diff --git a/protocol.py b/protocol.py
new file mode 100644
index 000000000..038a0a840
--- /dev/null
+++ b/protocol.py
@@ -0,0 +1,7 @@
+
+class BinaryEventTypes:
+    PREVIEW_IMAGE = 1
+    UNENCODED_PREVIEW_IMAGE = 2
+    TEXT = 3
+    PREVIEW_IMAGE_WITH_METADATA = 4
+