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I`m attempting to force an out-of-gateway address using the udp_sendto () function. ex) listen IP address : 192.168.1.10 -> send IP address : 224.0.0.1

This concept takes a packet to a unicast address and sends it to a multicast address.

when i try udp_sendto(224.0.0.1), it`s pending in ip4.c: ip4_route() line 164.

I want inspiration how to fix it.

Thanks a lot for your help!

한호성
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  • Try to look here: https://stackoverflow.com/questions/50438577/implementing-lwip-multicast-on-stm32f7-freertos – user6556709 Apr 25 '19 at 05:19
  • simply Two options were changed. lwip_multicast_tx_options & lwip_igmp and Try your link. It was possible to send to a multicast address without joining the igmp group. Thank you. – 한호성 Apr 25 '19 at 05:47

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