Hard Fault following System.sleep()

Troubleshooting
11

One thing you should do is to put a five second wait between your publish and the sleep statement.
I’d do this

  for(uint32_t ms=millis(); millis() - ms < 5000; Particle.process());

Other than that I’d have to plough through your whole code to see more, but that’d take time.
When do you get the solid cyan? (on sleep or on wake)

I wouldn’t do this either

  float pH;
  Particle.variable("pHVar", String(pH));

Rather make pH a double and expose that as Particle.variable() - you can always typecast wherever you need it to be a float, but not with Particle.variable().

You might also want to add some sanity check to your serialEvent() handlers, since readStringUntil() might actually timeout and then you won’t have a complete string.

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