How can I send IGMP Join/Leave report with TCP/IP stack enabled?

[covsh]

Hello,
I'm using Mongoose with TCP/IP stack enabled.
How can I send IGMP v2 Join/Leave report?
Previously, I used Mongoose + Lwip and sending IGMP was simple (igmp_joingroup and igmp_leavegroup).

(My question is not about the IGMP packet structure, it is about how to send such packet)

[scaprile]

IGMP = Internet Group Management Protocol; part of the TCP/IP protocol stack handling multicast
If you were using lwIP, you were using lwIP functions for that
Mongoose (currently) does not support multicast.