Hi ZEPL,
Thanks for your inquiry. I provided an example of BSEC running on STM32F4, which supports outputting IAQ and enables macro definitions in the attachment code user_define.h file: #define BME68X_OUTPUT_GAS_IAQ The reference code is based on BSEC2.4.0.0, and you can download the package for BSEC2.4.0.0 from the official website https://www.bosch-sensortec.com/software-tools/software/previous-bsec-software-versions
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