Yes and no …
Here is the link … http://bbs.espressif.com/viewtopic.php?f=66&t=1058
but all is not well. The 4 libs DO allow multicast UDP messages to be received but the system locks up after 10 minutes or more. The libs YOU provide do NOT lock the system but don’t allow multicast either.
I just posted to the espressif link above stating the issue I discovered during my testing … the post is under review so not visible at the time I am writing this.
I suggest you note that IGMP does not work with the SDK you provide but don’t jump right now at replacing them with the download identified on the link because it has a serious bug somewhere.
I’ll let you know if espressif releases a bug-free RTOS with igmp working.