bolidJS

Need some help with reading characteristic. I have a custom service and characteristics for writing to my device and reading from it. Writing works perfect. Value from read I just load from a global (FuelLevel) that I update every second in a setInterval. I know its updating because I can log it in console. When I read it from WebBluetooth app I only get the initial value that the global was loaded from but no updates. I am pretty sure I am missing something in the setServices descriptor.

NRF.setServices({
  0xBCDE : {
    0xABCD : {
      value : [0,0,0,0,0,0],
      writable : true,
      onWrite : function(evt) {
        bolidControl(evt);    
      }
    },
    0xABCE: { // fuel
      readable : true,
      value : [FuelLevel,0xAA]
    }
  }
},{ advertise: [ 'BCDE' ] });