The config flow only probed 49154/49155, so appliances whose local
CoAP/DTLS API binds elsewhere in the ephemeral range (e.g. a dishwasher
answering on 49153) could never be added.
Add a fast UDP liveness sweep across 49152-49160 that uses the ICMP
port-unreachable / ECONNREFUSED asymmetry to find the live port(s)
before attempting the expensive DTLS handshake. Closed ports fall out
immediately; a live-but-silent port is kept as a candidate. The real
handshake then runs only against discovered ports, preferring the
historically known 49154/49155 when several look live.
Also drop the probe's /device/0 GET deadline from a bare 15s literal to
a named PROBE_GET_TIMEOUT_S constant (10s) — the slowest observed full
dump is ~8s, and 10s matches the per-resource read timeout used
elsewhere.
Bumps version to 0.5.0.
Marc Billow
00c3ebaf75