Server now binds on both IPv4 (0.0.0.0) and IPv6 (::) by default.
Uses tokio::select! to accept from whichever listener has a connection.
New flags:
--listen <addr> IPv4 listen address (default: 0.0.0.0, "none" to disable)
--listen6 <addr> IPv6 listen address (default: ::, "none" to disable)
Examples:
btest -s # listen on both v4 and v6
btest -s --listen6 none # IPv4 only
btest -s --listen none # IPv6 only
btest -s --listen 192.168.1.1 # specific IPv4 address
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>