There’s a type of beacon that doesn’t send out iBeacon or Eddystone advertising. Instead, it sends out standard Bluetooth 4.0 advertising containing sensor values. This means the data can be picked up via apps, gateways, Raspberry Pis or other devices that can see Bluetooth advertising.
An example of this is the INGICS iBS01 range of beacons.
The round bit in the middle is a button that can be pressed. Here’s an example for the data from the iBS01T temperature/humidity sensor:
Additionally, the ‘event’ data gives the state of the button press.
