Send data message to topic

[LucasHild]

I am trying to send a data message to the subscribers of a topic. This is my code:

result = push_service.multiple_devices_data_message(condition="'mytopic' in topics", data_message=data)

I get this error:

File "/.../venv/lib/python3.5/site-packages/pyfcm/fcm.py", line 305, in multiple_devices_data_message for registration_ids in registration_id_chunks:
File "/.../venv/lib/python3.5/site-packages/pyfcm/baseapi.py", line 65, in registration_id_chunks for i in xrange(0, len(registration_ids), self.FCM_MAX_RECIPIENTS):
TypeError: object of type 'NoneType' has no len()

How can I send a data message to a topic with this method?

[olucurious]

You should use notify_topic_subscribers

result = push_service.notify_topic_subscribers(topic_name="news", data_message = data)