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sdo.client: Add missing abort messages #594

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Merged
merged 9 commits into from
Jul 13, 2025
Merged

sdo.client: Add missing abort messages #594

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fb5ea00
adding missing sdo aborts for sdo client
samsamfire Mar 15, 2023
551e20a
adding some missing sdo aborts (timeout, unknown command)
samsamfire Mar 15, 2023
14ecf12
Consistently format abort code literals.
acolomb Jun 17, 2025
080d873
Fix typo (grammatical error in exception message).
acolomb Jun 17, 2025
8beeba4
Avoid duplicate SDO abort messages on timeout.
acolomb Jun 18, 2025
cf34d24
Move SDO abort message sending to _block_ack() and _end_upload().
acolomb Jun 30, 2025
e020208
Ditch unused timeout_abort parameter again.
acolomb Jun 30, 2025
3de9bce
Another literal format.
acolomb Jun 30, 2025
d02f3a7
Add docstring to read_response() and detail exceptions.
acolomb Jul 13, 2025
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39 changes: 23 additions & 16 deletions canopen/sdo/client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -64,11 +64,13 @@
else:
break

def read_response(self):
def read_response(self, timeout_abort: bool = False):
try:
response = self.responses.get(
block=True, timeout=self.RESPONSE_TIMEOUT)
except queue.Empty:
if timeout_abort:
self.abort(0x0504_0000)

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Verified. But I'm not fond of using 0x0504_0000 directly in the code. They should rather be constants addressed by name. Add another PR for that?

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Sure, we can fix up the magic numbers in code in a follow-up. I'm usually very strict about that, but wanted to keep disruption low while we're looking at an actual bugfix.

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Since we're touching the code with this PR, I think I would suggest doing a quick and dirty fix to add them as literals. It can still be made as a minimal disruption change. E.g. we don't need to make literals of all SDO Errors, just the few we touch here.

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Let's focus on the logic first. I will follow up with the literals change once this is merged. The bigger question is whether we want to get rid of the extra parameter again, as mentioned in #594 (comment)?

raise SdoCommunicationError("No SDO response received")
res_command, = struct.unpack_from("B", response)
if res_command == RESPONSE_ABORTED:
Expand All @@ -85,11 +87,11 @@
self.send_request(sdo_request)
# Wait for node to respond
try:
return self.read_response()
return self.read_response(timeout_abort=False)
except SdoCommunicationError as e:
retries_left -= 1
if not retries_left:
self.abort(0x5040000)
self.abort(0x0504_0000)

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raise
logger.warning(str(e))

Expand Down Expand Up @@ -302,8 +304,10 @@
response = self.sdo_client.request_response(request)
res_command, = struct.unpack_from("B", response)
if res_command & 0xE0 != RESPONSE_SEGMENT_UPLOAD:
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError(f"Unexpected response 0x{res_command:02X}")
if res_command & TOGGLE_BIT != self._toggle:
self.sdo_client.abort(0x0503_0000)

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raise SdoCommunicationError("Toggle bit mismatch")
length = 7 - ((res_command >> 1) & 0x7)
if res_command & NO_MORE_DATA:
Expand Down Expand Up @@ -362,6 +366,7 @@
response = sdo_client.request_response(request)
res_command, = struct.unpack_from("B", response)
if res_command != RESPONSE_DOWNLOAD:
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError(
f"Unexpected response 0x{res_command:02X}")
else:
Expand Down Expand Up @@ -390,6 +395,7 @@
response = self.sdo_client.request_response(request)
res_command, = struct.unpack_from("B", response)
if res_command & 0xE0 != RESPONSE_DOWNLOAD:
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError(
f"Unexpected response 0x{res_command:02X}")
bytes_sent = len(b)
Expand All @@ -414,6 +420,7 @@
response = self.sdo_client.request_response(request)
res_command, = struct.unpack("B", response[0:1])
if res_command & 0xE0 != RESPONSE_SEGMENT_DOWNLOAD:
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError(
f"Unexpected response 0x{res_command:02X} "
f"(expected 0x{RESPONSE_SEGMENT_DOWNLOAD:02X})")
Expand Down Expand Up @@ -487,7 +494,7 @@
res_command, res_index, res_subindex = SDO_STRUCT.unpack_from(response)
if res_command & 0xE0 != RESPONSE_BLOCK_UPLOAD:
self._error = True
self.sdo_client.abort(0x05040001)
self.sdo_client.abort(0x0504_0001)
raise SdoCommunicationError(f"Unexpected response 0x{res_command:02X}")
# Check that the message is for us
if res_index != index or res_subindex != subindex:
Expand Down Expand Up @@ -520,7 +527,7 @@
return self.readall()

try:
response = self.sdo_client.read_response()
response = self.sdo_client.read_response(timeout_abort=False)
except SdoCommunicationError:
response = self._retransmit()
res_command, = struct.unpack_from("B", response)
Expand All @@ -544,7 +551,7 @@
if self._done:
if self._server_crc != self._crc.final():
self._error = True
self.sdo_client.abort(0x05040004)
self.sdo_client.abort(0x0504_0004)

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raise SdoCommunicationError("CRC is not OK")
logger.info("CRC is OK")
self.pos += len(data)
Expand All @@ -556,16 +563,16 @@
end_time = time.time() + self.sdo_client.RESPONSE_TIMEOUT
self._ack_block()
while time.time() < end_time:
response = self.sdo_client.read_response()
response = self.sdo_client.read_response(timeout_abort=False)
res_command, = struct.unpack_from("B", response)
seqno = res_command & 0x7F
if seqno == self._ackseq + 1:
# We should be back in sync
self._ackseq = seqno
return response
self._error = True
self.sdo_client.abort(0x05040000)
raise SdoCommunicationError("Some data were lost and could not be retransmitted")
self.sdo_client.abort(0x0504_0000)
raise SdoCommunicationError("Some data was lost and could not be retransmitted")

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def _ack_block(self):
request = bytearray(8)
Expand All @@ -576,15 +583,15 @@
self._ackseq = 0

def _end_upload(self):
response = self.sdo_client.read_response()
response = self.sdo_client.read_response(timeout_abort=True)
res_command, self._server_crc = struct.unpack_from("<BH", response)
if res_command & 0xE0 != RESPONSE_BLOCK_UPLOAD:
self._error = True
self.sdo_client.abort(0x05040001)
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError(f"Unexpected response 0x{res_command:02X}")
if res_command & 0x3 != END_BLOCK_TRANSFER:
self._error = True
self.sdo_client.abort(0x05040001)
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError("Server did not end transfer as expected")
# Return number of bytes not used in last message
return (res_command >> 2) & 0x7
Expand Down Expand Up @@ -654,7 +661,7 @@
response = sdo_client.request_response(request)
res_command, res_index, res_subindex = SDO_STRUCT.unpack_from(response)
if res_command & 0xE0 != RESPONSE_BLOCK_DOWNLOAD:
self.sdo_client.abort(0x05040001)
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError(
f"Unexpected response 0x{res_command:02X}")
# Check that the message is for us
Expand Down Expand Up @@ -734,14 +741,14 @@

def _block_ack(self):
logger.debug("Waiting for acknowledgement of last block...")
response = self.sdo_client.read_response()
response = self.sdo_client.read_response(timeout_abort=True)
res_command, ackseq, blksize = struct.unpack_from("BBB", response)
if res_command & 0xE0 != RESPONSE_BLOCK_DOWNLOAD:
self.sdo_client.abort(0x05040001)
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError(
f"Unexpected response 0x{res_command:02X}")
if res_command & 0x3 != BLOCK_TRANSFER_RESPONSE:
self.sdo_client.abort(0x05040001)
self.sdo_client.abort(0x0504_0001)

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raise SdoCommunicationError("Server did not respond with a "
"block download response")
if ackseq != self._blksize:
Expand Down
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