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Petefoth SailfishOS: Bluetooth in Android AppSupport

Pete documents his solutions to allowing android apps (the lxc container) bluetooth access in his repo:

https://codeberg.org/petefoths-projects/SfOS-Bluetooth-in-AAS/

or 

https://codeberg.org/poetaster/SfOS-Bluetooth-in-AAS 

Implementation of a method in SailfishOS (SfOS) to allow user to switch Bluetooth (BT) support between SfOS and Android AppSupport (AAS).

Current status

As stated in this forum post

I have something similar working using qCommand app: switching BT to AAS is working fine; switching it back to SfOS is still ‘work-in-progress’ - sometimes it works, sometimes not.

Current status of my qCommand stuff. (For both commands I've commented out the if systemctl is-active condition, because it's not working as expected)

qc_BT-to-Android : mostly works. I can connect to and sync my watch in the Garmin Connect Android app, and connect to and control my hearing aids in the BeMore Android app.

Code 
if [[ ! $(whoami) = "root" ]]; then
echo "must be run as root" >&2
exit 1
fi

# start by setting up the config file,even if it exists already
echo "[Config]" > /opt/appsupport/etc/appsupport.conf.d/99-passthrough.conf
echo "Proxies=android.hardware.bluetooth@1.1::IBluetoothHci,android.hardware.bluetooth@1.0::IBluetoothHci/default" >> /opt/appsupport/etc/appsupport.conf.d/99-passthrough.conf

# Stop the BT services in SfOS
systemctl stop bluetooth
systemctl stop bluebinder

# Start AAS if it isn't running already:
# returns 3 if inactive
# 0 if active
if [[ ! $(systemctl is-active --quiet appsupport@defaultuser.service) = 0 ]]; then
  echo "starting appsupport"
  systemctl reload-or-restart appsupport@defaultuser
fi

# Start the Android BT process
appsupport-attach pm enable com.android.bluetooth

qc-BT-to-SfOS: mostly works. Occasionally gives an error when starting bluebinder times out. (I haven't checked the status of BT in SfOS if the error occurs. Nor have I looked into detail in "journalctl -xe". That, and sorting out the operations conditional on systemctl is-active are the next jobs :slight_smile:

Code 
if [[ ! $(whoami) = "root" ]]; then
  echo "must be run as root" >&2
  exit 1
fi

# If AAS is running, stop / disable its BT  process
#if [[ $(systemctl is-active --quiet appsupport@defaultuser.service) = 0 ]]; then
echo "DisablingBT in Android" 
  appsupport-attach pm disable com.android.bluetooth
echo "Stopping AAS" 
  systemctl stop appsupport@defaultuser 
#fi

# Start the BT services in SfOS
echo "Starting bluebinder" 
systemctl start bluebinder
echo "Starting AAS" 
systemctl start appsupport@defaultuser  
echo "Restarting bluetooth" 
systemctl  restart bluetooth

Occasional error

Job for bluebinder.service failed because a timeout was exceeded.
See "systemctl status bluebinder.service" and "journalctl -xe" for details.`

Background

The means to allow BT access for Android apps running under AAS is described in this post in the SfOS communtiy forum. As described in that post and replies, BT can be available EITHER to SfOS OR to AAS, but not to both. The aim of this project is to proved a means for users to switch BT availability between SfOS and AAS.

Use cases

My use cases:

  1. Garmin Smartwatch: download golf course data from Garmin Connect Android app running on the phone. As far as I know, this is the only way to achieve this: it is not possible to download Golf Course data from PC to watch. (Note this is a multi-sport watch and golf courses are not pre-loaded: they must be loaded from the phone. For dedicated Golf watches, with courses preloaded, course updates can be downloaded from PC or Web)
  2. BeMore Hearing Aid control app. Proprietary Android app that allows fine-grained control of hearing aids - volume, noise filters, favourite settings

These operations are both short in duration: the workflow would be

  1. Enable BT in AAS
  2. Perform the operation
  3. Disable BT in AAS and re-enable it in SfOS

The proposed solution would also meet the needs of users who wish to have BT access available to AAS

  1. all the time: never available to SfOS
  2. for as long as AAS is running

Implementation

I think this solution can be implemented by

  1. Creating two shell scripts:
  • bt-to-aas.sh enables BT in AAS
  • bt-to-sfos.sh enables BT in SfOS
  1. Implementing a mechanism to call thses scritps from the SfOS UI

Enable BT in AAS (bt-to-aas.sh)

  1. stop AAS if it is running - (is this doable from a script?). Or leave it running while we do steps 2 & 3, and restart ASS in step 4
  2. stop bluetooth and bluebinder services
  3. add (or uncomment) this line (using sed?) to /opt/appsupport/etc/appsupport.conf.d/10-hybris.conf Proxies=android.hardware.bluetooth@1.1::IBluetoothHci,android.hardware.bluetooth@1.0::IBluetoothHci/default
  4. start (or restart) AAS - (is this doable from a script, rather than from SFOS settings menu)

Enable BT in SfOS (bt-to-sfos.sh) I am less sure about what is needed here. A 'quick and dirty solution might be to edit the 10-hybris.conf file then reboot the phone. I would prefer a slightly more elegant and less destructive solution :slight_smile:

  1. do I need to stop bluetooth and bluebinder services again, or are they still not still not running since being stopped in the bt-to-aas.sh script?
  2. stop AAS
    1. is this necessary or can we just restart it once we have changed the 10-hybris.conf file?
    2. is this: do-able from a script ?
  3. OR disable AAS Android Bluetooth package, but leave AAS running
  4. remove (or comment) this line( using sed?) to /opt/appsupport/etc/appsupport.conf.d/10-hybris.conf Proxies=android.hardware.bluetooth@1.1::IBluetoothHci,android.hardware.bluetooth@1.0::IBluetoothHci/default
  5. restart bluetooth bluebinder and services
  6. restart AAS (optional: we could leave this to be done manually)

Problems to solve

  • How to stop
    • AAS if running: normally do this from from SFOS settings menu. Can we do it via a script?
    • Stop bluetooth and bluebinder services: Solved in forum post

systemctl stop bluetooth

systemctl stop bluebinder

  • How to change the contents of 10-hybris.conf?
    • answer probably involves sed. I need to experiment to find out how to
      1. add the needed line in 10-hybris.conf
      2. remove the added line in 10-hybris.conf
  • Better approach: don't touch 10-hybris.conf, use a different file.
    • Delete it to enable BT in SfOS
    • Create it to enable BT in AAS

`echo "Proxies=android.hardware.bluetooth@1.1::IBluetoothHci,android.hardware.bluetooth@1.0::IBluetoothHci/default" > /opt/appsupport/etc/appsupport.conf.d/99-passthrough.conf

  • Where in the device filesystem will the scripts live? And how will they get there?

  • How to invoke the scripts so that they have root / devel-su access to perform privileged operations (e.g. starting / stopping systemd services)?

    You can run scripts as root by using qCommand app or Sailcron (at selected time). Scripts which don’t need root are possible to run from launcher by creating *.desktop file. Scripts which don’t need root are possible to run from launcher by creating *.desktop file.

    Both our scripts will need root I think


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