v01d opened a new issue #3371:
URL: https://github.com/apache/incubator-nuttx/issues/3371
```
Description: The interfaces used to leave/join IGMP multicast groups is
non-standard.
RFC3678 (IGMPv3) suggests ioctl() commands to do this
(SIOCSIPMSFILTER) but
also status that those APIs are historic. NuttX implements
these ioctl
commands, but is non-standard because: (1) It does not
support IGMPv3, and
(2) it looks up drivers by their device name (e.g., "eth0")
vs IP address.
Linux uses setsockopt() to control multicast group membership
using the
IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP options. It also
looks up drivers
using IP addresses (It would require additional logic in
NuttX to look up
drivers by IP address). See
http://tldp.org/HOWTO/Multicast-HOWTO-6.html
Status: Open
Priority: Medium. All standards compatibility is important to NuttX.
However, most
the mechanism for leaving and joining groups is hidden behind
a wrapper
function so that little of this incompatibilities need be
exposed.
```
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