AMT streams timeout after 4 minutes

When joining multicast streams via AMT, the stream times out after 4 mins. It appears that the AMT gw on the end host is not refreshing state by sending membership updates periodically. This can be seen by watching streams via the Multicast Menu @ https://multicastmenu.herokuapp.com/

Requires 4.0.0 as that's the version with AMT GW (RFC7450)

Edited Sep 02, 2021 by lenny

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