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−For example, to reset the Bluetooth HCI (and therefore break the connection with the [[Wiimote]]), send a message with the parameters (0x20,0,0,0,0x0300,0) and data 03 0C 00. (0x0300 is the length, 3, in little-endian format).
+For example, to reset the Bluetooth HCI (and therefore break the connection with the [[Wiimote]]), send a message with the parameters (0x20,0,0,0,0x0300,0) and data 03 0C 00. (0x0300 is the length, 3, in little-endian format). The operation returns the number of bytes read or written.
+=== Send Or Receive Bulk/Interrupt Message ===
+ ioctlv(fd, '''1''', 2, 1, vectors); //Bulk
+ ioctlv(fd, '''2''', 2, 1, vectors); //Interrupt
+Vectors:
+{| style="border-collapse: collapse; padding: 0.2em 0.2em 0.2em 0.2em;"
+|- style="background-color: #ddd;"
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #eee;" | '''I/IO'''
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ded;" | '''Number'''
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #dde;" | '''Type'''
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ddd;" | '''Length'''
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #edd;" | '''Description'''
+|- style="background-color: #ddd;"
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #eee;" | I
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ded;" | 0
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #dde;" | u8
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ddd;" | 1
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #edd;" | bEndpoint
+|- style="background-color: #ddd;"
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #eee;" | I
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ded;" | 1
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #dde;" | u16
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ddd;" | w
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #edd;" | wLength
+|- style="background-color: #ddd;"
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #eee;" | IO
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ded;" | 2
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #dde;" | array
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #ddd;" | wLength
+| style="border: 1px solid #ccc; padding: 0.2em; background-color: #edd;" | request data payload
+|}
+The same request is used for both sending and receiving data. Which operation is used depends on the endpoint number (>=0x80 are input endpoints, <0x80 are output). The operation returns the number of bytes read or written.