Trying to revive 'ubtd' (Bluetooth file transfer)

PhAndersson

@domubpkm said:

@PhAndersson Can connect with bluetooth a Volla with Volla OS to a Volla 22 with UT noble.

There is currently a bug in Noble (up to 24.04-1.2) that prevents the OBEX daemon from starting.

The fix exists and is already merged. Here is the related MR: https://gitlab.com/ubports/development/core/ubuntu-touch-session/-/merge_requests/81. It is supposed to be part of the upcoming 24.04-1.3.

Based on earlier tests by @gpatel-fr, once this fix is available, 'ratatoskr' should work on Noble as well.

gpatel-fr

@PhAndersson

yes that's it.
@domubpkm
you can add the fix even on stable with a systemd overlay file.

phablet@ubuntu-phablet:~$ systemctl --user cat obex
# /usr/lib/systemd/user/obex.service
[Unit]
Description=Bluetooth OBEX service

[Service]
Type=dbus
BusName=org.bluez.obex
ExecStart=/usr/libexec/bluetooth/obexd

[Install]
Alias=dbus-org.bluez.obex.service

# /usr/lib/systemd/user/obex.service.d/ubuntu-touch-session.conf
[Service]
ExecStart=
ExecStart=/usr/lib/bluetooth/obexd -P ftp,irmc,mas,pcsuite -r $HOME

# /home/phablet/.config/systemd/user/obex.service.d/xxoverride.conf
[Service]
ExecStart=
ExecStart=/usr/libexec/bluetooth/obexd -P ftp,irmc,mas,pcsuite -r $HOME

after adding the overlay, you have to restart the obex service using systemctl --user restart obex

domubpkm

@PhAndersson @gpatel-fr So the fix is in 1.3 daily. Wait 1.3 candidate to test. Thanks.

domubpkm

@phandersson ok. I switched to dev channel and i tried to send a (big) file from my Volla 22 with UT to a Volla with volla OS with your last update : it works now. . But i found the transfer speed was very slow. Could it be improve or not ?

projectmoon

@domubpkm there is only so much data you can push over Bluetooth. Bluetooth file transfer will always be slow (sometimes very very slow).

PhAndersson

@domubpkm said:

@phandersson ok. I switched to dev channel and i tried to send a (big) file from my Volla 22 with UT to a Volla with volla OS with your last update : it works now. .

Excellent news -- thanks for the feedback.

But i found the transfer speed was very slow. Could it be improve or not ?

Could you be a bit more specific, please? From what I read online, typical Bluetooth transfer speeds are between 1 and 3 Mbps.

When I tested the app prior to releasing v0.1.1, I measured 1.3 Mbps when pushing a large file from my (Linux) laptop to the phone (Pixel 3a).

Do you get a comparable bandwidth, or something much lower? (to measure it, I simply time the transfer and divide it by the file size).

domubpkm

@phandersson I transferred a RAR file from UT smartphone to another with Volla OS, because no function to decompress RAR on UT. Did not work directly, extension not recognized. On the other hand, workaround by transforming the RAR extension into mp4: ok, worked. Then I put the RAR extension back in, and unzipped it without any problem. Just tested this. Make Ratatoskr recognize various extensions?

domubpkm

@PhAndersson 9 minutes for 130 MB from Volla 22 UT to Volla 22 volla OS.

gpatel-fr

@domubpkm

Well, if my calculation is correct that means about 2Mbits/s, it seems quite decent for Bluetooth.

PhAndersson

@domubpkm said:

@phandersson I transferred a RAR file from UT smartphone to another with Volla OS, because no function to decompress RAR on UT. Did not work directly, extension not recognized. On the other hand, workaround by transforming the RAR extension into mp4: ok, worked. Then I put the RAR extension back in, and unzipped it without any problem. Just tested this.

Thanks for the feedback.

Make Ratatoskr recognize various extensions?

Well spotted -- the main app will accept incoming files of any type, but the SharePlugin only registers itself as handler for a limited number of file types. For no particular reason, as far as I know.

I've created the following issue to track this: https://github.com/petroniusniger/ratatoskr/issues/34

PhAndersson

@gpatel-fr said:

@domubpkm

Well, if my calculation is correct that means about 2Mbits/s, it seems quite decent for Bluetooth.

Agreed.