b1ff2c6a8e
Rebreathers typically support multiple ppO2 sensors as a safety measure in case a sensor fails during the dive. The current api can already report multiple ppO2 values per sample, but it does not provide any information about which sensor the measurement is from. The new sensor index provides this info, and can also be used to distinguish between the average/voted ppO2 value using the special value DC_SENSOR_NONE.