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.