DatapointValueIndication.cpp

This sample shows how to register a callback function for datapoint value indications via the connection API.

Usage:

DatapointValueIndication <ip_address>
// e.g.:
DatapointValueIndication 10.0.0.102

//
// Copyright (c) 2002-2026 WEINZIERL ENGINEERING GmbH
// All rights reserved.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DAMAGES OR OTHER LIABILITY,
// WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
//
 
#include "Helper.h"
 
#include <baos/Sdk.h>
#include <baos/ip/BaosIpv4Device.h>
#include <baos/ip/BaosTcpConnection.h>
#include <baos/protocol/Defines.h>
 
#include <iostream>
#include <memory>
#include <thread>
 
using utility::CommandLineOptions;
using wz::baos::setBaosLogLevel;
using namespace wz::baos;
using namespace wz::baos::ip;
using namespace wz::baos::protocol;
 
/******************************************
** Anonymous namespace
*******************************************/
 
namespace
{
 
void traceDatapointValue(const DatapointValue& dpValue)
{
    std::cout.fill('0');
    std::cout << std::hex << std::uppercase;
    for (auto& item : dpValue)
    {
        std::cout << std::setw(2) << static_cast<std::int32_t>(item) << " ";
    }
    std::cout << std::nouppercase << std::dec;
}
 
}  // end anonymous namespace
 
/******************************************
** Main
*******************************************/
 
int main(int argc, char* argv[])
{
    try
    {
        std::cout << "******************************************" << std::endl;
        std::cout << "DatapointValueIndication sample" << std::endl;
        std::cout << "******************************************" << std::endl;
        std::cout << std::endl;
 
        // Reduce log messages
        setBaosLogLevel(wz::baos::LogLevel::warn);
 
        // The CommandLineOptions::parse function
        // validates the arguments and handles also the help command
        CommandLineOptions options;
        options.setDurationOptionSupported(true);
        options.parse(argc, argv);
        if (options.wasHelpdisplayed())
        {
            return 0;
        }
 
        // Get the ip address from the parsed command line options
        const std::string ipAddress = options.getIpAddress();
        std::cout << " Connection requested for " << ipAddress << std::endl;
 
        // Create a TPC/IP connection with the remote BAOS device
        BaosTcpConnection connection;
        connection.open(ipAddress);
 
        // register callback function for datapoint value indications
        connection.setDatapointValueIndCallback(
            [&connection](const DatapointValueStates& valueStates)
            {
                for (const auto& item : valueStates)
                {
                    const DatapointValueState& value = item.second;
 
                    std::cout << "Received datapoint value indication for id " << item.first;
                    std::cout << ", value: ";
                    traceDatapointValue(value.value);
                    std::cout << std::endl;
                }
            });
 
        // Default behaviour is interactive: wait for user input.
        // For automated runs the sample can terminate automatically after N seconds.
        if (options.isInteractive())
        {
            // Wait for Enter, all indications will be shown in the callback event handlers.
            std::cout << "Press [Enter] to exit the application ..." << std::endl;
            std::getchar();
        }
        else
        {
            // Wait for End, all indications will be shown in the callback event handlers.
            const std::int32_t durationSeconds = options.getDurationSeconds();
            std::cout << "Listening for indications for " << durationSeconds << " seconds ..." << std::endl;
            std::this_thread::sleep_for(std::chrono::seconds(durationSeconds));
        }
    }
    catch (const std::exception& e)
    {
        std::cerr << "Failed: " << e.what() << std::endl;
        return -1;
    }
 
    return 0;
}