I am having trouble publishing messages with sequences in them, such as example_interfaces/UInt8MultiArray. By default, the expression is populated with array('B'). When I try to populate with data, such as array('B', [1]) I get errors in the terminal.

[ERROR] [1611709217.176271581] [getmessageclass]: Malformed messagetype: sequence Python eval failed for expression "array('d',[1])" with an exception "name 'array' is not defined" Publisher.evaluateexpression(): failed to evaluate expression: "array('d',[1])" as Python type "None" Traceback (most recent call last): File "/opt/ros/foxy/lib/python3.8/site-packages/rqtpublisher/publisher.py", line 157, in changepublisher newtext = handler(self.publishers[publisherid], topicname, newvalue) File "/opt/ros/foxy/lib/python3.8/site-packages/rqtpublisher/publisher.py", line 258, in _changepublisherexpression expression, errorprefix, slottype.name) AttributeError: 'NoneType' object has no attribute 'name_'

Can someone provide an example of proper usage for the expression field?

Thanks!