Hi,
it looks like the POSIX socket wrapper (https://riot-os.org/api/group__posix__sockets.html) is missing select() and poll() calls.
I also don't see any similar functionality at the GNRC socket level. For example, according to https://riot-os.org/api/group__net__sock__udp.html one can only wait for reading on a single UDP socket.
How is an application supposed to handle I/O on multiple sockets?
Thanks, Lars