The capture settled it: the 7760 keeps the transport chatting (pings answered,
no socket error, no loss) while CI-V data simply stops, the in-place reopen is
ignored, and only a fresh session brings it back. So: one reopen attempt at
10 s — kept, it is free and the log will say if a firmware ever honours it —
and at 15 s the link is failed deliberately so the manager rebuilds it,
halving the outage. Also: the recovered-acknowledgement now sits on the DATA
packet, not on any packet — pings were toggling the detector, 160 reopens in
thirty seconds all logged as recoveries that never happened.