How can I use the console for input of pin code instead of the window "/usr/bin/bluez-pin"?

Hi,

when we use "hcitool cc [mac]",
a windows "/usr/bin/bluez-pin" pops up , and requires us to input pin code
for paring.

Now I want to use console for input of pin code, because I want to use it in
embedded system which has no GUI.

So I debugged the code to find out which sentence pops up
/usr/bin/bluez-pin.
It turned out to be this sentence in bluez-lib-3.30:

hci.c

int hci_send_cmd(int dd, uint16_t ogf, uint16_t ocf, uint8_t plen, void
*param)
{
  .........

  /*****************************here pops up
/usr/bin/bluez-pin***********************************************/
    while (writev(dd, iv, ivn) < 0) {
        if (errno == EAGAIN || errno == EINTR)
            continue;
        return -1;
    }
    return 0;
}


I don't know why it is this sentence that pops up /usr/bin/bluez-pin.
Can anyone tell me the reason?
And how should I change source codes so that I can use the console for input
of pin code?

Thanks!

Proteus

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