BulkTransfer
ssize_t BulkTransfer(void *data,
ret = bulk_in->BulkTransfer(data3, MAX_BUFFER_SIZE);
ret = bulk_in->BulkTransfer(&frame[offset], MAX_BUFFER_SIZE);
len = fBulkIn->BulkTransfer(fBuffer, fBufferLen);
return fOut->BulkTransfer((void*)buf, size);
return fIn->BulkTransfer(buf, size);