Fix Bluetooth

[Francky46]

his version of raspberry pi OS in 64bit has a problem with bluetooth, especially when it comes to executing the connect command, who will give this error:

Failed to connect: org.bluez.Error.Failed

Indeed, the mac address of the agent is "E4:5F:01" which is not good for Raspberry Pi 4, the mac address should start with "B8:27:EB". To check this you can for example type this command :

sudo hcitool dev

If the mac address is not right, you can fix this by editing this file :

sudo nano /usr/bin/btuart

Comment on the first "if", "else" and "fi", for example :

 #!/bin/sh

HCIATTACH=/usr/bin/hciattach
#if grep -q "raspberrypi,4" /proc/device-tree/compatible; then
  BDADDR=
#else
  SERIAL=`cat /proc/device-tree/serial-number | cut -c9-`
  B1=`echo $SERIAL | cut -c3-4`
  B2=`echo $SERIAL | cut -c5-6`
  B3=`echo $SERIAL | cut -c7-8`
  BDADDR=`printf b8:27:eb:%02x:%02x:%02x $((0x$B1 ^ 0xaa)) $((0x$B2 ^ 0xaa)) $((0x$B3 ^ 0xaa))`
#fi