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twislaandClaude Opus 5.5
a0e3868934
Found by M3's shared-bus test: when the card refused a write, the retry closed the file (losing up to 3 KB of earlier chunks still in the write buffer), then truncate() extended it back with zeros. The checksum only covered the received bytes, so `put` reported success with 3 KB of zeros on the card. Now a retry gives up if the card lost data, and the finished file is read back and must hash the same before it's renamed. The card refuses a write about once in five 1.7 MB uploads, with the radio asleep as often as listening. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT