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

Thr 2020.04.23

Hi David, I'm near my limit on NRF understanding at the moment as I'm still trying to get tinyMQTT and a MQTT broker running on Windows10 to assist further with the advertising questions. With success with that ~1 week? I hope to do exactly what you are doing. In the mean time, lets get a few questions confirmed and maybe some others may assist.

'when I publish the floor number ,everyone can see it -even 100 people'

So, do you want those 100 people to be able to see, or do you want to block all but the five or so you give a secret key to?

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

'is it posiable to addvertise a string and not a url'

I'm not sure, but I don't see why not. In the EddyStone example, that device is a Beacon, and it's purpose is to advertise a URL, when another Android device is in close proximity.

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

As EddyStone is mentioned a lot, and there is a reference in the link above, is the intent to make your MDBT42Q behave exactly like an EddyStone beacon then?

As you mention Beacons several times, we can safely say we are not dealing with NFC and rule that out then?