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The /var/lib/bluetooth/<dongle addr>/linkkeys file does not seem to work in "recent" distributions (tested on Ubuntu 20 and Raspberry Pi OS). Instead, link keys have to be stored in an ini-like file in a subdirectory (at least that's what works for me on said distros). The file is named "info" and resides in /var/lib/bluetooth/<dongle addr>/<device addr>/. It has the following format:

[LinkKey]
Key=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Type=4
PINLength=0

I think this behavior dates back to Ubuntu 14 but I'm not sure.

Hi,

Just wanted to open separate thread from DS4Windows.

So what I am using right now is:

1. Raspberry Pi with latest Raspbian 32 bit
2. Asus USB BT 4.0 dongle (hci1)

I setup link key for PS5 like this:

[LinkKey]
Key=PS_LINK_KEY_HERE
Type=4
PINLength=0

[General]
Name=
SupportedTechnologies=
Trusted=true
Blocked=false

DS5 was paired using share+options method and this file was generated, unmodified, it is paiered with internal
BT on RPi (hci0)

[General]
Name=Wireless Controller
Class=0x002508
SupportedTechnologies=BR/EDR;
Trusted=true
Blocked=false
Services=00001124-0000-1000-8000-00805f9b34fb;00001200-0000-1000-8000-00805f9b34fb;

[DeviceID]
Source=2
Vendor=1356
Product=3302
Version=256

[LinkKey]
Key=DS5_KEY_HERE
Type=4
PINLength=0

hcitool is not available instead there is btmgmt on latest distro

sudo btmgmt --index 1 power off

sudo btmgmt --index 1 public-addr {DS5_PAIRED_WITH_PS5}

This changes the BT dongle address to DS5 address that I paired with PS5

sudo systemctl stop bluetooth

sudo btmgmt --index 0 power on
sudo btmgmt --index 1 power on

sudo ./l2cap_proxy {PS5_BT_ADDR} {DS5_PAIRED_WITH_PS5} 0x002508

Initially I was able to get some connection established, but I can't replicate that anymore.
During that time it seems that it was not being reset by PS5

Now I am always getting this:

listening on psm: 0x0001
listening on psm: 0x0005
listening on psm: 0x0007
listening on psm: 0x000f
listening on psm: 0x0011
listening on psm: 0x0013
listening on psm: 0x0015
listening on psm: 0x0017
listening on psm: 0x0019
listening on psm: 0x001b
listening on psm: 0x001d
listening on psm: 0x001f
listening on psm: 0x0021
accepted connection from DS5_ADDR (psm: 0x0001)
connecting with DONGLE_ADDR to PS5_ADDR (psm: 0x0001)
connected to  PS5_ADDR (psm: 0x0001)
poll error from SLAVE (psm: 0x0001)
accepted connection from  DS5_ADDR (psm: 0x0011)
connecting with  DONGLE_ADDR to  PS5_ADDR (psm: 0x0011)
accepted connection from  DS5_ADDR (psm: 0x0013)
connecting with DONGLE_ADDR  to  PS5_ADDR(psm: 0x0013)
connection failed: Connection reset by peer
connection failed: Connection reset by peer
connected to PS5_ADDR  (psm: 0x0011)
connected to PS5_ADDR  (psm: 0x0013)
poll error from MASTER (psm: 0x0011)
poll error from MASTER (psm: 0x0013)

accepted connection from DS5_ADDR (psm: 0x0001)
connecting with DONGLE_ADDR  to PS5_ADDR   (psm: 0x0001)
connected to PS5_ADDR  (psm: 0x0001)
poll error from SLAVE (psm: 0x0001)
accepted connection from DS5_ADDR  (psm: 0x0011)
connecting with DONGLE_ADDR  to PS5_ADDR   (psm: 0x0011)
accepted connection from DS5_ADDR  (psm: 0x0013)
connecting with DONGLE_ADDR  to PS5_ADDR   (psm: 0x0013)
connection failed: Connection refused
connected to PS5_ADDR   (psm: 0x0011)
connection failed: Connection refused
poll error from MASTER (psm: 0x0011)
connected to PS5_ADDR   (psm: 0x0013)
poll error from MASTER (psm: 0x0013)

I have met a problem when running proxy.

I have paired DS4 and ps4 with my ubuntu in the first.
Then I got ds4 link key and store it in file "linkkkeys".
After that, I run "sudo ./l2cap_proxy " and push the DS4 home button to pair.
[master-bdaddr]: ps4 bdaddr
[dongle-bdaddr]: my dongle-bdaddr
[device-class]: 0x2508

then I got message from the terminal
"
accepted connection from 30:0E:D5:8D:83:70 (psm: 0x0001)
connecting with 00:02:72:DA:2A:7B to 8C:FE:57:45:4B:4C (psm: 0x0001)
connected to 8C:FE:57:45:4B:4C (psm: 0x0001)
poll error from SLAVE (psm: 0x0001)
"
I dumped the the information and found out that the PS4 and DS4 once connect first but disconnect in the end.
I am confused with the procedure the order of pairing. Turn on DS4 first or connect to PS4 first?
Did I need to pair DS4 with PS4 before running proxy?

Thank for your great works and hope for your reply, thanks.