Convert UUID objects to strings when serializing to JSON.

platypush/message/__init__.py

@@ -7,6 +7,7 @@ import inspect
 import json
 import time
 from typing import Union
+from uuid import UUID
 
 logger = logging.getLogger('platypush')
 
@@ -60,6 +61,9 @@ class Message:
             if isinstance(obj, set):
                 return list(obj)
 
+            if isinstance(obj, UUID):
+                return str(obj)
+
             value = self.parse_numpy(obj)
             if value is not None:
                 return value