Hi author, nice hacking and writeup!. Nordic employee here. Note that if instead of the SoftDevice and the SDK you would've used Zephyr then you'd be able to do

Hi author, nice hacking and writeup!. Nordic employee here. Note that if instead of the SoftDevice and the SDK you would've used Zephyr then you'd be able to do the same you did but with a fully open source software stack, including all layers of the BLE protocol stack. More here https://github.com/zephyrproject-rtos/zephyr https://github.com/zephyrproject-rtos/zephyr