When I had this issue I just bought some cheap wifi 'smart sockets' which had some open-source firmware available and reflashed them. They even support reportin

When I had this issue I just bought some cheap wifi 'smart sockets' which had some open-source firmware available and reflashed them. They even support reporting the voltage and current draw from the socket (though not particularly accurately) and toggling the power through a POST (with a password if set). Was very useful for power cycling various bits of hardware remotely.