"\x13\x6f\x67\x0a\x74\x68\x65\x20"),
(RX, b"\x14\x63\x72\x61\x7a\x79\x20\x66"),
(RX, b"\x15\x6f\x78\x20\x6a\x75\x6d\x70"),
(RX, b"\x16\x73\x20\x6f\x76\x65\x72\x20"),
(RX, b"\x17\x74\x68\x65\x20\x6c\x61\x7a"),
(RX, b"\x18\x79\x20\x64\x6f\x67\x0a\x74"),
(RX, b"\x19\x68\x65\x20\x63\x72\x61\x7a"),
(RX, b"\x1a\x79\x20\x66\x6f\x78\x20\x6a"),
(RX, b"\x1b\x75\x6d\x70\x73\x20\x6f\x76"),
(RX, b"\x1c\x65\x72\x20\x74\x68\x65\x20"),
(RX, b"\x1d\x6c\x61\x7a\x79\x20\x64\x6f"),
(RX, b"\x1e\x67\x0a\x74\x68\x65\x20\x63"),
(RX, b"\x1f\x72\x61\x7a\x79\x20\x66\x6f"),
(RX, b"\x20\x78\x20\x6a\x75\x6d\x70\x73"),
(RX, b"\x21\x20\x6f\x76\x65\x72\x20\x74"),
(RX, b"\x22\x68\x65\x20\x6c\x61\x7a\x79"),
(RX, b"\xa3\x20\x64\x6f\x67\x0a\x00\x00"),
(TX, b"\xa2\x23\x7f\x00\x00\x00\x00\x00"),
(RX, b"\xc9\x3b\x49\x00\x00\x00\x00\x00"),
(TX, b"\xa1\x00\x00\x00\x00\x00\x00\x00"), # --> Transfer ends without issues
]
data = []
with self.network[2].sdo[0x1008].open("r", block_transfer=True) as fp:
data = fp.read()
assert data == 39 * "the crazy fox jumps over the lazy dog\n"

def test_writable_file(self):
self.data = [
(TX, b'\x20\x00\x20\x00\x00\x00\x00\x00'),
Expand Down
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