René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Problem with SDO Block Transfer (+workaround)","articleBody":"Hi, if i try a SDO download with block transfer like in the docs, but without crc, i.e.\n\n    FIRMWARE_PATH = '/path/to/firmware.bin'\n    FILESIZE = os.path.getsize(FIRMWARE_PATH)\n    \n    with open(FIRMWARE_PATH, 'rb') as infile,\n            node.sdo['Firmware'].open('wb', size=FILESIZE, block_transfer=True, request_crc_support=False) as outfile:\n  \n      # Iteratively transfer data without having to read all into memory\n      while True:\n          data = infile.read(1024)\n          if not data:\n              break\n          outfile.write(data)\n\nthe transfer ends after one or two sub blocks. The last SDO from the client has the invalid payload=DD 00 00 00 00 00 00 00. The transfer is working without the 1024 chunk. Just use data = infile.read() or a chunk size of 7*1024. ","author":{"url":"https://github.com/DrJMH","@type":"Person","name":"DrJMH"},"datePublished":"2025-10-31T10:32:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/618/canopen/issues/618"}