Filter MQTT alarm JSON attributes (#52278)

homeassistant/components/mqtt/alarm_control_panel.py

@@ -55,6 +55,14 @@ CONF_PAYLOAD_ARM_NIGHT = "payload_arm_night"
 CONF_PAYLOAD_ARM_CUSTOM_BYPASS = "payload_arm_custom_bypass"
 CONF_COMMAND_TEMPLATE = "command_template"
 
+MQTT_ALARM_ATTRIBUTES_BLOCKED = frozenset(
+    {
+        alarm.ATTR_CHANGED_BY,
+        alarm.ATTR_CODE_ARM_REQUIRED,
+        alarm.ATTR_CODE_FORMAT,
+    }
+)
+
 DEFAULT_COMMAND_TEMPLATE = "{{action}}"
 DEFAULT_ARM_NIGHT = "ARM_NIGHT"
 DEFAULT_ARM_AWAY = "ARM_AWAY"
@@ -112,6 +120,8 @@ async def _async_setup_entity(
 class MqttAlarm(MqttEntity, alarm.AlarmControlPanelEntity):
     """Representation of a MQTT alarm status."""
 
+    _attributes_extra_blocked = MQTT_ALARM_ATTRIBUTES_BLOCKED
+
     def __init__(self, hass, config, config_entry, discovery_data):
         """Init the MQTT Alarm Control Panel."""
         self._state = None

tests/components/mqtt/test_alarm_control_panel.py

@@ -6,6 +6,9 @@ from unittest.mock import patch
 import pytest
 
 from homeassistant.components import alarm_control_panel
+from homeassistant.components.mqtt.alarm_control_panel import (
+    MQTT_ALARM_ATTRIBUTES_BLOCKED,
+)
 from homeassistant.const import (
     STATE_ALARM_ARMED_AWAY,
     STATE_ALARM_ARMED_CUSTOM_BYPASS,
@@ -39,6 +42,7 @@ from .test_common import (
     help_test_entity_id_update_subscriptions,
     help_test_setting_attribute_via_mqtt_json_message,
     help_test_setting_attribute_with_template,
+    help_test_setting_blocked_attribute_via_mqtt_json_message,
     help_test_unique_id,
     help_test_update_with_json_attrs_bad_JSON,
     help_test_update_with_json_attrs_not_dict,
@@ -544,6 +548,17 @@ async def test_setting_attribute_via_mqtt_json_message(hass, mqtt_mock):
     )
 
 
+async def test_setting_blocked_attribute_via_mqtt_json_message(hass, mqtt_mock):
+    """Test the setting of attribute via MQTT with JSON payload."""
+    await help_test_setting_blocked_attribute_via_mqtt_json_message(
+        hass,
+        mqtt_mock,
+        alarm_control_panel.DOMAIN,
+        DEFAULT_CONFIG,
+        MQTT_ALARM_ATTRIBUTES_BLOCKED,
+    )
+
+
 async def test_setting_attribute_with_template(hass, mqtt_mock):
     """Test the setting of attribute via MQTT with JSON payload."""
     await help_test_setting_attribute_with_template(