Missing messages

[tchelomgf]

Hi:

I´ve installed on Raspberry Pi 1 B+, using a BLE USB dongle.

I´m able to start btmidi-server on RPi, connect with my iPad, using Set List Maker app.
I´m using another solution for USB MIDI routing - https://github.com/fralalonde/autoroute - it works perfectly, since you create a ALSA MIDI device that I can configure in autoroute service.

Some issues I´ve found:

The name of the service is not properly showed, i.e. "RPiBlue" on btmidi-server call, I see FC097FC4-9FD2-4E8F-A900-54D48F4F06FA

Short and individual MIDI messages like Note On, Note OFF, Controller are transported correctly. It´s working, congrats ! However:

If I send lot of Notes together at same time (~4) some of them are missed.
if I send more than one controller messages together in sequence, some messages are missed, adding 00 byte between each message is a workaround...
Seems some kind of buffer/message packing handling needed.
Are you facing same issues ?
Is there a tip to help me to find out these issues ?

Thanks!

Ps.: Sempre bom ver BRs por trás de projetos legais como esse.

[bichpham]

I used it with iphone/ipad garageband without any issues with multiple notes. The name showed up as FC09xxxx in mine whenever swap out the SD card for another raspberry pi. I just had to delete all the names from the ios ble list and everything showed up properly again.

[tchelomgf]

Hi @bichpham , could you confirm your setup ?
a) Raspberry pi version ?
b) OS version ?
c) CPU Overclock ?
d) I´m using with verbose option, running btmidi-server on a terminal inside of the X IDE. Have you checked in this condition also ?

Thanks !

[bichpham]

tchelomgf,

I did not do anything fancy. No overlocking. I worked for me on raspbery pi 3 and pi zero w. I did it 2 years ago with the latest raspbian. Don't remember what version of raspbian though.

[tchelomgf]

Something has been changed in the kernel by the years, causing some incompatibility. After some debugging, seems that a queue handling is necessary on Bluez stack.

[kawnas]

Hello i'm facing kind of the same issues. Sending midi messages on multiple channels and a midi clock with a puredata Sequencer from my raspberry to iPad, there i recieve correct messages only if i send on one midi channel, otherwise it merges the Midi messages sent From different midi channels to only one channel, actually the bigger one in number. I also recieve on ipad a lot of invalid messages.it is really disappointing because the system is otherwise fine working. Please help me:)