remaining issues

[ahuangfeng]

• [ ]
  You may elaborate why a structure similar to TCP one is not used here:
  grouping tcp-client-grouping:
  +-- remote-address
  +-- remote-port?
  +-- local-address?
  | {local-binding-supported}?
  +-- local-port? inet:port-number | {local-binding-supported}?
  (*) also clarify why the case where the remote address is a name is not supported here for UDP.

• [ ]
  grouping udp-client-grouping
  MED: You may explain how to cover the case of multiple addresses/port numbers are used to reach the same server instance. For example, the case of dual-stack.

• [ ]
  grouping udp-client-grouping
  Specifies an IP address of the UDP client. (Or the remote peer?)

• udp-server
  how to cover when the server is reachable over ipv4 and ipv6