Documentation: dockerized WOL packet forwarding

[luzik]

There is no info in documentation on how to forward WakeOnLan packets from container.
When using HA in docker there are two options:

network_mode: host (docker compose version) as container attribute - but this can be dangerous.

second option is to change ha-samsungtv-smart broadcast_address to your network with 255 in last octet ex. 192.168.X.255 (255.255.255.255 - won't work without network_mode: host)

And in your distro /etc/sysctl.conf append those two lines

net.ipv4.conf.all.bc_forwarding = 1
net.ipv4.conf.br-XXX.bc_forwarding = 1

Where br-XXX is name of interface with your local docker interface that HA is using

You can also adopt
https://github.com/dhutchison/container-images/blob/master/homebridge/configure_docker_networks_for_wol.sh script