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samsamfire
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acolomb
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Fix check for retransmission of discarded block segments (#546)
We are waiting for the sequence number to be the same as the last good known sequence number, to start considering the messages. However, this is wrong because the SDO server will start sending the discarded segments at the start of a new block, which means the sequence number restarts from 1. Reset the internal _ackseq counter to zero after each acknowledgement, which results in the correct value being compared after retransmission. Add a block retransmit test. This test passes with this implementation but will fail with an invalid CRC without fix for discarded segments. Co-authored-by: André Colomb <src@andre.colomb.de>
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2 files changed

+306
-2
lines changed

2 files changed

+306
-2
lines changed

‎canopen/sdo/client.py‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -575,8 +575,7 @@ def _ack_block(self):
575575
request[1] = self._ackseq
576576
request[2] = self.blksize
577577
self.sdo_client.send_request(request)
578-
if self._ackseq == self.blksize:
579-
self._ackseq = 0
578+
self._ackseq = 0
580579

581580
def _end_upload(self):
582581
response = self.sdo_client.read_response()

‎test/test_sdo.py‎

Lines changed: 305 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -187,6 +187,311 @@ def test_block_upload(self):
187187
data = fp.read()
188188
self.assertEqual(data, 'Tiny Node - Mega Domains !')
189189

190+
def test_sdo_block_upload_retransmit(self):
191+
"""Trigger a retransmit by only validating a block partially."""
192+
self.data = [
193+
(TX, b'\xa4\x08\x10\x00\x7f\x00\x00\x00'),
194+
(RX, b'\xc4\x08\x10\x00\x00\x00\x00\x00'),
195+
(TX, b'\xa3\x00\x00\x00\x00\x00\x00\x00'),
196+
(RX, b'\x01\x74\x68\x65\x20\x63\x72\x61'),
197+
(RX, b'\x02\x7a\x79\x20\x66\x6f\x78\x20'),
198+
(RX, b'\x03\x6a\x75\x6d\x70\x73\x20\x6f'),
199+
(RX, b'\x04\x76\x65\x72\x20\x74\x68\x65'),
200+
(RX, b'\x05\x20\x6c\x61\x7a\x79\x20\x64'),
201+
(RX, b'\x06\x6f\x67\x0a\x74\x68\x65\x20'),
202+
(RX, b'\x07\x63\x72\x61\x7a\x79\x20\x66'),
203+
(RX, b'\x08\x6f\x78\x20\x6a\x75\x6d\x70'),
204+
(RX, b'\x09\x73\x20\x6f\x76\x65\x72\x20'),
205+
(RX, b'\x0a\x74\x68\x65\x20\x6c\x61\x7a'),
206+
(RX, b'\x0b\x79\x20\x64\x6f\x67\x0a\x74'),
207+
(RX, b'\x0c\x68\x65\x20\x63\x72\x61\x7a'),
208+
(RX, b'\x0d\x79\x20\x66\x6f\x78\x20\x6a'),
209+
(RX, b'\x0e\x75\x6d\x70\x73\x20\x6f\x76'),
210+
(RX, b'\x0f\x65\x72\x20\x74\x68\x65\x20'),
211+
(RX, b'\x10\x6c\x61\x7a\x79\x20\x64\x6f'),
212+
(RX, b'\x11\x67\x0a\x74\x68\x65\x20\x63'),
213+
(RX, b'\x12\x72\x61\x7a\x79\x20\x66\x6f'),
214+
(RX, b'\x13\x78\x20\x6a\x75\x6d\x70\x73'),
215+
(RX, b'\x14\x20\x6f\x76\x65\x72\x20\x74'),
216+
(RX, b'\x15\x68\x65\x20\x6c\x61\x7a\x79'),
217+
(RX, b'\x16\x20\x64\x6f\x67\x0a\x74\x68'),
218+
(RX, b'\x17\x65\x20\x63\x72\x61\x7a\x79'),
219+
(RX, b'\x18\x20\x66\x6f\x78\x20\x6a\x75'),
220+
(RX, b'\x19\x6d\x70\x73\x20\x6f\x76\x65'),
221+
(RX, b'\x1a\x72\x20\x74\x68\x65\x20\x6c'),
222+
(RX, b'\x1b\x61\x7a\x79\x20\x64\x6f\x67'),
223+
(RX, b'\x1c\x0a\x74\x68\x65\x20\x63\x72'),
224+
(RX, b'\x1d\x61\x7a\x79\x20\x66\x6f\x78'),
225+
(RX, b'\x1e\x20\x6a\x75\x6d\x70\x73\x20'),
226+
(RX, b'\x1f\x6f\x76\x65\x72\x20\x74\x68'),
227+
(RX, b'\x20\x65\x20\x6c\x61\x7a\x79\x20'),
228+
(RX, b'\x21\x64\x6f\x67\x0a\x74\x68\x65'),
229+
(RX, b'\x22\x20\x63\x72\x61\x7a\x79\x20'),
230+
(RX, b'\x23\x66\x6f\x78\x20\x6a\x75\x6d'),
231+
(RX, b'\x24\x70\x73\x20\x6f\x76\x65\x72'),
232+
(RX, b'\x25\x20\x74\x68\x65\x20\x6c\x61'),
233+
(RX, b'\x26\x7a\x79\x20\x64\x6f\x67\x0a'),
234+
(RX, b'\x27\x74\x68\x65\x20\x63\x72\x61'),
235+
(RX, b'\x28\x7a\x79\x20\x66\x6f\x78\x20'),
236+
(RX, b'\x29\x6a\x75\x6d\x70\x73\x20\x6f'),
237+
(RX, b'\x2a\x76\x65\x72\x20\x74\x68\x65'),
238+
(RX, b'\x2b\x20\x6c\x61\x7a\x79\x20\x64'),
239+
(RX, b'\x2c\x6f\x67\x0a\x74\x68\x65\x20'),
240+
(RX, b'\x2d\x63\x72\x61\x7a\x79\x20\x66'),
241+
(RX, b'\x2e\x6f\x78\x20\x6a\x75\x6d\x70'),
242+
(RX, b'\x2f\x73\x20\x6f\x76\x65\x72\x20'),
243+
(RX, b'\x30\x74\x68\x65\x20\x6c\x61\x7a'),
244+
(RX, b'\x31\x79\x20\x64\x6f\x67\x0a\x74'),
245+
(RX, b'\x32\x68\x65\x20\x63\x72\x61\x7a'),
246+
(RX, b'\x34\x79\x20\x66\x6f\x78\x20\x6a'), # --> Wrong seqno (x34 instead of x33)
247+
(RX, b'\x33\x75\x6d\x70\x73\x20\x6f\x76'), # All the following frames until end of block
248+
(RX, b'\x35\x65\x72\x20\x74\x68\x65\x20'), # will be ignored by the client and should be
249+
(RX, b'\x36\x6c\x61\x7a\x79\x20\x64\x6f'), # resent by server.
250+
(RX, b'\x37\x67\x0a\x74\x68\x65\x20\x63'),
251+
(RX, b'\x38\x72\x61\x7a\x79\x20\x66\x6f'),
252+
(RX, b'\x39\x78\x20\x6a\x75\x6d\x70\x73'),
253+
(RX, b'\x3a\x20\x6f\x76\x65\x72\x20\x74'),
254+
(RX, b'\x3b\x68\x65\x20\x6c\x61\x7a\x79'),
255+
(RX, b'\x3c\x20\x64\x6f\x67\x0a\x74\x68'),
256+
(RX, b'\x3d\x65\x20\x63\x72\x61\x7a\x79'),
257+
(RX, b'\x3e\x20\x66\x6f\x78\x20\x6a\x75'),
258+
(RX, b'\x3f\x6d\x70\x73\x20\x6f\x76\x65'),
259+
(RX, b'\x40\x72\x20\x74\x68\x65\x20\x6c'),
260+
(RX, b'\x41\x61\x7a\x79\x20\x64\x6f\x67'),
261+
(RX, b'\x42\x0a\x74\x68\x65\x20\x63\x72'),
262+
(RX, b'\x43\x61\x7a\x79\x20\x66\x6f\x78'),
263+
(RX, b'\x44\x20\x6a\x75\x6d\x70\x73\x20'),
264+
(RX, b'\x45\x6f\x76\x65\x72\x20\x74\x68'),
265+
(RX, b'\x46\x65\x20\x6c\x61\x7a\x79\x20'),
266+
(RX, b'\x47\x64\x6f\x67\x0a\x74\x68\x65'),
267+
(RX, b'\x48\x20\x63\x72\x61\x7a\x79\x20'),
268+
(RX, b'\x49\x66\x6f\x78\x20\x6a\x75\x6d'),
269+
(RX, b'\x4a\x70\x73\x20\x6f\x76\x65\x72'),
270+
(RX, b'\x4b\x20\x74\x68\x65\x20\x6c\x61'),
271+
(RX, b'\x4c\x7a\x79\x20\x64\x6f\x67\x0a'),
272+
(RX, b'\x4d\x74\x68\x65\x20\x63\x72\x61'),
273+
(RX, b'\x4e\x7a\x79\x20\x66\x6f\x78\x20'),
274+
(RX, b'\x4f\x6a\x75\x6d\x70\x73\x20\x6f'),
275+
(RX, b'\x50\x76\x65\x72\x20\x74\x68\x65'),
276+
(RX, b'\x51\x20\x6c\x61\x7a\x79\x20\x64'),
277+
(RX, b'\x52\x6f\x67\x0a\x74\x68\x65\x20'),
278+
(RX, b'\x53\x63\x72\x61\x7a\x79\x20\x66'),
279+
(RX, b'\x54\x6f\x78\x20\x6a\x75\x6d\x70'),
280+
(RX, b'\x55\x73\x20\x6f\x76\x65\x72\x20'),
281+
(RX, b'\x56\x74\x68\x65\x20\x6c\x61\x7a'),
282+
(RX, b'\x57\x79\x20\x64\x6f\x67\x0a\x74'),
283+
(RX, b'\x58\x68\x65\x20\x63\x72\x61\x7a'),
284+
(RX, b'\x59\x79\x20\x66\x6f\x78\x20\x6a'),
285+
(RX, b'\x5a\x75\x6d\x70\x73\x20\x6f\x76'),
286+
(RX, b'\x5b\x65\x72\x20\x74\x68\x65\x20'),
287+
(RX, b'\x5c\x6c\x61\x7a\x79\x20\x64\x6f'),
288+
(RX, b'\x5d\x67\x0a\x74\x68\x65\x20\x63'),
289+
(RX, b'\x5e\x72\x61\x7a\x79\x20\x66\x6f'),
290+
(RX, b'\x5f\x78\x20\x6a\x75\x6d\x70\x73'),
291+
(RX, b'\x60\x20\x6f\x76\x65\x72\x20\x74'),
292+
(RX, b'\x61\x68\x65\x20\x6c\x61\x7a\x79'),
293+
(RX, b'\x62\x20\x64\x6f\x67\x0a\x74\x68'),
294+
(RX, b'\x63\x65\x20\x63\x72\x61\x7a\x79'),
295+
(RX, b'\x64\x20\x66\x6f\x78\x20\x6a\x75'),
296+
(RX, b'\x65\x6d\x70\x73\x20\x6f\x76\x65'),
297+
(RX, b'\x66\x72\x20\x74\x68\x65\x20\x6c'),
298+
(RX, b'\x67\x61\x7a\x79\x20\x64\x6f\x67'),
299+
(RX, b'\x68\x0a\x74\x68\x65\x20\x63\x72'),
300+
(RX, b'\x69\x61\x7a\x79\x20\x66\x6f\x78'),
301+
(RX, b'\x6a\x20\x6a\x75\x6d\x70\x73\x20'),
302+
(RX, b'\x6b\x6f\x76\x65\x72\x20\x74\x68'),
303+
(RX, b'\x6c\x65\x20\x6c\x61\x7a\x79\x20'),
304+
(RX, b'\x6d\x64\x6f\x67\x0a\x74\x68\x65'),
305+
(RX, b'\x6e\x20\x63\x72\x61\x7a\x79\x20'),
306+
(RX, b'\x6f\x66\x6f\x78\x20\x6a\x75\x6d'),
307+
(RX, b'\x70\x70\x73\x20\x6f\x76\x65\x72'),
308+
(RX, b'\x71\x20\x74\x68\x65\x20\x6c\x61'),
309+
(RX, b'\x72\x7a\x79\x20\x64\x6f\x67\x0a'),
310+
(RX, b'\x73\x74\x68\x65\x20\x63\x72\x61'),
311+
(RX, b'\x74\x7a\x79\x20\x66\x6f\x78\x20'),
312+
(RX, b'\x75\x6a\x75\x6d\x70\x73\x20\x6f'),
313+
(RX, b'\x76\x76\x65\x72\x20\x74\x68\x65'),
314+
(RX, b'\x77\x20\x6c\x61\x7a\x79\x20\x64'),
315+
(RX, b'\x78\x6f\x67\x0a\x74\x68\x65\x20'),
316+
(RX, b'\x79\x63\x72\x61\x7a\x79\x20\x66'),
317+
(RX, b'\x7a\x6f\x78\x20\x6a\x75\x6d\x70'),
318+
(RX, b'\x7b\x73\x20\x6f\x76\x65\x72\x20'),
319+
(RX, b'\x7c\x74\x68\x65\x20\x6c\x61\x7a'),
320+
(RX, b'\x7d\x79\x20\x64\x6f\x67\x0a\x74'),
321+
(RX, b'\x7e\x68\x65\x20\x63\x72\x61\x7a'),
322+
(RX, b'\x7f\x79\x20\x66\x6f\x78\x20\x6a'), # --> Last element of block
323+
(TX, b'\xa2\x32\x7f\x00\x00\x00\x00\x00'), # --> Last good seqno (x32)
324+
(RX, b'\x01\x79\x20\x66\x6f\x78\x20\x6a'), # --> Server starts resending from last acknowledged block
325+
(RX, b'\x02\x75\x6d\x70\x73\x20\x6f\x76'),
326+
(RX, b'\x03\x65\x72\x20\x74\x68\x65\x20'),
327+
(RX, b'\x04\x6c\x61\x7a\x79\x20\x64\x6f'),
328+
(RX, b'\x05\x67\x0a\x74\x68\x65\x20\x63'),
329+
(RX, b'\x06\x72\x61\x7a\x79\x20\x66\x6f'),
330+
(RX, b'\x07\x78\x20\x6a\x75\x6d\x70\x73'),
331+
(RX, b'\x08\x20\x6f\x76\x65\x72\x20\x74'),
332+
(RX, b'\x09\x68\x65\x20\x6c\x61\x7a\x79'),
333+
(RX, b'\x0a\x20\x64\x6f\x67\x0a\x74\x68'),
334+
(RX, b'\x0b\x65\x20\x63\x72\x61\x7a\x79'),
335+
(RX, b'\x0c\x20\x66\x6f\x78\x20\x6a\x75'),
336+
(RX, b'\x0d\x6d\x70\x73\x20\x6f\x76\x65'),
337+
(RX, b'\x0e\x72\x20\x74\x68\x65\x20\x6c'),
338+
(RX, b'\x0f\x61\x7a\x79\x20\x64\x6f\x67'),
339+
(RX, b'\x10\x0a\x74\x68\x65\x20\x63\x72'),
340+
(RX, b'\x11\x61\x7a\x79\x20\x66\x6f\x78'),
341+
(RX, b'\x12\x20\x6a\x75\x6d\x70\x73\x20'),
342+
(RX, b'\x13\x6f\x76\x65\x72\x20\x74\x68'),
343+
(RX, b'\x14\x65\x20\x6c\x61\x7a\x79\x20'),
344+
(RX, b'\x15\x64\x6f\x67\x0a\x74\x68\x65'),
345+
(RX, b'\x16\x20\x63\x72\x61\x7a\x79\x20'),
346+
(RX, b'\x17\x66\x6f\x78\x20\x6a\x75\x6d'),
347+
(RX, b'\x18\x70\x73\x20\x6f\x76\x65\x72'),
348+
(RX, b'\x19\x20\x74\x68\x65\x20\x6c\x61'),
349+
(RX, b'\x1a\x7a\x79\x20\x64\x6f\x67\x0a'),
350+
(RX, b'\x1b\x74\x68\x65\x20\x63\x72\x61'),
351+
(RX, b'\x1c\x7a\x79\x20\x66\x6f\x78\x20'),
352+
(RX, b'\x1d\x6a\x75\x6d\x70\x73\x20\x6f'),
353+
(RX, b'\x1e\x76\x65\x72\x20\x74\x68\x65'),
354+
(RX, b'\x1f\x20\x6c\x61\x7a\x79\x20\x64'),
355+
(RX, b'\x20\x6f\x67\x0a\x74\x68\x65\x20'),
356+
(RX, b'\x21\x63\x72\x61\x7a\x79\x20\x66'),
357+
(RX, b'\x22\x6f\x78\x20\x6a\x75\x6d\x70'),
358+
(RX, b'\x23\x73\x20\x6f\x76\x65\x72\x20'),
359+
(RX, b'\x24\x74\x68\x65\x20\x6c\x61\x7a'),
360+
(RX, b'\x25\x79\x20\x64\x6f\x67\x0a\x74'),
361+
(RX, b'\x26\x68\x65\x20\x63\x72\x61\x7a'),
362+
(RX, b'\x27\x79\x20\x66\x6f\x78\x20\x6a'),
363+
(RX, b'\x28\x75\x6d\x70\x73\x20\x6f\x76'),
364+
(RX, b'\x29\x65\x72\x20\x74\x68\x65\x20'),
365+
(RX, b'\x2a\x6c\x61\x7a\x79\x20\x64\x6f'),
366+
(RX, b'\x2b\x67\x0a\x74\x68\x65\x20\x63'),
367+
(RX, b'\x2c\x72\x61\x7a\x79\x20\x66\x6f'),
368+
(RX, b'\x2d\x78\x20\x6a\x75\x6d\x70\x73'),
369+
(RX, b'\x2e\x20\x6f\x76\x65\x72\x20\x74'),
370+
(RX, b'\x2f\x68\x65\x20\x6c\x61\x7a\x79'),
371+
(RX, b'\x30\x20\x64\x6f\x67\x0a\x74\x68'),
372+
(RX, b'\x31\x65\x20\x63\x72\x61\x7a\x79'),
373+
(RX, b'\x32\x20\x66\x6f\x78\x20\x6a\x75'),
374+
(RX, b'\x33\x6d\x70\x73\x20\x6f\x76\x65'),
375+
(RX, b'\x34\x72\x20\x74\x68\x65\x20\x6c'),
376+
(RX, b'\x35\x61\x7a\x79\x20\x64\x6f\x67'),
377+
(RX, b'\x36\x0a\x74\x68\x65\x20\x63\x72'),
378+
(RX, b'\x37\x61\x7a\x79\x20\x66\x6f\x78'),
379+
(RX, b'\x38\x20\x6a\x75\x6d\x70\x73\x20'),
380+
(RX, b'\x39\x6f\x76\x65\x72\x20\x74\x68'),
381+
(RX, b'\x3a\x65\x20\x6c\x61\x7a\x79\x20'),
382+
(RX, b'\x3b\x64\x6f\x67\x0a\x74\x68\x65'),
383+
(RX, b'\x3c\x20\x63\x72\x61\x7a\x79\x20'),
384+
(RX, b'\x3d\x66\x6f\x78\x20\x6a\x75\x6d'),
385+
(RX, b'\x3e\x70\x73\x20\x6f\x76\x65\x72'),
386+
(RX, b'\x3f\x20\x74\x68\x65\x20\x6c\x61'),
387+
(RX, b'\x40\x7a\x79\x20\x64\x6f\x67\x0a'),
388+
(RX, b'\x41\x74\x68\x65\x20\x63\x72\x61'),
389+
(RX, b'\x42\x7a\x79\x20\x66\x6f\x78\x20'),
390+
(RX, b'\x43\x6a\x75\x6d\x70\x73\x20\x6f'),
391+
(RX, b'\x44\x76\x65\x72\x20\x74\x68\x65'),
392+
(RX, b'\x45\x20\x6c\x61\x7a\x79\x20\x64'),
393+
(RX, b'\x46\x6f\x67\x0a\x74\x68\x65\x20'),
394+
(RX, b'\x47\x63\x72\x61\x7a\x79\x20\x66'),
395+
(RX, b'\x48\x6f\x78\x20\x6a\x75\x6d\x70'),
396+
(RX, b'\x49\x73\x20\x6f\x76\x65\x72\x20'),
397+
(RX, b'\x4a\x74\x68\x65\x20\x6c\x61\x7a'),
398+
(RX, b'\x4b\x79\x20\x64\x6f\x67\x0a\x74'),
399+
(RX, b'\x4c\x68\x65\x20\x63\x72\x61\x7a'),
400+
(RX, b'\x4d\x79\x20\x66\x6f\x78\x20\x6a'),
401+
(RX, b'\x4e\x75\x6d\x70\x73\x20\x6f\x76'),
402+
(RX, b'\x4f\x65\x72\x20\x74\x68\x65\x20'),
403+
(RX, b'\x50\x6c\x61\x7a\x79\x20\x64\x6f'),
404+
(RX, b'\x51\x67\x0a\x74\x68\x65\x20\x63'),
405+
(RX, b'\x52\x72\x61\x7a\x79\x20\x66\x6f'),
406+
(RX, b'\x53\x78\x20\x6a\x75\x6d\x70\x73'),
407+
(RX, b'\x54\x20\x6f\x76\x65\x72\x20\x74'),
408+
(RX, b'\x55\x68\x65\x20\x6c\x61\x7a\x79'),
409+
(RX, b'\x56\x20\x64\x6f\x67\x0a\x74\x68'),
410+
(RX, b'\x57\x65\x20\x63\x72\x61\x7a\x79'),
411+
(RX, b'\x58\x20\x66\x6f\x78\x20\x6a\x75'),
412+
(RX, b'\x59\x6d\x70\x73\x20\x6f\x76\x65'),
413+
(RX, b'\x5a\x72\x20\x74\x68\x65\x20\x6c'),
414+
(RX, b'\x5b\x61\x7a\x79\x20\x64\x6f\x67'),
415+
(RX, b'\x5c\x0a\x74\x68\x65\x20\x63\x72'),
416+
(RX, b'\x5d\x61\x7a\x79\x20\x66\x6f\x78'),
417+
(RX, b'\x5e\x20\x6a\x75\x6d\x70\x73\x20'),
418+
(RX, b'\x5f\x6f\x76\x65\x72\x20\x74\x68'),
419+
(RX, b'\x60\x65\x20\x6c\x61\x7a\x79\x20'),
420+
(RX, b'\x61\x64\x6f\x67\x0a\x74\x68\x65'),
421+
(RX, b'\x62\x20\x63\x72\x61\x7a\x79\x20'),
422+
(RX, b'\x63\x66\x6f\x78\x20\x6a\x75\x6d'),
423+
(RX, b'\x64\x70\x73\x20\x6f\x76\x65\x72'),
424+
(RX, b'\x65\x20\x74\x68\x65\x20\x6c\x61'),
425+
(RX, b'\x66\x7a\x79\x20\x64\x6f\x67\x0a'),
426+
(RX, b'\x67\x74\x68\x65\x20\x63\x72\x61'),
427+
(RX, b'\x68\x7a\x79\x20\x66\x6f\x78\x20'),
428+
(RX, b'\x69\x6a\x75\x6d\x70\x73\x20\x6f'),
429+
(RX, b'\x6a\x76\x65\x72\x20\x74\x68\x65'),
430+
(RX, b'\x6b\x20\x6c\x61\x7a\x79\x20\x64'),
431+
(RX, b'\x6c\x6f\x67\x0a\x74\x68\x65\x20'),
432+
(RX, b'\x6d\x63\x72\x61\x7a\x79\x20\x66'),
433+
(RX, b'\x6e\x6f\x78\x20\x6a\x75\x6d\x70'),
434+
(RX, b'\x6f\x73\x20\x6f\x76\x65\x72\x20'),
435+
(RX, b'\x70\x74\x68\x65\x20\x6c\x61\x7a'),
436+
(RX, b'\x71\x79\x20\x64\x6f\x67\x0a\x74'),
437+
(RX, b'\x72\x68\x65\x20\x63\x72\x61\x7a'),
438+
(RX, b'\x73\x79\x20\x66\x6f\x78\x20\x6a'),
439+
(RX, b'\x74\x75\x6d\x70\x73\x20\x6f\x76'),
440+
(RX, b'\x75\x65\x72\x20\x74\x68\x65\x20'),
441+
(RX, b'\x76\x6c\x61\x7a\x79\x20\x64\x6f'),
442+
(RX, b'\x77\x67\x0a\x74\x68\x65\x20\x63'),
443+
(RX, b'\x78\x72\x61\x7a\x79\x20\x66\x6f'),
444+
(RX, b'\x79\x78\x20\x6a\x75\x6d\x70\x73'),
445+
(RX, b'\x7a\x20\x6f\x76\x65\x72\x20\x74'),
446+
(RX, b'\x7b\x68\x65\x20\x6c\x61\x7a\x79'),
447+
(RX, b'\x7c\x20\x64\x6f\x67\x0a\x74\x68'),
448+
(RX, b'\x7d\x65\x20\x63\x72\x61\x7a\x79'),
449+
(RX, b'\x7e\x20\x66\x6f\x78\x20\x6a\x75'),
450+
(RX, b'\x7f\x6d\x70\x73\x20\x6f\x76\x65'),
451+
(TX, b'\xa2\x7f\x7f\x00\x00\x00\x00\x00'), # --> This block is acknowledged without issues
452+
(RX, b'\x01\x72\x20\x74\x68\x65\x20\x6c'),
453+
(RX, b'\x02\x61\x7a\x79\x20\x64\x6f\x67'),
454+
(RX, b'\x03\x0a\x74\x68\x65\x20\x63\x72'),
455+
(RX, b'\x04\x61\x7a\x79\x20\x66\x6f\x78'),
456+
(RX, b'\x05\x20\x6a\x75\x6d\x70\x73\x20'),
457+
(RX, b'\x06\x6f\x76\x65\x72\x20\x74\x68'),
458+
(RX, b'\x07\x65\x20\x6c\x61\x7a\x79\x20'),
459+
(RX, b'\x08\x64\x6f\x67\x0a\x74\x68\x65'),
460+
(RX, b'\x09\x20\x63\x72\x61\x7a\x79\x20'),
461+
(RX, b'\x0a\x66\x6f\x78\x20\x6a\x75\x6d'),
462+
(RX, b'\x0b\x70\x73\x20\x6f\x76\x65\x72'),
463+
(RX, b'\x0c\x20\x74\x68\x65\x20\x6c\x61'),
464+
(RX, b'\x0d\x7a\x79\x20\x64\x6f\x67\x0a'),
465+
(RX, b'\x0e\x74\x68\x65\x20\x63\x72\x61'),
466+
(RX, b'\x0f\x7a\x79\x20\x66\x6f\x78\x20'),
467+
(RX, b'\x10\x6a\x75\x6d\x70\x73\x20\x6f'),
468+
(RX, b'\x11\x76\x65\x72\x20\x74\x68\x65'),
469+
(RX, b'\x12\x20\x6c\x61\x7a\x79\x20\x64'),
470+
(RX, b'\x13\x6f\x67\x0a\x74\x68\x65\x20'),
471+
(RX, b'\x14\x63\x72\x61\x7a\x79\x20\x66'),
472+
(RX, b'\x15\x6f\x78\x20\x6a\x75\x6d\x70'),
473+
(RX, b'\x16\x73\x20\x6f\x76\x65\x72\x20'),
474+
(RX, b'\x17\x74\x68\x65\x20\x6c\x61\x7a'),
475+
(RX, b'\x18\x79\x20\x64\x6f\x67\x0a\x74'),
476+
(RX, b'\x19\x68\x65\x20\x63\x72\x61\x7a'),
477+
(RX, b'\x1a\x79\x20\x66\x6f\x78\x20\x6a'),
478+
(RX, b'\x1b\x75\x6d\x70\x73\x20\x6f\x76'),
479+
(RX, b'\x1c\x65\x72\x20\x74\x68\x65\x20'),
480+
(RX, b'\x1d\x6c\x61\x7a\x79\x20\x64\x6f'),
481+
(RX, b'\x1e\x67\x0a\x74\x68\x65\x20\x63'),
482+
(RX, b'\x1f\x72\x61\x7a\x79\x20\x66\x6f'),
483+
(RX, b'\x20\x78\x20\x6a\x75\x6d\x70\x73'),
484+
(RX, b'\x21\x20\x6f\x76\x65\x72\x20\x74'),
485+
(RX, b'\x22\x68\x65\x20\x6c\x61\x7a\x79'),
486+
(RX, b'\xa3\x20\x64\x6f\x67\x0a\x00\x00'),
487+
(TX, b'\xa2\x23\x7f\x00\x00\x00\x00\x00'),
488+
(RX, b'\xc9\x3b\x49\x00\x00\x00\x00\x00'),
489+
(TX, b'\xa1\x00\x00\x00\x00\x00\x00\x00'), # --> Transfer ends without issues
490+
]
491+
with self.network[2].sdo[0x1008].open('r', block_transfer=True) as fp:
492+
data = fp.read()
493+
self.assertEqual(data, 39 * 'the crazy fox jumps over the lazy dog\n')
494+
190495
def test_writable_file(self):
191496
self.data = [
192497
(TX, b'\x20\x00\x20\x00\x00\x00\x00\x00'),

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