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GatewayClient gw = new GatewayClient(new ConnectionInfo(ConnectionType.ZIGBEE_UART, "/dev/ttyUSB0"));
...
// This is an example of using the Protocol Passthrough API, with a zigbee message formed as a json string.
// The zigbee message we're forming is a Zone Enroll Response Command (see ZCL Spec Section 8.2.2.3.1)
Device device = gw.getDevice(id);
Optional<Property> protocolProperty = device.getCachedProperty(PropertyNames.PROTOCOL_PROPERTY_NAME);
if (protocolProperty.isPresent()) {
    Property p = protocolProperty.get();
    JsonObject jsonObject = jsonParser.parse(p.getValue()).getAsJsonObject();
    
    ZCLUnicastMessageBuilder builder = new ZCLUnicastMessageBuilder();
    builder.setGatewayAPIVersion(GatewayClient.getApiVersion());
    builder.setProtocolName("zigbee");
    builder.setProtocolVersion(3);
    builder.setNodeID(jsonObject.get(ZigBeeMessageTypeAdapter.NODE_ID_KEY).getAsString());
    builder.setEndpointID(jsonObject.get(ZigBeeMessageTypeAdapter.ENDPOINT_ID_KEY).getAsString());
    builder.setClusterID(IAS_ZONE_CLUSTER_ID);
    builder.setResponseOptions(ZigBee.FrameConstants.RESPONSE_OPTIONS_APS_RESPONSE.toBitmap8());
    builder.setFrameControl(ZigBee.FrameConstants.FRAME_CONTROL_CLIENT_TO_SERVER_CLUSTER_CMD.toBitmap8());
    builder.setCommandID(ZONE_ENROLL_RESPONSE_ID);
    // Zone Enroll Response:
    // Field 1: 00 - enroll success
    // Field 2: 01 - zone id
    // therefore, final payload is: 0x0001 
    builder.setPayload("0x0001");
    ZCLUnicastMessage message = builder.build();
    
    devicegw.sendProtocolMessage(message.toJson())
          .thenAccept(jsonResponse -> System.out.println(jsonResponse));
}