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

Sun 2020.04.19

Hi @David1234321 glad to see the progress.

Did you get the quick demo link #3 post transfering data back and forth to the MDBT42Q working?

'how can I "save" the user MAC that saw the message '

Please check out the functions here that make up the NRF class, then once the desired data has been collected, we'll work on the save part.

http://www.espruino.com/Reference#t_l_NRF_getAddress

Just yesterday, a link resurfaced to what @AkosLukacs previously published, but using the magnometer on a Puck, which the MDBT42Q doesn't have. Please read over what is a close working example to what I believe you are after.

Dynamic reading of BLE characteristic?

code in post #5 link there

'how can I add more information in the message ? another small message?'

See heading 'An Example' for instructions on URL shortening:

https://www.espruino.com/Eddystone

or are you after appending values as information to that URL?

https://en.wikipedia.org/wiki/Query_string

'I don't want QR code'

Is it possible what is really desired is how NFC works as the indication is to use a phone to pull floor detail from each device?

'NFC tag programmable from JavaScript (when an antenna is connected)'
https://www.espruino.com/MDBT42Q

https://www.espruino.com/NFCTag

https://www.espruino.com/Reference#l_NRF_NFCon