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What about the following command?
$ ros2 topic pub /byte std_msgs/msg/Byte "{data: {3}}"
publisher: beginning loop
publishing #1: std_msgs.msg.Byte(data=b'\x03')
publishing #2: std_msgs.msg.Byte(data=b'\x03')
publishing #3: std_msgs.msg.Byte(data=b'\x03')
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