Field bug on a Pico W: the slot freed device-side but the API client
kept free=0 with the address still allocated. send_message drops the
response when the TCP buffer is full (a boot storm makes that likely
right when HA reconnects), and nothing ever resent it - the client's
slot state is verbatim the last response received, so it stayed stale
until reboot. The cached response is current by construction, so a
pending bit retried from loop() is an idempotent resync; the
subscribe-time send heals through the same bit.
J. Nick Koston
aceff27948