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As soon as I posted that, I realised the difference is that the first explicitly sets the service UUID, where as the second snippet does not.

If I update the second snippet to the following, it still seems to give the same error:

NRF.setAdvertising({
  0xFEAA :[
    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','/','B','3','J','0','O','c'
  ]
}, {interval:100}); 

Hi, thanks for the great post! I'm trying to get this going on a BBC MicroBit with Espruino v1.89 but running in to an Out of Memory error.

If I use this snippet, there's no issue and Chrome detects the beacon on my iOS device:

NRF.setAdvertising({
  0xFEAA : [
  0x10, // frame_type (URL)
  0xEE, // the RSSI dBm we've measured for this beacon 1 meter away
  0x03, // 3 = https://
  'g','o','o','.','g','l','/','t','Z','W',­'U','U','X'
  ]
}, {interval:100,discoverable:true,showName­:false}); 

However, if I use this snippet, I get the Out of Memory error when it finishes sending:

NRF.setAdvertising([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','/','B','3','J',­'0','O','c'],
    {interval:100});

Any thoughts?