new try

server.py

@@ -43,9 +43,7 @@ def hello():
         shell=True,
     ).stdout.decode("utf-8")
     print(result)
-    # if result != "Characteristic value was written successfully":
-    #     raise Exception("Didn't work")
-    # else:
-    #     return request.query_string
-    # except print(0):
-    #     pass
+    if "Characteristic value was written successfully" not in result:
+        raise Exception("Didn't work")
+    else:
+        return request.query_string