Method setSerialPortIndex

app/src/API/Handlers/ModbusHandler.cpp:375–401

* @brief Set RTU serial port by index */

 * @brief Set RTU serial port by index
 */
API::CommandResponse API::Handlers::ModbusHandler::setSerialPortIndex(const QString& id,
                                                                      const QJsonObject& params)
{
  if (!params.contains(QStringLiteral("portIndex"))) {
    return CommandResponse::makeError(
      id, ErrorCode::MissingParam, QStringLiteral("Missing required parameter: portIndex"));
  }

  const int portIndex  = params.value(QStringLiteral("portIndex")).toInt();
  auto* modbus         = IO::ConnectionManager::instance().modbus();
  const auto& portList = modbus->serialPortList();

  if (portIndex < 0 || portIndex >= portList.count()) {
    return CommandResponse::makeError(id,
                                      ErrorCode::InvalidParam,
                                      QStringLiteral("Invalid portIndex: %1. Valid range: 0-%2")
                                        .arg(portIndex)
                                        .arg(portList.count() - 1));
  }

  modbus->setSerialPortIndex(static_cast<quint8>(portIndex));

  QJsonObject result;
  result[QStringLiteral("portIndex")] = portIndex;
  result[QStringLiteral("portName")]  = portList.at(portIndex);
  return CommandResponse::makeSuccess(id, result);
}

/**
 * @brief Set RTU baud rate