Add firmware update service

advanced/esphome/nspanel_esphome_prebuilt.yaml

@@ -26,6 +26,18 @@ packages:
   core_package: !include ./nspanel_esphome_core.yaml  # Core package
   upload_tft_package: !include ./nspanel_esphome_addon_upload_tft.yaml  # Core package
 
+api:
+  services:
+    - service: firmware_update
+      variables:
+        url: string
+      then:
+        - ota_http.flash:
+            url: !lambda return url.c_str();
+            verify_ssl: false
+        - lambda: |-
+            static const char *const TAG = "prebuilt.button.bt_firmware_update";
+            ESP_LOGE(TAG, "Firmware update failed!");
 button:
   - name: Factory reset
     platform: factory_reset