Automated sensor test on setup

**Issue:**
How do we know that the sensor we received from the manufacturer is functional and our device setup steps (loading the firmware?) were correctly done.

**Proposal:**
Create an automate suite of tests that can be run when we set up sensors to check it can successfully connect to the wifi, make and send a measurement. At the end of testing, the sensor resets to its clean-slate status, ready to be shipped.

@tcsullivan @gabesawhney do we see the need for this?