Microbit as Eddystone beacon

OK, I am not an expert on Eddystone beacons. I have got two ordered from China so I can actually see how they use Eddystone-URL.
I have seen it demonstrated in this post (true, not with micro:bit) and since I managed to get the micro:bit work as an iBeacon, this (have it behave like an Eddystone-URL) sounded easy.
I failed to get the mBed code working, although this page does have nice documentation, and when trying to adapt the BLE API code that Dough posted I also failed up to now.

I used the Eddystone URL script to create:

setInterval(function() {
  NRF.setName('Testing Espruino');
  NRF.setAdvertising({
    0x10 : [
        0x03,  // Length of Service List
        0x03,  // Param: Service List
        0xAA, 0xFE,  // Eddystone ID
        0x13,  // Length of Service Data
        0x16,  // Service Data
        0xAA, 0xFE, // Eddystone ID
        0x10,  // Frame type: URL
        0xF8, // Power
        0x03, // https://
        'g',
        'o',
        'o',
        '.',
        'g',
        'l',
        '/',
        'a',
        '0',
        'm',
        'n',
        's',
        'S',]});
}, 30000);

The name-change works, but as soon as I scan it, I receive an error:

Uncaught Error: Got BLE error code 12
 at line 25 col 15
        'S',]});
              ^
in function called from system

It only happens when I use an app, not right away. The name-change does work however. No Eddystone related info is shown though.
If I make the URL short enough, no error is thrown, but the lack of info remains and no tools that scan for beacons recognise the microbit as a beacon.

That is as far as I got. Hope you can help me. Thanks! :)

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Looks like the conversation has now moved to: http://forum.espruino.com/conversations/284474/#13123443

Sorry about that :)

Just in case someone comes looking for the answer here. The video + write-up are available: Turn your BBC micro:bit into an Eddystone-URL beacon using Espruino

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