ISO15_READ_RESPONSE was 0x10 but the firmware bit is 0x20 (0x10 is HIGH_SPEED, which pm3py lacked), so scan/rdbl/wrbl sent flags 0x19 with READ_RESPONSE never set -> firmware never listened and replied empty. The ARM firmware also ignores ISO15_APPEND_CRC (the C client adds the CRC host-side via AddCrc15), so pm3py's CRC-less frames were never answered by a real tag.
Fix flag values to match firmware include/iso15.h, add crc15 (CRC-16/X-25), and route all iso15 commands through _iso15_payload (appends CRC, sends CONNECT|HIGH_SPEED|READ_RESPONSE=0x31). Payload now byte-matches the C client getUID. Pre-existing bug, independent of the firmware rebase.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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