Mqtt configurable state encoding for sensor and binary_sensor platform (#20469)

source/_docs/mqtt/discovery.markdown

@@ -119,6 +119,7 @@ Supported abbreviations:
     'dev_cla':             'device_class',
     'dock_t':              'docked_topic',
     'dock_tpl':            'docked_template',
+    'e':                   'encoding',
     'err_t':               'error_topic',
     'err_tpl':             'error_template',
     'fanspd_t':            'fan_speed_topic',

source/_integrations/binary_sensor.mqtt.markdown

@@ -109,6 +109,11 @@ enabled_by_default:
   required: false
   type: boolean
   default: true
+encoding:
+  description: The encoding of the payload received at `state_topic`. Set to `""` to disable decoding.
+  required: false
+  type: string
+  default: "utf-8"
 entity_category:
   description: The [category](https://developers.home-assistant.io/docs/core/entity#generic-properties) of the entity.
   required: false

source/_integrations/sensor.mqtt.markdown

@@ -101,6 +101,11 @@ enabled_by_default:
   required: false
   type: boolean
   default: true
+encoding:
+  description: The encoding of the payload received at `state_topic`. Set to `""` to disable decoding.
+  required: false
+  type: string
+  default: "utf-8"
 entity_category:
   description: The [category](https://developers.home-assistant.io/docs/core/entity#generic-properties) of the entity.
   required: false