websocket tcp/udp proxy (based on websockify-c)
--verbose|-v verbose messages and per frame traffic
--daemon|-d become a daemon (background process)
--whitelist-hosts|-W LIST new-line separated target host whitelist file
--whitelist-ports|-P LIST new-line separated target port whitelist file
--pid|-p desired path of pid file. Default: '/var/run/websockify.pid'
Patch for emscripten:
https://github.com/FWGS/emscripten/commit/efcb8ecd0807c5590637812a29b4d1c7cd582719