OTA updates for all devices and device asking for update upon waking

Hey, I’ve got my OTA updates perfectly running with specific tokens. I now wonder about the options of updating all devices or a single user, but when I try these curl commands, nothing happens on the device end. What do I need to do to get that happening? thanks

Also wondering what I need to change in my code to allow my device to ask for updates from the server when it wakes up, incase it missed the update while asleep or off…