Add unique_id to modbus entities (#21332)

source/_integrations/modbus.markdown

@@ -265,6 +265,10 @@ slave:
   required: false
   type: integer
   default: 0
+unique_id:
+  description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+  required: false
+  type: string
 {% endconfiguration %}
 
 ### Configuring data_type and struct
@@ -314,6 +318,10 @@ swap:
   required: false
   default: none
   type: string
+unique_id:
+  description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+  required: false
+  type: string
 {% endconfiguration %}
 
 ## Configuring platform binary sensor
@@ -358,6 +366,10 @@ binary_sensors:
       required: false
       default: coil
       type: string
+    unique_id:
+      description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+      required: false
+      type: string
 {% endconfiguration %}
 
 ## Configuring platform climate
@@ -435,6 +447,10 @@ climates:
       required: false
       type: string
       default: C
+    unique_id:
+      description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+      required: false
+      type: string
 {% endconfiguration %}
 
 ### Service `modbus.set-temperature`
@@ -526,6 +542,10 @@ covers:
       description: Modbus register type (holding, input), default holding.
       required: false
       type: string
+    unique_id:
+      description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+      required: false
+      type: string
 {% endconfiguration %}
 
 ### Example: Modbus cover controlled by a coil
@@ -713,6 +733,10 @@ fans:
           required: false
           default: same as command_off
           type: integer
+    unique_id:
+      description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+      required: false
+      type: string
 {% endconfiguration %}
 
 ## Configuring platform light
@@ -802,6 +826,10 @@ lights:
           required: false
           default: same as command_off
           type: integer
+    unique_id:
+      description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+      required: false
+      type: string
 {% endconfiguration %}
 
 ## Configuring platform sensor
@@ -882,6 +910,10 @@ sensors:
       description: The [state_class](https://developers.home-assistant.io/docs/core/entity/sensor#available-state-classes) of the sensor.
       required: false
       type: string
+    unique_id:
+      description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+      required: false
+      type: string
 {% endconfiguration %}
 
 <div class='note'>
@@ -1001,6 +1033,10 @@ switches:
           required: false
           default: same as command_off
           type: integer
+        unique_id:
+          description: An ID that uniquely identifies this sensor. If two sensors have the same unique ID, Home Assistant will raise an exception.
+          required: false
+          type: string
 {% endconfiguration %}
 
 ## Opening an issue