03_slow_consumer.py example produces Header with floating-point time fields

[WasabiFan]

Context: #57 (comment)

This example produces a floating-point nsecs value, rather than integer.

Expected Result

The message to publish without error.

Actual Result

Error message (from what I assume is the rosbridge):

[ERROR] [1599032244.517260]: [Client 0] [id: publish:/serial/turret_aim_feedback:161] publish: <class 'struct.error'>: 'required argument is not an integer' when writing 'header

Reproduction Steps

Above sample should do it.

System Information

Ubuntu 20.04; ROS noetic.