function getPeripheral(uuid) {
  // eslint-disable-next-line no-underscore-dangle
  return this.bluetooth._peripherals[uuid];
}
@description Return asked raw Peripheral, or undefined, from Bluetooth library.
@param {string} uuid - Wanted peripheral UUID.
@returns {object} Returns peripheral according to this UUID.
@example
const peripheral = bluetoothManager.getPeripheral('99dd77cba4');