add last boot sensor

src/ha-kiosk-agent

@@ -67,6 +67,7 @@ async def main():
         'battery':              sensor.BatterySensor(device),
         'display_brightness':   sensor.DisplayBrightnessSensor(device, dbm),
         'ip_address':           sensor.IPAddressSensor(device),
+        'last_boot':            sensor.LastBootSensor(device),
         'temperature':          sensor.TemperatureSensor(device)
     };
 

src/sensor.py

@@ -4,6 +4,7 @@ import socket
 import subprocess
 import time
 
+from datetime import datetime
 from enum import Enum
 
 import ha_mqtt_discoverable
@@ -160,6 +161,25 @@ class IPAddressSensor():
         self.value = IP
 
 
+class LastBootSensor():
+    value = -1
+    mqtt_sensor = None
+
+    def __init__(self, device: Device):
+        boot_time_info = ha_mqtt_discoverable.sensors.SensorInfo(
+            name="Last boot",
+            device=device.get_mqtt_device(),
+            unique_id=f'{device.get_device_id()}_last_boot',
+            device_class='timestamp')
+        boot_time_settings = ha_mqtt_discoverable.Settings(mqtt=device.get_mqtt_settings(), entity=boot_time_info, manual_availability=True)
+        self.mqtt_sensor = ha_mqtt_discoverable.sensors.Sensor(boot_time_settings)
+        self.mqtt_sensor.set_availability(True)
+        self.mqtt_sensor.set_state(datetime.fromtimestamp(psutil.boot_time()).astimezone().isoformat())
+
+    def update_value(self):
+        pass
+
+
 class TemperatureSensor():
     value = -1
     mqtt_sensor = None
@@ -186,3 +206,4 @@ class TemperatureSensor():
             self.mqtt_sensor.set_state(newValue)
 
         self.value = newValue
+