I think even basic home routers these days, have enough cpu power to handle egress filtering.
If you have an iot device, by its nature it only needs to connect to a few services and hosts.
The manufacturer can provide this in their docs, and give an automatic config url that the router uses to load its egress rules.
The rules to load are displayed and the user checks they are legit by comparing to the printed version in the manual, then clicks ok. Or something like that.
Rate limits in terms of packets per second, total bandwidth both instantaneous and over time, are set also.
If you have an iot device, by its nature it only needs to connect to a few services and hosts.
The manufacturer can provide this in their docs, and give an automatic config url that the router uses to load its egress rules.
The rules to load are displayed and the user checks they are legit by comparing to the printed version in the manual, then clicks ok. Or something like that.
Rate limits in terms of packets per second, total bandwidth both instantaneous and over time, are set also.