public CharacteristicsBuilder addCharacteristic(BluetoothGattCharacteristic characteristic) {
            this.bluetoothGattCharacteristics.add(characteristic);
            return this;
        }
Adds a {@link BluetoothGattCharacteristic}

@param characteristic        The characteristic to add
mockrxandroidble/src/main/java/com/polidea/rxandroidble2/mockrxandroidble/RxBleClientMock.java