Measure round-trip communication delay

[bsutherland333]

To better understand the kind of performance we can expect to get out of our serial communication, we want to measure the rate and consistency of our round-trip serial communication.

• [ ] Design test setup
• [ ] Build test setup
• [ ] Perform tests, characterizing delay and consistency

[JMoore5353]

How long does it take to go from sensor measurement to actuator output?

[JMoore5353]

This will be important to know if we can send motor commands to the firmware from ROScopter, in PASS_THROUGH mode.