Location tracking

Simplified version is:

var devices = {};

NRF.setScan(function(device) {
    if (device.name && device.name.indexOf(‘Puck.js’) >= 0) {
      const data = device.data.toString().substr(-1);

      if (!devices[device.name]) {
        devices[device.name] = {
          name: device.name,
          rssi: device.rssi,
          data: data,
        };
      }
      
      const oldDevice = devices[device.name];
      
      if (device.rssi !== oldDevice.rssi) {
        devices[device.name].rssi = device.rssi;
        
        Bluetooth.println(JSON.stringify(device)­);
      }
    }
  });

Is that receiving advertising packets from a single Puck or having many advertising at the same time?