unset values when sensors are lost

soft/thermostat/inc/mainwindow.h

@@ -36,6 +36,7 @@ private:
 private slots:
 	void temperature_slot(unsigned idx, double val);
 	void hygro_slot(unsigned idx, double val);
+	void availability_slot(unsigned idx, bool ok);
 };
 
 #endif // MAINWINDOW_H

soft/thermostat/src/mainwindow.cpp

@@ -32,6 +32,8 @@ MainWindow::MainWindow(QWidget *parent) :
 	connect(mqttclient, SIGNAL(new_hygro(unsigned, double)),
 				   this, SLOT(hygro_slot(unsigned, double)));
 
+	connect(mqttclient, SIGNAL(new_availability(unsigned, bool)),
+				   this, SLOT(availability_slot(unsigned, bool)));
 	/*
 	 * Sensors-related layout
 	 */
@@ -77,5 +79,12 @@ void MainWindow::hygro_slot(unsigned idx, double val)
 		m_zones[idx]->set_hygro_value(val);
 	}
 }
+void MainWindow::availability_slot(unsigned idx, bool ok)
+{
+	if ((idx < NB_ZONES) && !ok) {
+		m_zones[idx]->set_hygro_value(0);
+		m_zones[idx]->set_temperature_value(0);
+	}
+}
 
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