Hi manojCH,
You can download BSEC package from https://www.bosch-sensortec.com/software-tools/software/bme688-software, latest version is BSEC 2.4.0.0. After your download, you will find integration guide under the package.
Currently BSEC library haven't support PIC32 platform, but if you would like to design a project, you can provide your email address, we will contact with you.
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