Hi, thanks for your reply. I tried on ios simulator, its the same. Nope I didnt test it on sim. my intent is only send multicast on LAN. do you have any other pointer or sample git for me to run the working multicast (on LAN)? Thanks.

Hi there! sorry for late reply. I'm using react native lib - react-native-udp. ( https://github.com/tradle/react-native-udp) im not very sure in the ios implementation which API it is using..

I found out the library is using CocoaAsyncSocket under the hood. AS for now I will have to write my own ios lib to solve this issue. May I have any pointer where to start? (a swift native ios app)

im happy to have any example code for me to start as ground. im new to ios native app development, will read on these topics. Thanks!

My deployment target now is set to iOS 11 and later. Not sure what does compatible with NWConnectionGroup mean? Sorry Im still new to iOS app development.

NWConnectionGroup is a new Network framework API for multicast. For more on this, see it’s documentation. As shown in the docs, NWConnectionGroup is supported on iOS 14 and later. So, if your deployment target is iOS 14 or later, it would be compatible with NWConnectionGroup. I see. this is a bumper. We are planning to support at least iOS 12. Which is last iOS version for iPhone 6/ 6plus. The audience on iphone 6 is part of our support audience.