Exposed function not showing up on Photon

Cloud
7

The problem may be that

void setup() {
  waitFor(Time.isValid, 600000); // wait up to 10 minutes for Wi-Fi router to come back online after power failure
 ...
  Particle.function("getRSSI", getRSSI);
  Particle.variable("gallonsDown", gallonsDown);
  Particle.variable("values", valuesString);
}

You should put that Particle.function() / Particle.variable() (and for the same reason Particle.subscribe()) block to the top of setup().

If the waitFor() (or anything else) takes more than 5sec after cloud connection you might miss the registration window after connect.

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