> Apple, like every other vendor, does not have a choice but to implement this as a proprietary characteristic. Pre-BLE, other vendors copied Apple's de-facto `HFP
They could publish the details, and not block other manufacturer details, so that it is easier for other platforms to develop drivers for them. Or develop a new standard that works for their earbuds.
They could publish the details, and not block other manufacturer details, so that it is easier for other platforms to develop drivers for them. Or develop a new standard that works for their earbuds.