IoT Updates with IPv6 Multicast

Could we update a billion IoT nodes from just one tiny virtual server? Could a server that is behind a completely closed inbound firewall, using no caching, no CDNs and which never accepts any inbound traffic communicate at massive scale? How can we handle flow control, with no feedback mechanism? Lets find out! https://archive.fosdem.org/2020/schedule/event/iotmulticast/ https://librecast.net/iotupd.html