Allows the discovery of the L2CAP PSM assigned to the service.
- macOS 10.2+
A pointer to the location that will get the found L2CAP PSM.
Returns kIOReturnSuccess if the PSM is found.
This method will search through the ProtoclDescriptorList attribute to find an entry with the L2CAP UUID (UUID16: 0x0100). If one is found, it gets the second element of the data element sequence and sets the outPSM pointer to it. The PSM value only gets set when kIOReturnSuccess is returned.