Add mqtt encoding support for publishing (#62739)

* encoding support for mqtt publishing - todo tests

* signature allows None values for qos and retain

* common test for mqtt publishing encoding

* better test with command templates

* more tests

* fix tests alarm control panel+tests light basic

* tests light json and template

* add tests vacuum and fix tests light_template

tests/components/mqtt/test_select.py

@@ -33,6 +33,7 @@ from .test_common import (
     help_test_entity_device_info_with_identifier,
     help_test_entity_id_update_discovery_update,
     help_test_entity_id_update_subscriptions,
+    help_test_publishing_with_custom_encoding,
     help_test_setting_attribute_via_mqtt_json_message,
     help_test_setting_attribute_with_template,
     help_test_setting_blocked_attribute_via_mqtt_json_message,
@@ -524,3 +525,37 @@ async def test_mqtt_payload_not_an_option_warning(hass, caplog, mqtt_mock):
         "Invalid option for select.test_select: 'öl' (valid options: ['milk', 'beer'])"
         in caplog.text
     )
+
+
+@pytest.mark.parametrize(
+    "service,topic,parameters,payload,template",
+    [
+        (
+            select.SERVICE_SELECT_OPTION,
+            "command_topic",
+            {"option": "beer"},
+            "beer",
+            "command_template",
+        ),
+    ],
+)
+async def test_publishing_with_custom_encoding(
+    hass, mqtt_mock, caplog, service, topic, parameters, payload, template
+):
+    """Test publishing MQTT payload with different encoding."""
+    domain = select.DOMAIN
+    config = DEFAULT_CONFIG[domain]
+    config["options"] = ["milk", "beer"]
+
+    await help_test_publishing_with_custom_encoding(
+        hass,
+        mqtt_mock,
+        caplog,
+        domain,
+        config,
+        service,
+        topic,
+        parameters,
+        payload,
+        template,
+    )