Issue comes from the set during the tests...

kptdobe · kptdobe · commit a2a9896b0195 · 2018-08-15T11:11:11.000+02:00
diff --git a/src/FirebaseArduino.cpp b/src/FirebaseArduino.cpp
@@ -179,9 +179,7 @@ FirebaseObject FirebaseArduino::readEvent() {
   String event = client->readStringUntil('\n').substring(6);
   client->readStringUntil('\n'); // consume separator
   FirebaseObject obj = FirebaseObject(event.c_str());
-  JsonVariant v = obj.getJsonVariant();
-  JsonObject& jsonObj = v.as<JsonObject&>();
-  jsonObj.set("type", type);
+  obj.getJsonVariant().asObject().set("type", type);
   return obj;
 }
 
