Custom UART Bootloader for nRF52805

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I am using s112_nrf52_7.2.0_softdevice with nRF5_SDK_17.1.0 and Segger Embedded studio for nRF52805. 

My application code uses 150 kb Flash(Out 192 kb). I want to develop a custom Bootloader for nRF52805 so that  Host Microcontroller can update its firmware using UART(Rx ,Tx Pin) interface.

Means host microcontroller have bin/hex file and will send ,that hex file data into packet format (in some protocol or integrity checking mechanism) to nrf52805 for firmware upgradation without any security.

Kindly help me out with necessary steps to be done for developing custom UART bootloader and example if any.

Thanks  

[Hung Bui]

Hi Suresh, 
The example is pretty simple. I think you can simply use the main.c file and make a new project in Segger Embedded Studio to use it.