GetDatapointValue.cpp

This sample shows how to get datapoint values via the connection API

Datapoint

Usage:

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

Pre-condition: It assumes that the following datapoints are configured:

|---------|-----------------|-----------------------------|-------------|---------------|
| Number  |  DPT            |  Name                       |  SizeInBit  |  Flags        |
|         |                 |                             |             | C R W T U I   |
|---------|-----------------|-----------------------------|-------------|---------------|
|    1    | DPT 01 - 1 bit  | Actuator A - Switch         | 1           | C - W - - -   |
|---------|-----------------|-----------------------------|-------------|---------------|
|    2    | DPT 01 - 1 bit  | Actuator A - State          | 1           | C R - T - -   |
|---------|-----------------|-----------------------------|-------------|---------------|
|    3    | DPT 01 - 1 bit  | Actuator B - Switch         | 1           | C - W - - -   |
|---------|-----------------|-----------------------------|-------------|---------------|
|    4    | DPT 01 - 1 bit  | Actuator B - State          | 1           | C R - T - -   |
|---------|-----------------|-----------------------------|-------------|---------------|

Note

Another possibility is via the device API.
See also: Sample 04_BaosDatapointValues.cpp

//
// 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/BaosTcpConnection.h>
#include <baos/protocol/Defines.h>
#include <wzcpp/features/utils.h>
 
#include <iostream>
#include <memory>
 
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 << "GetDatapointValue 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 the help command
        CommandLineOptions options;
        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 to the remote BAOS device
        BaosTcpConnection connection;
        connection.open(ipAddress);
 
 
        // Reads some datapoint values (single item per requested)
 
        // id = 2 (DPT 01 - 1 bit)
        std::cout << "Reading datapoint value id 2:" << std::endl;
        auto valueState = connection.getDpValue(2);
        if (valueState.has_value())
        {
            std::cout << "Id: 2, value: ";
            traceDatapointValue(valueState->value);
            std::cout << std::endl;
        }
 
        // id = 4 (DPT 01 - 1 bit)
        std::cout << "Reading datapoint value id 4:" << std::endl;
        valueState = connection.getDpValue(4);
        if (valueState.has_value())
        {
            std::cout << "Id 4, value: ";
            traceDatapointValue(valueState->value);
            std::cout << std::endl;
        }
 
        // Reads multiple datapoint values (multiple items per requested)
        // Return only the valid datapoints
 
        // id = 1; numbers = 100
        std::cout << "Reading datapoint value ids 1 - 100:" << std::endl;
        DatapointValueStates valueStates = connection.getDpValues(1, 100, DatapointValueFilter::ALL);
 
        // print datapoint id and it's data buffer as hex string
        for (const auto& item : valueStates)
        {
            const DatapointValueState& value = item.second;
            std::cout << "Id: " << item.first;
            std::cout << ", value: ";
            traceDatapointValue(value.value);
            std::cout << std::endl;
        }
    }
    catch (const std::exception& e)
    {
        std::cerr << "Failed: " << e.what() << std::endl;
        return -1;
    }
 
    return 0;
}