[andoma]

Yup, Rolled my own BLE Peripheral stack on NRF52 relying on nothing but Nordic's docs and the BLE specification. It's not fully feature complete but works well enough for me to communicate with the mcu from my MacBook using l2cap connections.

[BertoldVdb]

The people in these talks go quite a bit further than just BLE packet TX/RX (which you can do with the documentation on most chips). In theory this work allows implementing a totally different protocol.

[DannyBee]

Nordic supports this explicitly I thought. (Others I agree but they often have crappy stuff anyway)