- treat ICMP-driven UDP socket errors (WSAECONNRESET 10054 on Windows,
ECONNREFUSED on Linux) as packet loss in punch_udp and the KCP pump
instead of tearing the session down; KCP retransmits through them and a
truly dead link is still reaped by the pong/app-level timeouts
- resolve STUN hostnames via tokio::net::lookup_host so DNS never blocks a
runtime worker; fix the inverted non-IPv4 error message
- add enable-kcp-congestion-control option (default on): switch the turbo
profile to nc=0 so brief loss on constrained links no longer spirals into
stalls; sender-side only, no wire negotiation
- pin kcp-sys to the rustdesk-patches branch: upstream main lost the
RustDesk patches on the EasyTier sync, and this branch also wires
set_kcp_config_factory into connection setup, making the option effective
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
