function getDiscoveredDevices(protocol) {
  const handlerDevices = this.getHandler(protocol).getDiscoveredDevices();
  return Object.values(handlerDevices).map((d) => this.mergeWithExistingDevice(d));
}
@description Get all discovered devices, and if device already created, the Gladys device.
@param {string} protocol - Protocol to filter devices.
@returns {*} Discovered devices.
@example
getDiscoveredDevices()