MDBT42 - BLE Transceiver

Literally all you need is:

// change advertising
var data = {a:1,b:2};
NRF.setAdvertising({},{
  showName:false,
  manufacturer:0x0590,
  manufacturerData:JSON.stringify(data)
});

// start scanning
NRF.setScan(function(d) {
  console.log(d.manufacturerData);
}, { filters: [{ manufacturerData:{0x0590:{}} }] });

Now it'll automatically pick up only other devices advertising with that manufacturer data