Midi Ble connect - Android 11 - Galaxy Tab S5e can't find Ble midi device

[Cysign]

Hi,
just bought a AkaiPRO LPK25 wireless to use with my tabled and smartphone.
On my Redmi Note 7, running on LineageOS 18.1 official, the "Midi Ble connect"-app works perfect. But on my Galaxy S5e tables (runnin gon stock ROM, Android 11) the Midi Ble connect-app can't find the LPK25 wireless midi keyboard.

The tablet can find the LPK 25 wireless using the Android default bluetooth app, but without the Midi Ble connect app it can't pair properly for midi purpose.

Contacting the developer he told me to open a case right here containind the information above.

[philburk]

Thanks for reporting this.,
I tried the following on a Galaxy Tab A running Android 10 (Q).

1. Launched MIDI+BTLE app.
2. Switched Akai LPK25 Wireless to BT mode.
3. Pressed "Pair" button on LPK25.
4. Pressed "SCAN" button on app.
5. Akai LPK25 appeared within a few seconds.
6. Selected it.
7. Pressed Home button on tablet.
8. Launched Synth Example.
9. Selected Akai LPK25.
10. Played notes using BLE-MIDI.

@Cysign - At what step was your experience different?

Maybe there was a regression between Android 10 and 11 on the Galaky tablets.
Or there is a problem specific to the Tab S5e.

[Cysign]

Steps 1-4 are identical. But step 5 is impossible, as the LPK25 wireless isn't detected.

When I open the usual bluetooth menu on the tablet I do see the LPK25 wireless. So it's doesn't seem to be a problem with the bluetooth chip in the tablet.

[philburk]

I went into Bluetooth Settings and tried to connect using the Bluetooth Connection dialog.
The Settings app did not display the Akai LKP25.

@Cysign - If your tablet is currently paired with the LPK25 using the Bluetooth settings then try forgetting that connection. Maybe it is blocking the MIDI+BTLE app.

[Cysign]

It's not paired. As soon as I pair the LPK25 using the system's bluetooth dialogue, it's paired, but not connected (even on my phone where I can connect to it properly with the Midi Ble connect app).

[Cysign]

Here's what it looks like:
https://youtu.be/JcQiYYrDE3s

[philburk]

Thanks for the video. It looks like the LPK25 is showing up as an available device in Settings but not in the MIDI+BTLE app.
The opposite normally happens for me.

I tried again with the BT Settings. This time the LPK25 showed up and I tried to pair with it. The pairing failed.
Then I tried the MIDI+BTLE app and the LPK25 did not show up!
So now I am seeing the same thing you are.

Try rebooting your tablet,
then toggle the Akai LPK25 Bluetooth mode off then on,
then try the MIDI+BTLE app.
Does it now see the LPK25?

The Bluetooth Settings are not connected to the MIDI Service in Android 11.
So the Bluetooth Settings will NOT help with MIDI.
But if the BT service is holding onto the device then it may interfere with the MIDI+BTLE app.