Thanks! There is now a button to turn the cooler on and off in Ekos. With the SDK, the cooler seems to be turned on by default, excellent. This code:
if (camera->getCoolingStatus(&state, &temp, &power) == false) { fprintf(stderr, "failed to get cooling status\n"); }
Assertion "tempSensorType!=0" failed (/home/polakovic/indi-atik/atikccdusb.cpp, 223)