Szabolcs Szekelyi 42b2f03470 Allow network interface name to be specified when joining multicast group ...

This change renames `coap_join_mcast_group` to `coap_join_mcast_group_intf`
and adds an extra `const char *ifname` parameter to specify the interface
name.

A `coap_join_mcast_group` macro is defined to maintain backwards API
compatibility.

`coap_is_mcast` has been modified to recognize IPv6-mapped IPv4 multicast
addresses. Without this `coap_network_send` treats these addresses as
unicast which makes `semdmsg` fail with EINVAL.

Examples have been updated to use the new call.

2021-03-17 17:25:31 +00:00

..

coap2

Allow network interface name to be specified when joining multicast group

2021-03-17 17:25:31 +00:00