fix: syntax error

Author: sasilva1998

src/uros/core.py

@@ -97,7 +97,7 @@ def _advertise_topic(self, topic_name, _id, msg, endpoint, buffer_size):
         self.uart.write(bytearray(fpacket))
 
     def _advertise_all_topics(self):
-        for key, value in self.advertised_topics:
+        for key, value in self.advertised_topics.items():
             self._advertise_topic(key, value[0], value[1], value[2], value[3])
 
     def publish(self, topic_name, msg, buffer_size=1024):