After a few month of working with conn we found some short-comings to it that need to be fixed in later iterations. This issue tries to collect these.

• connection-less support for connection-less protocols (goal: easy integration of simple lightweight stacks)
• connection-bound support for connection-less protocols if stack requires connections (goal: easy integration of full-featured stacks (e.g. lwIP))
• thread-shared connections (see POSIX sockets: open socket is bound to a specific thread #4388)
• asynchronous send/receive (select)
• non-blocking read/write
• options

... Feel free to add to this