readData()
Read and store the sensor data. This data can be accessed with getTVOC, geteCO2, getCurrentSelected and getRawADCreading. ccs.readData()ccs: a variable of type ZUNO_CCS811.
uint8_t - 0 if no error, error code otherwise
ccs: a variable of type ZUNO_CCS811.
uint8_t - 0 if no error, error code otherwise