• 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}); 
    
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