It is unsafe to issue a vendor-specific command and depend on the controller to reject the command if it does not understand it. Microsoft can't choose a command code and assume that no other vendor uses the code for a conflicting purpose. The vendor must choose the value of the Microsoft-defined command code. Vendors define values in the range 0xFC00 through 0xFFFF, allowing for 1024 different possible vendor-assigned command codes. The Bluetooth organization defines values in the range 0x0000 through 0xFBFF. Requirementsīluetooth HCI commands are identified by a 16-bit command code. Bluetooth controller implementers can use these extensions to implement special features. Microsoft defines vendor-specific HCI commands and events that are consumed by Windows. Bluetooth specifications allow vendor-defined HCI commands and events to enable non-standardized interaction between hosts and controllers. The Bluetooth Host-Controller Interface (HCI) specifies all interactions between a host and a Bluetooth radio controller.
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