internal static void process_queue_entry(Bluetooth_CMD btc)
        {
            if (GlucoseGattCallback.mBluetoothGatt == null)
            {
                Debug.WriteLine("Bluetooth Gatt not initialized");
                return;
            }

            BluetoothGattService        service = null;
            BluetoothGattCharacteristic characteristic;

            if (btc.service != null)
            {
                service = GlucoseGattCallback.mBluetoothGatt.GetService(btc.service);
            }
            if ((service != null) || (btc.service == null))
            {
                if ((service != null) && (btc.characteristic != null))
                {
                    characteristic = service.GetCharacteristic(btc.characteristic);
                }
                else
                {
                    characteristic = null;
                }
                if (characteristic != null)
                {
                    switch (btc.cmd)
                    {
                    case "W":
                        characteristic.SetValue(btc.data);
                        if ((characteristic.GetValue().Length > 1))
                        {
                            GlucoseGattCallback.AwaitingAck  = true;
                            GlucoseGattCallback.AwaitingData = true;
                            if (GlucoseGattCallback.Debug)
                            {
                                Debug.WriteLine("Setting await ack blocker 1");
                            }
                        }


                        Task.Run(() =>
                        {
                            try
                            {
                                if (!GlucoseGattCallback.mBluetoothGatt.WriteCharacteristic(characteristic))
                                {
                                    Debug.WriteLine("Failed in write characteristic");
                                    System.Threading.Thread.Sleep(150);
                                    if (!GlucoseGattCallback.mBluetoothGatt.WriteCharacteristic(characteristic))
                                    {
                                        Debug.WriteLine("Failed second time in write charactersitic");
                                    }
                                }
                            }
                            catch (NullPointerException e)
                            {
                                Debug.WriteLine(
                                    "Got null pointer exception writing characteristic - probably temporary failure");
                            }
                        });



                        break;

                    case "R":
                        GlucoseGattCallback.mBluetoothGatt.ReadCharacteristic(characteristic);
                        break;

                    case "N":
                        GlucoseGattCallback.mBluetoothGatt.SetCharacteristicNotification(characteristic, true);
                        System.Threading.Thread.Sleep(100);
                        poll_queue();     // we don't get an event from this
                        break;

                    case "U":
                        GlucoseGattCallback.mBluetoothGatt.SetCharacteristicNotification(characteristic, false);
                        break;

                    case "D":
                        BluetoothGattDescriptor descriptor = characteristic.GetDescriptor(
                            GattMapper.UuidForType <ClientCharacteristicConfiguration>());
                        descriptor.SetValue(btc.data);
                        GlucoseGattCallback.mBluetoothGatt.WriteDescriptor(descriptor);
                        break;

                    default:
                        Debug.WriteLine("Unknown queue cmd: " + btc.cmd);
                        break;
                    } // end switch
                }
                else
                {
                    Debug.WriteLine("Characteristic was null!!!!");
                }
            }
            else
            {
                Debug.WriteLine("Got null service error on: " + btc.service);
            }
        }