Hi Dileep, I hope you're doing well!
I'm sorry for the inconveniences this may cause, but a purely bare-metal implementation of a BLE Application is not possible, this is due to the deadlines for data transmission that the Bluetooth SIG state in their Core Specification. To comply with these task deadlines, some kind of RTOS is necessary, that's why the "baremetal" implementation of our examples use an OS Abstraction Layer.
We have some video trainings and tutorials on how to create BLE applications by using our SDKs, APIs and MCUs. These video trainings can be found in the following link.
There's also some documentation included with the SDK you choose to work with. For example, the KW36Z's SDK has some related documents, like the Bluetooth Low Energy Application Developer's Guide, in the following path:
<…\SDK_2.2.1_FRDM-KW36\docs\wireless\Bluetooth>
Please let me know if you need more information.
Best regards,
Sebastian