[lwip-devel] [bug #39145] IGMP membership report for 224.0.0.1

[Tomáš Poruba]

Follow-up Comment #2, bug #39145 (project lwip):

Hi,

I use lwip 1.4.1. I move the fix of this problem from lwip 2.0.0, it is in
igmp_report_groups function:

/* Skip the first group in the list, it is always the allsystems group added
in igmp_start() */
  if(group != NULL) {
    group = group->next;
}

I join to six multicast groups in  my app. The last joined group is assigned
to igmp_group_list. When netif is down and up it reports a the allsystems
group (because it is last no first in list) + my five multicast IPs. The sixth
IP address is not reported.

When I take a look on lwip 2.0.0 source code, there shoud be the same
problem.

Michaels fix is working and finaly i have to use

  while (group != NULL) {
        if ((group->netif == netif) && (group->next != NULL)) {
      igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
    }
    group = group->next;
  }


Regards

Tomas Poruba


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