Hi Oliver,

Which exact version of Android are you using in your project ?
Previously, only devices supporting VSC (Vendor SpeifiC HCI) multi-advertising were able to advertise at all. I did modify this code, now depending on controller capabilities you either get regular advertising ("legacy" according to 5.0 spec, just one instance), VSC advertising, or Bluetooth 5.0 advertising sets used.

Here is code that pick which version is avaliable:
https://android.googlesource.com/platform/system/bt/+/master/stack/btm/ble_advertiser_hci_interface.cc#546

  if (controller_get_interface()->supports_ble_extended_advertising()) {
    LOG(INFO) << "Extended advertising will be in use";
    instance = new BleAdvertiserHciExtendedImpl();
  } else if (BTM_BleMaxMultiAdvInstanceCount()) {
    LOG(INFO) << "VSC advertising will be in use";
    instance = new BleAdvertiserVscHciInterfaceImpl();
    BTM_RegisterForVSEvents(
        BleAdvertiserVscHciInterfaceImpl::VendorSpecificEventCback, true);
  } else {
    LOG(INFO) << "Legacy advertising will be in use";
    instance = new BleAdvertiserLegacyHciInterfaceImpl();
  }


Even though the Adapter.isMultiAdvertisingSupported() will return false, you should still be able to start one advertising instance on latest source, if you are running latest AOSP code.

On Wed, Mar 8, 2017 at 5:24 AM Olivier MARTIN <olivier@labapart.com> wrote:

Thanks Miles, yes the functionality I am looking is exposed in the Java API but the issue is Hikey does not support it. For instance for the example "android-BluetoothAdvertisements", it returns "Bluetooth Advertisements are not supported on this device."
That's why I started to go down the stack to see how I could enable this support in the BSP.

I am making some progress in my understandings of Bluetooth stack. Fluoride (new name for Bluedroid since Android 6.0) located in `https://android.googlesource.com/platform/system/bt` plays the role of HAL module.
To add BLE peripheral support to a chipset (for instance Hikey's TI WL1835MOD chipset), I would need to implement the HCI commands.
I have not still figured out where these HCI are implemented.

I found TI chipset support in:
- https://android.googlesource.com/platform/hardware/ti/wpan/ (last change more than 3 years ago)
- https://android.googlesource.com/device/linaro/hikey/+/master/wpan/
- https://android.googlesource.com/kernel/hikey-linaro/+/android-hikey-linaro-4.4
... but no trace of Android Fluoride HCI commands.

For instance, one of the commands needed for BLE Peripheral role is LE_Multi_Advt_Command (OCF:0x154). But I cannot find any drivers implementing it.


On 08.03.2017 13:52, Myles Watson wrote:

Hi Olivier,
 
Have you seen the sample applications on the developer site?

https://developer.android.com/samples/BluetoothLeGatt/index.html
https://developer.android.com/samples/BluetoothAdvertisements/index.html
 
I think the functionality you are looking for is exposed in the Java APIs.  You shouldn't need to send HCI commands directly or implement any low-level GATT code.
 
Thanks,
Myles

On Wed, Mar 8, 2017 at 2:33 AM, Olivier MARTIN <olivier@labapart.com> wrote:
Hi all,
for one of my projects I need my Android device to act as a Bluetooth LE peripheral device. I noticed this feature has been added in Android 5.0 (https://developer.android.com/about/versions/android-5.0.html). Unfortunately my Nexus 4 is unlikely to get this feature (https://altbeacon.github.io/android-beacon-library/beacon-transmitter-devices.html). But I also have a 96Board Hikey board that has become an official platform in AOSP.

Is there a plan to support Bluetooth LE peripheral role to Hikey? If yes, any idea of the ETA?
I would not necessary excited to do it but if there is no plan I would add the support myself. I am familiar with GATT (Bluez), JNI, Linux Kernel, Android application. I know the Hikey is capable of BLE peripheral as I already used Bluez and its DBus interface to make Hikey appears a BLE peripheral.

I am new to AOSP world. So I am a bit lost in the various components. I already read these pages:
- https://source.android.com/devices/index.html: Android Interfaces and Architecture
- https://source.android.com/devices/bluetooth.html: Bluetooth
- https://source.android.com/devices/Android-6.0-Bluetooth-HCI-Reqs.pdf: Android 6.0 Bluetooth HCI Requirements

I understand the HAL peripheral support is generally divided in module (defined by hw_module_t) and device (defined by hw_device_t).
I saw HAL interfaces are defined by libhardware and potentially the one that would interest me is `bt_gatt_server.h`.
But I am a bit unclear by the link between Android Bluetooth HCI and `bt_gatt_server.h`.
If I wanted to add GATT Server to Hikey what should I do?

Sorry if you have nothing to do with this issue. I collected emails around repositories and web resources. I am not sure who is the best person to answer this question.

Thanks in advance,
Olivier