The resin.io team has made something like this called resin-wifi-connect[1]. It doesn't appear to be as simple as it could be, but it's prior art if you plan to

The resin.io team has made something like this called resin-wifi-connect[1]. It doesn't appear to be as simple as it could be, but it's prior art if you plan to make something more generalized. [1] https://github.com/resin-io/resin-wifi-connect https://github.com/resin-io/resin-wifi-connect