feat: [UCR] Device functions

docs_src/design/TOC.md

@@ -7,9 +7,10 @@
 
 | Name/Link                                                                           | Short Description                                                   |
 |-------------------------------------------------------------------------------------|---------------------------------------------------------------------|
-| [Bring Your Own Vault](./ucr/Bring-Your-Own-Vault.md)                               | Use Case for bringing your own Vault |
+| [Bring Your Own Vault](./ucr/Bring-Your-Own-Vault.md)                               | Use Case for bringing your own Vault                                |
 | [Common Configuration](./ucr/Common Configuration.md)                               | Use Case for having Common configuration used by all EdgeX services |
 | [Core Data Retention and Persistent Cap](./ucr/Core-Data-Retention.md)              | Use Case for capping readings in Core Data                          |
+| [Device Functions](./ucr/Device-Functions.md)                                       | Use Case for Device Functions                                       |
 | [Device Parent-Child Relationships](./ucr/Device-Parent-Child-Relationships.md)     | Use Case for Device Parent-Child Relationships                      |
 | [Extending Device Data](./ucr/Extending-Device-Data.md)                             | Use Case for Extending of Device Data by Application Services       |
 | [Provision Watch via Device Metadata](./ucr/Provision-Watch-via-Device-Metadata.md) | Use Case for Provision Watching via Additional Device Metadata      |

docs_src/design/ucr/Device-Functions.md

@@ -0,0 +1,29 @@
+# Use Case Title
+Device Functions
+
+## Submitters
+Darryl Mocek (Oracle)
+
+## Changelog
+
+## Market Segments
+Any segments using EdgeX with device services with devices that support device functions.
+
+## Motivation
+Many devices contain functions that can be called, like the ability to reboot a device.  EdgeX currently does not support the ability to invoke device functions, making parts of devices inaccessible.
+
+## Target Users
+Any users using EdgeX with device services with devices that support device functions.
+
+## Description
+Some devices support functions, invoking some action on a device, similar to a function in software.  These functions unlock important functionality on the device.
+
+## Existing solutions
+EdgeX supports setting attributes on a device.  The workaround for calling device functions currently in EdgeX is to configure a device to call a function when setting at attribute, which isn't always feasible.  For example, to call a 'reboot' device function on a device, a 'reboot' attribute would have to be created and it would have to be set to a value to invoke the reboot function on the device.
+
+## Requirements
+Each Device should have a function resource and its parameters defined to support calling the device function with appropriate parameters.
+
+## Related Issues
+
+## References