Display Modbus server errors in slave example

Change-Id: I08d37d98b916f54986233e1a197b289464afbd32
Reviewed-by: Karsten Heimrich <karsten.heimrich@theqtcompany.com>

2 files changed, 12 insertions, 0 deletions

diff --git a/examples/serialbus/modbus/slave/mainwindow.cpp b/examples/serialbus/modbus/slave/mainwindow.cpp
index 7511706..6f29d9c 100644
--- a/examples/serialbus/modbus/slave/mainwindow.cpp
+++ b/examples/serialbus/modbus/slave/mainwindow.cpp
@@ -93,9 +93,19 @@ void MainWindow::on_connectType_currentIndexChanged(int index)
     } else {
         connect(modbusDevice, &QModbusClient::stateChanged,
                 this, &MainWindow::onStateChanged);
+        connect(modbusDevice, &QModbusServer::errorOccurred,
+                this, &MainWindow::handleDeviceError);
     }
 }
 
+void MainWindow::handleDeviceError(QModbusDevice::ModbusError newError)
+{
+    if (newError == QModbusDevice::NoError || !modbusDevice)
+        return;
+
+    ui->errorLabel->setText(modbusDevice->errorString());
+}
+
 void MainWindow::on_connectButton_clicked()
 {
     bool intendToConnect = (modbusDevice->state() == QModbusDevice::UnconnectedState);
diff --git a/examples/serialbus/modbus/slave/mainwindow.h b/examples/serialbus/modbus/slave/mainwindow.h
index ca5c06f..c3802bd 100644
--- a/examples/serialbus/modbus/slave/mainwindow.h
+++ b/examples/serialbus/modbus/slave/mainwindow.h
@@ -76,6 +76,8 @@ private Q_SLOTS:
 
     void on_connectType_currentIndexChanged(int);
 
+    void handleDeviceError(QModbusDevice::ModbusError newError);
+
 private:
     void setupDeviceData();
     void setupWidgetContainers();