Discovering Ruuvi Tag's MAC address and more - DG12/ruuvi.boards.c GitHub Wiki

Bluetooth devices have a 48 bit identifier BD_ADDR displayed as xx:xx:xx:xx:xx:xx.

These address can be either : RANDOM STATIC which have the most two significant bits on and therefore begin with C, D, E or F for example: C4:C1:A5:FB:6D:45 or PUBLIC addresses where the first 3 bytes are a company ID as assigned by IEEE for a fee. All company IDs are less than 3FFFFF which avoids conflict with RANDOM addresses.

For Nordic devices, like nRF52832 a random 64 bit string is writtten to NRF_FICR->DEVADDR during manufacture. Most Nordic and hence Ruuvi firmware use this to generate a BD_ADDR.

The Ruuvi firmware replies to 'scan response's with the string Ruuivxxxx where xxxx are the 2 low order bytes of the BD_ADDR. From the previous example Ruuvi6D45. Since using only those bytes the odds of 2 devices in any given bluetooth network (expected to be limited in scope) are 1:65,535, these should be significant to identify a particular device in down stream applications.

As the BD_ADDR is generated in firmware it is possible to customize it to be a PUBLIC address with a company ID portion registered with the IEEE.

Apps ruuvi.station for android and ruuvi.station.ios for iPhone will discover tags and allow you to add them.

Ruuvi tags firmware versions 3.29.1 response to NFC read includes MAC address.

There is a great application that runs on a Mac at Balda Ruuvi Discovery

If you already have ruuviCollector running you can list ALL the MAC address in the database using:

influx -precision rfc3339 -database ruuvi -host MyRpi

SELECT last(mac), count(temperature) FROM ruuvi.autogen.ruuvi_measurements GROUP BY mac;

Either directly on the raspberry pi or from another "host" where influx is installed.

This may take a little while (2-3 minutes) if you are running the ruuviCollector on a tiny little Pi Zero.

If you have curl installed you can use something like:

time curl --silent --show-error --get 'http://pi93graf:8086/query?' --data-urlencode "db=ruuvi"
--data-urlencode "q=SELECT mac, last(temperature) FROM ruuvi.autogen.ruuvi_measurements GROUP BY mac"

But the output is hard (for humans) to unscramble.