Method onReadReady

app/src/IO/Drivers/Modbus.cpp:1297–1336

* @brief Handles completed Modbus read operations and publishes the result as RTU-format bytes. */

 * @brief Handles completed Modbus read operations and publishes the result as RTU-format bytes.
 */
void IO::Drivers::Modbus::onReadReady()
{
  auto* reply = qobject_cast<QModbusReply*>(sender());
  if (!reply) {
    m_lastReply = nullptr;
    return;
  }

  if (reply != m_lastReply) {
    reply->deleteLater();
    return;
  }

  m_lastReply = nullptr;

  if (reply->error() != QModbusDevice::NoError) {
    reply->deleteLater();
    return;
  }

  const QModbusDataUnit unit = reply->result();
  if (!unit.isValid() || unit.valueCount() == 0) {
    reply->deleteLater();
    return;
  }

  try {
    publishReceivedData(buildRtuFrame(unit));
  } catch (const std::exception& e) {
    qWarning() << "Modbus frame build failed:" << e.what();
  } catch (...) {
    qWarning() << "Modbus frame build failed: unknown exception";
  }

  reply->deleteLater();

  ++m_currentGroupIndex;
  if (m_currentGroupIndex < m_registerGroups.count())
    pollNextGroup();
}

/**
 * @brief Handles Modbus device state changes by starting/stopping the poll timer.