Custom bluetooth agents

[haylocki]

Hi,
I have modified the example bluetooth agent code, and now I wish to use my modified agent rather than the default agent.
How do I do this?

The agent is located at /usr/local/bin/autoAgent
(I know it's not the proper place to put a python script ).

I have tried

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bluetoothctl -a /usr/local/bin/autoAgent

but this just gives me the following error:
Failed to register agent: org.bluez.Error.InvalidArguments

Cheers, Ian

[Douglas6]

No idea how (or if) you can get bluetoothctl to run your code. Why not just run it from the command line?

[haylocki]

Hi, thanks for the reply.

I thought that as you have the "default-agent" command in bluetoothctl, you could load your own agent.

I am trying to get my Pi to pair with and trust my Android phone automatically.

I have modified the agent thus:

Code: Select all

	def RequestConfirmation(self, device, passkey):
		#### my code
		set_trusted(device)
		return
		#### my code
		print("RequestConfirmation (%s, %06d)" % (device, passkey))
		confirm = ask("Confirm passkey (yes/no): ")
		if (confirm == "yes"):
			set_trusted(device)
			return
		raise Rejected("Passkey doesn't match")

def RequestAuthorization(self, device):
		#### my code
		return
		#### my code
		print("RequestAuthorization (%s)" % (device))
		auth = ask("Authorize? (yes/no): ")
		if (auth == "yes"):
			return
		raise Rejected("Pairing rejected")

Which I believed would remove the necessity for me to enter a pin, and trust the phone manually.
But if I run bluetoothctl and turn on the power, pairing, and discoverability.
Then exit bluetoothctl and run my modified agent.
Then try to pair on the phone I get an incorrect pin number error.

Cheers, Ian

[Douglas6]

I believe you'll need to modify requestPinCode() and/or requestPasskey(). Some dongles use one, some the other.

I have some code that (among other things) acts as a pairing agent and also makes the Pi discoverable: https://github.com/Douglas6/blueplayer/

[haylocki]

Sigh....

This used to be so easy.

I have removed my modifications from the agent.
Running the agent causes the terminal to display "Agent registered".

Trying to pair still fails with the pin / passkey error, but unlike the agent built into bluetoothctrl I don't get any messages on the terminal.

Now I would expect the same messages as when using the built in agent. So I'm wondering if my agent is really running, and how to check if it is.

Cheers. Ian

[Douglas6]

Not sure what to tell you. Make sure the devices are removed from both sides. When I try to connect from an Android phone, while running the BlueZ simple-agent, and trying to connect from the phone, I get an 'authorization yes/no' on the Pi. Answering 'yes' pairs the devices.

This on a Pi3.

[haylocki]

Hi, thanks for your help. I will try re-downloading the simple-agent script, and see what happens with that.

I do have some code that uses blutoothctl that I managed to get to pair automatically but still required me to trust manually. If all else fails I'll add the code to automatically trust devices.

Just seems like a lot of work for something so simple.......

[edit]

OK so I tried a fresh copy of simple-agent, and it worked as you said. Go figure.
Then I edited the agent and auto pairing and trusting worked!
I now need to figure out how to force the pairing to use the passcode / pin number option so I can change the code to bypass that check. Think I need to enable legacy pairing.

[edit 2]

Wow! That was easier than I expected.

Code: Select all

hciconfig hci0 sspmode 0

turns on legacy mode.
then I simply edit simple-agent to return whatever passcode I wish to use, rather than asking the user to input a value.

Cheers, Ian

[ibrahimuslu]

I am sorry but i can not find how to change default-agent with simple-agent

do i need to recompile bluez for this? (https://github.com/r10r/bluez/tree/master/test)

[Douglas6]

Simply run simple-agent. It will make itself the default.

[ibrahimuslu]

Thank you.
omg! it is only a python script.
I didnt think that it was simple as this.

While i running i faced with some problems, so for those who want to run this script i want to inform that

before running script dont forget to install PyBluez

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 pip install PyBluez 

and

dont forget to download also bluezutils.py to the where you are running simple-agent script

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 wget https://raw.githubusercontent.com/pauloborges/bluez/master/test/bluezutils.py

step by step guide how to use this script is here:
https://www.linuxquestions.org/question ... ost5149524

[Douglas6]

You don't need PyBluez to run simple-agent. You do need the bluez-utils.py module to run simple-agent and several other of the BlueZ test/ scripts, which are all in Python.