feat(sensor): Available typed-input for sensor and binary_sensor

docs/node/binary-sensor.md

@@ -17,6 +17,15 @@ The state of the entity should be updated to
 
 To set the Home Assistant state to `Unknown`, send a state with a js expression `null`.
 
+### Available
+
+- Type: `boolean`
+- Default: `true`
+
+Whether the Home Assistant entity is available. By default, every update sends available as true. On creation, or after a Home Assistant restart without Resend, the entity starts unavailable until availability is set again.
+
+If availability comes from a message, flow, global, or expression, and that value is missing, it is not sent and Home Assistant leaves availability unchanged. In that case, set availability again after a Home Assistant or Node-RED restart or the entity will remain unavailable.
+
 ### Attributes
 
 - Type: `Object`
@@ -30,6 +39,12 @@ Key/Value pair of attributes to update. The key should be a string and the value
 
 Determine how input values will be handled. When merge is selected the message object values will override the configuration values.
 
+## Partial updates
+
+State, available, and the attribute map are updated independently. Home Assistant keeps the last value for anything omitted.
+
+For example, you can send a new state without changing attributes, flip availability without a state, or update the attribute map alone. A message that resolves nothing for all three parts is ignored (no update is sent).
+
 ## Inputs
 
 properties of `msg.payload`
@@ -40,6 +55,12 @@ properties of `msg.payload`
 
 The value of the entity state will be updated.
 
+### available
+
+- Type: `boolean`
+
+Optional. Sets entity availability for this update. Omit to leave availability unchanged.
+
 ### attributes
 
 - Type: `Object`

docs/node/entity-config.md

@@ -26,11 +26,11 @@ If the entity has already been registered with Home Assistant when no device was
 - Type: `string`
 - Values: `binary_sensor|button|sensor|switch`
 
-### Resend state and attributes
+### Resend state, attributes, and available
 
 - Type: `boolean`
 
-When the entity in Home Assistant is created the state and attributes will also be set. This is only applicable with certain entities nodes.
+When the entity in Home Assistant is created the last state, attributes, and available value will also be set. This is only applicable with certain entity nodes.
 
 ### Other Properties
 

docs/node/entity.md

@@ -56,11 +56,11 @@ Key/Value pair of attributes to update. The key should be a string and the value
 
 Determine how input values will be handled. When merge is selected the message object values will override the configuration values.
 
-### Resend state and attributes
+### Resend state, attributes, and available
 
 - Type: `boolean`
 
-When creating the entity in Home Assistant this will also send the last updated state and attributes then node sent to Home Assistant
+When creating the entity in Home Assistant this will also send the last updated state, attributes, and available value the node sent to Home Assistant
 
 ## Switch Configuration
 

docs/node/sensor.md

@@ -17,6 +17,15 @@ The state the entity should be updated to
 
 To set the Home Assistant state to `Unknown`, send a state with a js expression `null`.
 
+### Available
+
+- Type: `boolean`
+- Default: `true`
+
+Whether the Home Assistant entity is available. By default, every update sends available as true. On creation, or after a Home Assistant restart without Resend, the entity starts unavailable until availability is set again.
+
+If availability comes from a message, flow, global, or expression, and that value is missing, it is not sent and Home Assistant leaves availability unchanged. In that case, set availability again after a Home Assistant or Node-RED restart or the entity will remain unavailable.
+
 ### Attributes
 
 - Type: `Object`
@@ -30,11 +39,17 @@ Key/Value pair of attributes to update. The key should be a string and the value
 
 Determine how input values will be handled. When merge is selected the message object values will override the configuration values.
 
-### Resend state and attributes
+### Resend state, attributes, and available
 
 - Type: `boolean`
 
-When creating the entity in Home Assistant this will also send the last updated state and attributes then node sent to Home Assistant
+When creating the entity in Home Assistant this will also send the last updated state, attributes, and available value the node sent to Home Assistant
+
+## Partial updates
+
+State, available, and the attribute map are updated independently. Home Assistant keeps the last value for anything omitted.
+
+For example, you can send a new state without changing attributes, flip availability without a state, or update the attribute map alone. A message that resolves nothing for all three parts is ignored (no update is sent).
 
 ## Inputs
 
@@ -46,6 +61,12 @@ properties of `msg.payload`
 
 The state the entity should be updated to
 
+### available
+
+- Type: `boolean`
+
+Optional. Sets entity availability for this update. Omit to leave availability unchanged.
+
 ### attributes
 
 - Type: `Object`