wfview sends a ping (0x07, 0x15 bytes, its own seq and a monotonic
timestamp) every 500 ms on every stream, and so does RS-BA1. OpsLog only
ever REPLIED to the rig's pings — and the loaner IC-7760 stopped serving
CI-V data about a minute into nearly every session while the transport
stayed alive: the rig had concluded nobody was listening. Scope, TX audio
and idle numbering were each eliminated in turn before wfview's source
settled it. Pings now go out on control, CI-V and audio alike.