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From:   Mihai Emilian <be.mihai22@gmail.com>
Date:   Tue, 2 Mar 2021 18:07:30 +0100
Message-ID: <CAP_L5iPNbYrni-U_EH=Yf5Tb3b7tGN6wFKp-h+HNE8ob028k5w@mail.gmail.com>
Subject: Autopairing
To:     linux-bluetooth@vger.kernel.org
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Dear bluetooth community,

I am trying to create a pairing agent using bluez API in C.

The problem that I am trying to solve is autopairing from a known list
of MAC addresses (i.e auto-accept pairing for known devices in the
list).

I tried registering a bluetooth agent with NoInputNoOutput capability.
However, when I try to access Pair, I receive Authentication Failed
error.

Another problem here is that even if I call RequestDefaultAgent after
registration, it seems that the bluetooth settings agent (UI) is still
called and prompts me to yes/no.

I have the following questions:

From the api doc:
"Special permission might be required to become the default agent"

- Is there anything else I have to do to acquire these permissions?
- The return value from RequestDefaultAgent and RegisterAgent is void.
How can I check whether my agent has been registered/became default?
- I also tried trusting the discovered device after registering the
agent and trying to make it default, which didn't make any difference
- is this required?

Here's my source code:
https://pastebin.com/Wj3rdHy3

Thank you for your time.

Best regards,
Mihai