First time user - how to seup BLE message on my MDBT42Q,2v04?

Hello Robin

1. yes, I mange to connect to my phone and use termnial to send\get text.
   
2. about "NRF class" - I guess it can get only the person how connect to the BLE Device - right ?
   because (as I understand ) when I publish the floor number ,everyone can see it -even 100 people with andorid . it will be like a billboard on the highway(which you don't know really how much people read your sign).
   
3. I have try to do as it said here https://www.espruino.com/Eddystone , but couldn't see any different between NRF.setAdvertising() and require("ble_eddystone").advertise("goo.­gl/B3J0Oc");
   is it posiable to addvertise a string and not a url?
   for example "This is the 1st floor".?
   

4. can I use another language\fonts for the addvertide? not english? Chinese\Arabic\etc..

5. if I connect the BLE to a PI -can I control on it and send differnet text every x hours using python code or whatever?

Thank you for the help