Scope

• Use RSocket and friends instead of OpenC Posix functions to help with performance, bugs and bearer management problems.
• Implement a QAbstractSocketEngine for Symbian
• Look into Qt Bearer Management code, needs to be ported too
• Look at native system proxy for Symbian code- done and in 4.7.2 already
• Reduce the dependency to OpenC

Test plan

• Everything in tests/auto/network.pro
• qtcpsocket (in gui.pro)
• We also need to identify some network using tests in QML / Webkit to verify higher layer users of QtNetwork
• Platforms: 5.0 (5800), s3 (N8), winscw emulator?
  • SDK emulator is known broken as the winsock shim doesn't support non blocking IO
    • PDK / nokia RND emulator could use the real TCP/IP stack
    • Nokia Qt SDK doesn't include WINSCW emulator
• We need to regularly test & compare with previous results & and compare with reference open C implementation
  • WLAN testing is inherently unstable
  • CI infrastructure can't help us - it doesn't test symbian except compilation.
  • Shane has some lashed together with gaffa tape scripts + runonphone which was used to do this on file engine branch
  • open C reference should probably be master + test fixes, but check test fixes don't regress open C. Also we want to use the same version of master in both places.
• we do need CI to check we aren't breaking other platforms (does it have a mode that only runs tests?)

Removed features

• socket handles can't be used with open C functions
• we won't adopt open C sockets

Probable Symbian Bugs

• WLAN connections drop with KErrNotReady (-18) socket error during active TCP connections, which makes tests unstable
• if client closes a localhost socket, before the server accepts it, then the accept succeeds but select never completes
  • qtcpsocket, disconnectWhileConnectingNoEventLoop test case reproduces this every time
  • yielding the client thread so the accept comes before close makes the test pass
• First outgoing UDP packet is always dropped if socket doesn't have an explicit RConnection but a connection is up
  • All outgoing UDP packets are dropped while starting a connection implicitly (this isn't a bug, but a feature)
  • UDP packet drops have KErrWouldBlock on S^1 but KErrNone on S^3

Compatibility issues that aren't really bugs

• localhost resolves to IPv6 ::1 rather than 127.0.0.1
• binding to any address returns IPv6 Any (0:0:0:0:0:0:0:0) from localname rather than IPv4 Any (0.0.0.0)