How I get the passkey value??

RE: How I get the passkey value??

chosseang — Mon, 18 Nov 2024 01:06:50 GMT

Thank you for your answer.

RE: How I get the passkey value??

Kenneth — Fri, 15 Nov 2024 12:05:35 GMT

Hi,

You can for instance check out BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part H

Under chapter LE legacy pairing - Passkey Entry

"If the IO capabilities of a device are DisplayOnly or if Table 2.8 defines that the
device displays the passkey, then that device shall display a randomly
generated passkey value between 000,000 and 999,999. The display shall
ensure that all 6 digits are displayed – including zeros. The other device shall
allow the user to input a value between 000,000 and 999,999."

Kenneth

RE: How I get the passkey value??

chosseang — Fri, 15 Nov 2024 03:15:01 GMT

Oh.

Thank you the answer, Kenneth.

I understand your answer.

It is related to terms of security.

I'd like to see the official document of bluetooth and android on the passkey 6-digit limit, is it possible??

RE: How I get the passkey value??

Kenneth — Thu, 14 Nov 2024 17:39:29 GMT

Hello,

I am not sure this request is possible.

The passkey is either generated during BLE pairing by the device that have a display device, or it must be specified prior to BLE pairing as a static passkey by the device that claim it has a display. The passkey must be 6 digit long. It's not transferred in clear text in any way, though I guess it's possible to also write the 6 digit value to a characteristic, which the peer device can read during connection before pairing, but it's a odd implementation, and in terms of security I don't see this as a good solution.

Kenneth