network layer improvements

[totaam]

tracker ticket:

• native ssl support #1252 SSL
• delay SSL socket wrapping #1504 delay SSL socket wrapping
• IPv6 issues #1594 IPv6
• better TCP_NODELAY handling: only use it when it is useful #619 better TCP_NODELAY handling: only use it when it is useful
• UDP transport #639 UDP transport
• UDP improvements #1669 UDP improvements
• catch limited bandwidth issues sooner #999 catch limited bandwidth issues sooner
• detect bad connection and warn the user #401 detect bad connection and warn the user
• handle connection issues, session events, network drop outs, power events, etc #540 handle connection issues, session events, network drop outs, power events, etc
• re-implement bandwidth constraint option #417 re-implement bandwidth constraint option
• fix websockify bottleneck #1134 websockify
• signals SA_RESTART siginterrupt etc #1591 signals SA_RESTART siginterrupt etc
• #1338 html mode WebRTC transport
• get rid of websockify #2121 replace websockify and websocket-client with custom code
• less copying to reassemble packets #2139 less copying to reassemble packets
• detect lower level network attributes #1863 detect lower level network attributes
• XPRA does not recover from network congestion (even when network does) #2090 XPRA does not recover from network congestion (even when network does)
• tcp socks proxy support #2105 tcp socks proxy support
• Xpra Client in Listen Mode #1022 client in listen mode
• Extend Xpra proxy for terminal server deployments #675 extend xpra proxy for terminal server deployments
• let a server register with a proxy #2125 let a server register with a proxy
• enable SO_KEEPALIVE? #2420 enable SO_KEEPALIVE?
• detect slow send buffer draining pace using TCP_INFO #2421 detect slow send buffer drainging pace using TCP_INFO

Other ideas:

• protocol close: split read and write so we can flush with read closed - meh
• measure: YIELD vs NO_YIELD
• remove parse and format threads from protocol: no longer needed? (python threads are expensive)

Other links:

• srtalliance: "making video streaming better"
• webrtc
• TCP BBR: loss-based congestion control can result in abysmal throughput because it overreacts..

Older tickets:

• html5: faster network layer, input devices, etc #1424 html5 faster network layer
• support websockets in the python client #1271 support websockets in the python client
• fix websockify bottleneck #1134 websockify bottleneck
• AF_VSOCK support #983 AF_VSOCK support
• register the xpra mdns service type #731 mdns service type
• evaluate TCP_NODELAY #514 TCP_NODELAY
• efficient network receive buffer management when receiving large chunks #502 efficient network receive buffer management when receiving large chunks
• more aggressive speed tuning when bandwidth is available #418 more aggressive speed tuning when bandwidth is available
• to yield or not to yield #181 to yield or not to yield
• detect wireless links #1860 detect jittery connections

Related tickets:

• allow named pipes over the network #1454 allow named pipes over the network
• create a wireshark dissector #1188 create a wireshark dissector
• smartcard api #1255 smartcard api