I've multiple small projects on Raspberry Pi Zero W in mind. They are all some 3D printed parts that will have some led, sensors.
Usually, they will work independently, and some of them will be moved to some random office.
Some examples would be one clock with 6 7-digit display, that will display an hour or a timer. One would be a counter of how many people have come through a door. They are all funny personal projects.
I would like to program some NodeJS server with a small ionic(angular) app to act as front-end, in order to configure it from my smartphone. The thing is that since I will move those, and at multiple places, there isn't any open Wi-Fi. I would like to know how I can expose a website without having to connect the Raspberry Pi to a network or having to connect to an open Wi-Fi all the time?
Would it be possible to establish a Bluetooth connection with a PIN, and then connect through the angular app? if possible, have the web page opening once connected.