Support config.protocol.options which defines which part of protocol definition should be generated.

sample_config.json

 {
     "protocol": {
         "path": "./relative/path/protocol/sample_protocol.json",
         "package": "include/generated/files/like/this",
         "output": "place/generated/files/here",
         "namespace": ["sample_project", "protocol"],
         "export_macro": "LIB_EXPORT",
-        "export_header": "lib/lib_export.h"
+        "export_header": "lib/lib_export.h",
+        "options": [
+            {
+                "domain": "Domain1",
+                "include": ["command1", "command2"],
+                "async": ["command1"]
+            },
+            {
+                "domain": "Domain2",
+                "exclude": ["command3", "command4"],
+                "exclude_events": ["event1"],
+                "async": ["command10"]
+            },
+            {
+                "domain": "Domain3"
+            }
+        ],
     },
 
     "exported": {
         "package": "include/exported/files/like/this",
         "output": "place/exported/files/here",
         "string_header": "include/exported/string.h",
         "string_in": "String",
         "string_out": "String",
         "to_string_out": "toString(%s)",
         "export_macro": "LIB_EXPORT",
@@ skipping 11 matching lines @@
 
     "lib": {
         "package": "include/lib/files/like/this",
         "output": "place/generated/lib/files/here",
         "string_header": "string/implementation.h",
         "platform_header": "platform/implementation.h",
         "export_macro": "LIB_EXPORT",
         "export_header": "lib/lib_export.h"
     }
 }