Deployed firmwares hardcode command=0x01 (legacy from when the byte was named `version`); treating 0x01 as ping would have flagged every existing frame as a diagnostic. Keep 0x00/0x01 as normal-data and use 0x02 as the explicit ping trigger. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>