Hello dbakush,
The docs are mostly for the mobile environments, but it does have the Bluetooth protocol info in the downloads docs. Have you downloaded and seen them? Does it help?
https://developer.bosch.com/products-and-services/sdks/bosch-glm-plr-app-kit/downloads
I'm not sure if you have an older version of the device, but according to these docs the latest is BLE 4.2 :
https://www.bosch-professional.com/gb/en/products/glm-50-27-cg-0601072U00
If you're looking for more support, dependent on your country, maybe you can try the general or even mobile app support for other options:
https://www.bosch-professional.com/gb/en/service/after-sales-service/additional-services/contact/
https://play.google.com/store/apps/details?id=com.bosch.ptmt.measrOn
Thank you
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