Hi all,I'm new to lwip, and I want to create a multicast receiver with lwip. My 
steps are as follow:1. Enable LWIP_IGMP;2. Set NETIF_FLAG_IGMP in 
low_level_init();3. Join multicast group, create and bind pcb;4. udp_connect to 
remote_ip (or multicast IP address? Both are tried but failed)Joining group 
returns success, and everything looks fine when program executing this. However 
the multicast doesn't work. Does any one know what I'm missing? I found 
"netif->igmp_mac_filter != NULL" in igmp_joingroup(), but it is set as NULL and 
not implemented. Do I need to implement it by myself to set the filter or it is 
OK just leave it as NULL?
Thanks a lot for your help!Best regards,Ryan Jin
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