update upstream-2021-08-15

PROTOCOL

@@ -429,7 +429,28 @@ Added two values to the pa_encoding_t enum:
 
 ## v34, implemented by >= 14.0
 
-Added available_group and type fields to the device port info.
+New fields in the port introspection data (duplicated for all port types:
+sink, source and card ports):
+
+    string availability_group
+    uint32 type
+
+## v35, implemented by >= 15.0
+
+Added new command for communication with objects.
+
+PA_COMMAND_SEND_OBJECT_MESSAGE:
+sends a message to an object identified by an object path
+
+parameters:
+    string object_path - unique path identifying the object
+    string message - message name
+    string message_parameters - additional parameters if required (may be
+                                NULL, which should be treated the same as an
+                                empty string)
+
+The command returns a string, which may be empty or NULL (NULL should be
+treated the same as an empty string).
 
 #### If you just changed the protocol, read this
 ## module-tunnel depends on the sink/source/sink-input/source-input protocol