I use a Wemos D1 ESP8266 Board with a BME680 connected to I2C , BSEC libary installed and adjustments done as decribed in the Github pages (https://github.com/BoschSensortec/BSEC-Arduino-library) and using the "basic" example from there. Temp., humidity, pressure look OK, but all other values do not change since 9 days (IAC =25, Accuracy=0, CO2 = 500, VOC = 0.5).
Edit: Gas resitance changes, esp. when I breath on it, so Iassume the sensor works, but caclulation of the values not.
I've tested three versions of the BSEC library, but no change (1.2.1474, 1.4.703, 126.96.36.199).
I'm using Arduino IDE 1.8.13, includes are: bsec.h (as per example provided)