wangchen61698 commented on code in PR #10319:
URL: https://github.com/apache/nuttx/pull/10319#discussion_r1302364600
##########
net/udp/udp_send.c:
##########
@@ -146,7 +159,7 @@ void udp_send(FAR struct net_driver_s *dev, FAR struct
udp_conn_s *conn)
* header size
*/
- dev->d_len = dev->d_sndlen + UDP_HDRLEN;
+ dev->d_len = dev->d_sndlen + UDP_HDRLEN;
ipv6_build_header(IPv6BUF, dev->d_len, IP_PROTO_UDP,
dev->d_ipv6addr, conn->u.ipv6.raddr,
Review Comment:
It refer to linux defination,The argument is a pointer to an interface
index,we just need chose which net device to send multicast pkt,not to change
the address of the device
IPV6_MULTICAST_IF
Set the device for outgoing multicast packets on the
socket. This is allowed only for SOCK_DGRAM and SOCK_RAW
socket. The argument is a pointer to an interface index
(see
[netdevice(7)](https://man7.org/linux/man-pages/man7/netdevice.7.html)) in an
integer.
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