Hi Ajay_0107,
As you would like to get IAQ value in your project, you can download latest BSEC2.4.0.0 package from https://www.bosch-sensortec.com/software-tools/software/bme688-software, and refer the example code "BSEC2.4.0.0_Generic_Release_23012023\examples\BSEC_Integration_Examples\examples\bsec_iot_example\bsec_iot_example.c" and integration guide under "BSEC2.4.0.0_Generic_Release_23012023\integration_guide" folder.
I also upload example code which run on STM32 for your reference, hope it will be helpful for you. Enable the following macro definition in user_define.h.
#if defined(USE_BME68X) //#define BME68X_OUTPUT_GAS_ESTIMATE #define BME68X_OUTPUT_GAS_IAQ #endif
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