uptime sensors (#998)

nspanel_esphome.yaml

@@ -81,6 +81,8 @@ time:
               id: refresh_datetime
     on_time_sync:
       then:
+        - component.update: api_timestamp
+        - component.update: device_timestamp
         - logger.log: "System clock synchronized"
         - script.execute:
             id: refresh_datetime
@@ -856,10 +858,26 @@ binary_sensor:
 ##### START - SENSOR CONFIGURATION #####
 sensor:
 
-  ##### Uptime Template #####
-  - name: ${device_name} Last started
-    id: last_started
+  ##### Uptime Sensors #####
+  - name: ${device_name} Uptime seconds
+    id: uptime_sec
+    platform: uptime
+    internal: true
+
+  - name: ${device_name} API uptime
+    id: api_timestamp
     platform: template
+    lambda: 'return id(time_provider).now().timestamp;'
+    internal: false
+    device_class: timestamp
+    entity_category: diagnostic
+    accuracy_decimals: 0
+    update_interval: never
+
+  - name: ${device_name} Device uptime
+    id: device_timestamp
+    platform: template
+    lambda: 'return (id(time_provider).now().timestamp - id(uptime_sec).state);'
     internal: false
     device_class: timestamp
     entity_category: diagnostic
@@ -1351,9 +1369,6 @@ display:
         - lambda: id(disp1).set_component_text_printf("boot.esph_version", "%s", "${version}"); ### esphome-version ###
         - wait_until:
             api.connected
-        - sensor.template.publish:
-            id: last_started
-            state: !lambda 'return id(time_provider).utcnow().timestamp;'
         - lambda: id(disp1).set_component_text_printf("boot.ip_addr", "%s", id(ip_address).state.c_str());
         - lambda: |-
             auto ha_event = new esphome::api::CustomAPIDevice();