The XDK is device sold by a separate Bosch division : Bosch Connected Devices and Solutions. They do use Bosch Sensortec sensors in their modules, along with components from other vendors to make a complete system. The XDK is supported in a different community : http://xdk.bosch-connectivity.com/community
The BME280 gives an accurate measurement of the air inside of its package. The overall mechanical design, airflow and nearby heat sources will impac the data. This integration is done by our customers. With that in mind, I would recommmend that you seek support directly from BCDS regarding their inputs on this, since they made this integration for the XDK.
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