hci_inquiry timeout is wrong

[jana_hus]

I have an issue with my usage of hci_inquiry function. When no devices are detected ,that is another issue I have but I need to fix this one first, it does not timeout as expected by "len" parameter value. The "elapsed time " is random , most of the time around 7s. When devices are actually detected the "elapsed time" is pretty much as expected, the function does work. I realize when no devices are detected is more important than how long it took to run, but I feel it should follow the "len" parameter. Would appreciate help or suggestion what else I can do to verify the function(s) time/ timeout when no devices are detected, Thanks

len = 16; // 1.28 * len seconds timer max_rsp = 255;
flags = IREQ_CACHE_FLUSH; //always real scan
ii = (inquiry_info*)malloc(max_rsp * sizeof(inquiry_info));
QET->start(); // debug restart timer

    num\_rsp = hci\_inquiry(dev\_id, len, max\_rsp, NULL, &ii, flags);

    text = "\\nTASK  elapsed time...\\n ";
    text += "num\_rsp = hci\_inquiry(d....";
    //text += Q\_FUNC\_INFO;
    text += "  @ line  ";
    text += QString::number(\_\_LINE\_\_);
    text += "\\nElapsed time \\t";
    text += QString::number(QET->elapsed());
    text += " mS ";
    m\_ui->textEdit\_29->append(text);
    qDebug().noquote() << text;
    text = "\\nnum\_rsp = hci\_inquiry(dev\_id, len, max\_rsp, NULL, &ii, flags) \\t";
    text += QString::number(num\_rsp);
    m\_ui->textEdit\_29->append(text);
    qDebug().noquote() << text;

[k5054]

According to [this:](https://people.csail.mit.edu/albert/bluez-intro/c404.html#:~:text=The inquiry lasts for at most 1.28 \* len seconds) the timeout is at most len * 1.28 seconds. Since you've got a value of 16 for ii, then you can expect hci_inquiry() to take no more than 20.48 seconds. Since ~7 < 20.48, it looks to me that hci_inquiry is working as advertised.

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