Handle the addition or suppression of network interfaces/addresses

[Hugal31]

Describe the feature

Problem

Right now, the node caches the UP and RUNNING interfaces on startup, starts its listeners and caches their locators (e.g. tcp/[::]:7447 becomes tcp/192.168.0.1:7447).

However, if the node is started before a network interface, or if its IP address changes, it is not taken in account.

My particular use case is a handled device connecting over Wi-Fi to one of our multiple robots.

Solution

Automatically detect new/deleted IP addresses and update the locator list as well as the socket writing on the multicast address. On Linux, this could be done using Netlink, but it could work using a simple timer.

Alternative solution

Maybe have the user detect the network change themselves and call a function to update the locator list/multicast socket.

Additional context

I have no clue on how this would work on system other than Unix-like systems.