// bthddi.h

typedef struct _CO_HEADER {
  CO_TYPE   Type;
  CO_LENGTH Length;
} CO_HEADER;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-bthddi-_co_header)

The CO_HEADER structure is used to specify values for the Header member of the L2CAP_CONFIG_OPTION structure.

The type of the vendor-specific option stored in the L2CAP_CONFIG_OPTION structure. This can accept either an option or a hint.

The size, in bytes, of the vendor-specific option stored in the L2CAP_CONFIG_OPTION structure.