upgrade onvif library

docs/Development.md

@@ -0,0 +1,34 @@
+# Development
+
+## Onvif Command Support
+Each of the following Onvif Web services has its own directory:
+- [Analytics](../analytics)
+- [Device](../device)
+- [Event](../event)
+- [Imaging](../imaging)
+- [Media](../media)
+- [Media2](../media2)
+- [PTZ](../ptz)
+
+Inside each directory there is:
+- `types.go`: contains the struct definitions for each onvif command and response
+- `function.go`: contains the auto-generated types that implement the `Function` interface providing `Request()` and `Response()` type mappings.
+
+At the root level there is:
+- [names.go](../names.go): contains the auto-generated constant names of all the commands
+- [mappings.go](../mappings.go): contains the auto-generated mappings for each Onvif WebService from function name to function datatype
+
+
+### Adding support for additional commands
+> **Note:** Currently, the python script looks for types that end with `Response` and work backwards from there.
+> This is to prevent creating commands for every struct type defined there, and only the ones that are actually commands.
+> It also skips any types ending with `FaultResponse`, as there typically are no `Fault` commands, only responses.
+
+For the respective web service the command belongs to, add the command and response struct definitions
+into `<web-service-name>/types.go`, and then run:
+```shell
+python3 python/gen_commands.py
+```
+
+> **Note:** You can also typically run the generator within your IDE thanks to the `//go:generate` lines 
+> towards the top of the `types.go` files.