Bug report

Required Info:

• Operating System:
  • Ubuntu 20.04
• Installation type:
  • binaries
• Version or commit hash:
  • ros2cli 0.13.4
• DDS implementation:
  • rmw_cyclonedds_cpp: 0.22.5
• Client library (if applicable):
  • N/A

Steps to reproduce issue

Trying to ros2 topic pub a std_msgs/msg/ByteMultiArray message. I have tried:

bash ros2 topic pub -1 /whatever std_msgs/msg/ByteMultiArray "{data: [{3}, {4}]}"

and

bash ros2 topic pub -1 /whatever std_msgs/msg/ByteMultiArray "{data: [0x03, 0x04]}" 

Expected behavior

Successful publishing.

Actual behavior

Error response:

Failed to populate field: The 'data' field must be a set or sequence and each value of type 'bytes'

Additional information

• Related ROS Answer: https://answers.ros.org/question/406242/how-is-a-std_msgsmsgbytemultiarray-message-published-via-cli/