iBeacons

Note: For Eddystone, see this page

iBeacon is a beacon format from Apple that allows you to transmit information which can appear as a notification on a user's iPhone.

All you need to do to use it is use the ble_ibeacon (About Modules) module:

require("ble_ibeacon").advertise({
  uuid : [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // ibeacon uuid
  major : 0x0001, // optional
  minor : 0x0001, // optional
  rssi : -59 // optional RSSI at 1 meter distance in dBm
});

Note: you'll need to get an iBeacon UUID from Apple to use this.

From then on, Espruino will broadcast to anything that will listen.

Note: Since you can't advertise while you're connected via Bluetooth LE, you will have to disconnect from your Espruino for it to start transmitting.

To turn iBeacon advertising off simply call NRF.setAdvertising({});

Advanced

require("ble_ibeacon").advertise will overwrite Espruino's advertising (name, services, etc) with the iBeacon packet.

You can use require("ble_ibeacon").get with the same options as advertise to get the array of advertising data to use, which you can feed directly into NRF.setAdvertising(), allowing you to set other options such as advertising rate.

In Espruino 1v92 and later you can also supply an array of advertising data to make Espruino send each advertising packet in turn.

For iBeacon and normal Espruino connection info:

NRF.setAdvertising([
  require("ble_ibeacon").get(...),
  {} // this will add a 'normal' advertising packet showing name/etc  
  ], {interval:100});

Or for iBeacon, Eddystone, and to report battery level:

NRF.setAdvertising([
  require("ble_ibeacon").get(...),
  require("ble_eddystone").get(...),
  { 0x180F : [95] }
  ], {interval:100});