Can you please clarify the question? Do you want L2CAP level API's. The IPSP is designed such a way that the stack directlt talks to L2CAP layer. Is that what you are looking for?
We are developing Android and Linux endpoints in Java and Python that will receive the data sent by the L2CAP stream. We have not found any APIs that are able to act as receiving endpoints for the L2CAP. I just want to be able to connect to the PSoC4BLE device from Linux and/or Android and receive the L2CAP messages just like the CySmart receives them. SO, I am not sure if I am answering your question? The PSoC side is all working to CySmart.