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By Cicero
#75697 I'm working on the standard SDK, and seeing an issue with UDP multicast messages not being received after around 4mins, more specifically about 4:20 - 4:40sec.

I've first suspected my router, which I do think if part of the problem but not entirely the culprit after reading this thread http://doityourselfchristmas.com/forums ... 42038.html .

I'm using the espconn_igmp_join((ip_addr_t *)&host_ip,(ip_addr_t *)&multicast_ip); function, but something is not right.

Anyone discovered anything in regards to this type of problem to help me out? Unicast works like a dream, but I need to get multicast working just as well.
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By Cicero
#75700 I'm using the open sdk, from pfalcon https://github.com/pfalcon/esp-open-sdk .

Seems like this might be related to the lwip implementation which also affected the Arduino environment way back when. https://github.com/esp8266/Arduino/issues/3498

I'm going to try this fix on my end.