Send no packet only to probe the path or say a challenge back

M2 (ten thousand devices, a record each every 5 s) sent 118k packets for
80k records. A link whose packets were never full still probed for a
1,452-byte path: nothing larger would have been carried. And a sender
said a receiver's challenge back in a packet of its own, one for each
device each time the receiver started. Now a link probes once a packet
of its was full, and a challenge rides in the next packet that goes
(records, or a probe). Until then the receiver's answers there are at
most three times what came, which the answers to one packet are not;
when they are held back, the sender's probe or record sent again says it
back. M2 sends 80,036 again (docs/research/099-link-epochs.md).

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