Modifications based on the work of @cookj273

[oxesoft]

Based on the pool request https://github.com/ftonello/bluez/pull/3

• annotations fixed;
• at the beginning waits for an eligible card device's port;
• implemented advertisement using hci functions;
• after the BLE connection done, automatically connect the previously mentioned ALSA port to the "BLE-MIDI Device" one;
• fixed the slow connection time removing the characteristics GATT_CHARAC_DEVICE_NAME, GATT_CHARAC_EXT_PROPER_UUID, GATT_CHARAC_APPEARANCE, GATT_CHARAC_SERVICE_CHANGED and GATT_CLIENT_CHARAC_CFG_UUID. It can be turned on defining ENABLE_EXTRA_CHARACTERISTICS.

[ftonello]

Please, make sure you fix basic issues and that you follow the coding style before submiting patches.

• http://git.kernel.org/cgit/bluetooth/bluez.git/tree/doc/coding-style.txt
• https://www.kernel.org/doc/Documentation/process/ specially 4.Coding.rst

[oxesoft]

Once everything is working properly, I'll make a code refactoring respecting both references. If I do it now, the changes's rastreability turns impossible.

[ftonello]

Ok, then you should re-open this pull-request. I will close it for now so we don't get notifications as you change your branch.

[oxesoft]

I can't reopen it. I have a new commit.

[ftonello]

Hi Daniel, I have your branch here and I am basically rewriting most of the code. But we are definitelly in the right direction.

I am doing right now is:

• TONS of cleanup
  • duplicated code
  • unnecessary code
  • make proper usage of aggregates
  • use Linux/POSIX code style
  • etc
• Improving the GATT server table
  • Remove unecessary characteristics and descriptors
  • Add PPCP characteristic
  • etc
• Advertise Slave Connection Interval preference
• etc

As soon as I have something I will publish here so you can test as well. Cheers.

[oxesoft]

@ftonello it looks a very funny rewriting. :-) I'm very interested in getting it working well. It will be a pleasure to test. I'm writing a separate tool for solve my use case (USB-MIDI over BLE-MIDI adapter). Once I test it at night I'll post the link here.

[oxesoft]

Here is: https://github.com/oxesoft/rpi-midi-ble