`unetsocket_receive` should check for protocol number before returning a msg

[mchitre]

Currently the example doesn't check protocol number, and so for larger datagrams, user will see each fragment, which he should not.

[notthetup]

Shouldn't this happen inside unetsocket_receive? The user (in this case rxdata.c) should just get all the Datagrams with the protocol set to DATA or >=USER. And if the socket is bound to a specific protocol, then ONLY that protocol. But that filtering should be done inside the unetsocket_receive.

[mchitre]

Yes, correct