Use webhooks for battery

resources/settings/properties.xml

@@ -13,31 +13,44 @@
 -->
 
 <properties>
-  <property id="api_key"    type="string"></property>
+  <property id="api_key" type="string"></property>
+
+  <!-- 
+    The webhook ID is the last part of the webhook URL.
+    It is secret and should not be shared.
+    It will not be set in settings but will be 
+    generated by the application and stored in
+    persistent storage.
+  -->
+  <property id="webhook_id" type="string"></property>
 
   <!--
     Internal URL "https://homeassistant.local/api"
     External URL "https://<dynamic DNS>/api"
   -->
-  <property id="api_url"    type="string"></property>
+  <property id="api_url" type="string"></property>
 
-  <!-- Best be a public URL in order to work away from your home LAN and have a trusted HTTPS certificate -->
+  <!-- Best be a public URL in order to work away from your home LAN and have a trusted HTTPS
+  certificate -->
   <property id="config_url" type="string"></property>
 
   <!-- Decide if the menu configuration should be cached. -->
   <property id="cache_config" type="boolean">false</property>
 
-  <!-- Clear the menu configuration on next application start, and refetch, then set this back to false -->
+  <!-- Clear the menu configuration on next application start, and refetch, then set this back to
+  false -->
   <property id="clear_cache" type="boolean">false</property>
 
   <!--
-    Application timeout in seconds, except 0 for no timeout (default). After this amount of elapsed time
+    Application timeout in seconds, except 0 for no timeout (default). After this amount of elapsed
+  time
     with no activity, exit the application.
   -->
   <property id="app_timeout" type="number">0</property>
 
   <!--
-    After this time (in seconds), a confirmation dialog for an action is automatically closed and the action
+    After this time (in seconds), a confirmation dialog for an action is automatically closed and the
+  action
     is cancelled. Set to 0 to disable the timeout. The default value is 3 seconds.
   -->
   <property id="confirm_timeout" type="number">3</property>
@@ -71,4 +84,4 @@
   -->
   <property id="battery_level_refresh_rate" type="number">15</property>
 
-</properties>
+</properties>

resources/settings/settings.xml

@@ -107,4 +107,10 @@
     <settingConfig type="numeric" min="5" />
   </setting>
 
-</settings>
+  <setting
+    propertyKey="@Properties.webhook_id"
+    title="Webhook ID"
+  >
+    <settingConfig type="alphaNumeric" />
+  </setting>
+</settings>