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// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
using fuchsia.bluetooth;
using fuchsia.bluetooth.control;
using fuchsia.bluetooth.gatt;
using fuchsia.bluetooth.le;
using fuchsia.bluetooth.bredr;
// TODO(BT-814): Convert all comments below to doc-comments.
/// Represents persistent local host data.
// TODO(BT-813): Consider using a table instead of struct.
struct HostData {
/// The local Identity Resolving Key used by a bt-host device to generate Resolvable Private
/// Addresses when privacy is enabled.
/// NOTE: This key is distributed to LE peers during pairing procedures. The client must take
/// care to assign an IRK that consistent with the local bt-host identity.
// TODO(BT-815): Document behavior once there is a better privacy policy when |irk| is null.
LocalKey? irk;
// Interface for interacting with a Bluetooth host device (bt-host)
protocol Host {
// The following methods fulfill a given interface request. bt-host device
// will start processing FIDL messages. If the request cannot be fulfilled,
// the bt-host device will close its end of the given channel.
RequestLowEnergyCentral(request<fuchsia.bluetooth.le.Central> central);
RequestLowEnergyPeripheral(request<fuchsia.bluetooth.le.Peripheral> peripheral);
RequestGattServer(request<fuchsia.bluetooth.gatt.Server> server);
RequestProfile(request<fuchsia.bluetooth.bredr.Profile> profile);
// Shuts down the host, ending all active Bluetooth procedures:
// * All FIDL interface handles associated with this host are closed and all
// connections initiated via FIDL clients are severed.
// * All scan, discovery, and advertising procedures are stopped.
// * Bonded devices are cleared and removed from the auto-connect lists.
// * Auto-connected peripherals are disconnected.
// This effectively resets the host to its initial state and the host remains
// available for future requests.
// The Host will continue to send OnDeviceUpdated events as procedures get
// terminated.
// Returns information about the Bluetooth adapter managed by this host.
GetInfo() -> (fuchsia.bluetooth.control.AdapterInfo info);
/// Assigns local data to this host.
SetLocalData(HostData host_data);
// Returns a list of all known connectable devices, included those that are
// currently connected and/or bonded. This list does not include
// non-connectable devices such as LE broadcasters.
// Notes:
// - When used in the GAP central role (BR/EDR or LE) the listed devices are
// obtained during discovery and connection procedures. While in the
// peripheral role, this will contain devices that have successfully initiated
// connections to this host.
// - This list contains connectable devices that are discovered or connected
// via other interfaces obtained using the interface request methods declared
// above.
ListDevices() -> (vector<fuchsia.bluetooth.control.RemoteDevice> devices);
// Sets the local name for this adapter.
SetLocalName(string local_name) -> (fuchsia.bluetooth.Status status);
// Sets the device class for this adapter.
SetDeviceClass(fuchsia.bluetooth.control.DeviceClass device_class)
-> (fuchsia.bluetooth.Status status);
// Initiates a general discovery procedure for BR/EDR and LE devices. On success, discovered
// devices will be reported via AdapterDelegate.OnDeviceDiscovered().
// On the LE transport, only general-discoverable and connectable peripherals will be reported.
// Discovery will continue until it is terminated via StopDiscovery() or if the proxy to the
// Adapter gets disconnected. If the device does not support BR/EDR, only LE
// discovery will be performed.
// An OnDeviceUpdated event will be sent when the discovery procedures are
// started.
StartDiscovery() -> (fuchsia.bluetooth.Status status);
// Terminates discovery if one was started via StartDiscovery(). The AdapterDelegate will stop
// receiving device discovery notifications.
// NOTE: If another client is performing discovery (e.g. via its own le.Central interface handle),
// then the system will continue performing device discovery even if this method results in
// success.
StopDiscovery() -> (fuchsia.bluetooth.Status status);
// Sets whether this host should be connectable.
SetConnectable(bool enabled) -> (fuchsia.bluetooth.Status status);
// Sets whether this host should be discoverable.
SetDiscoverable(bool enabled) -> (fuchsia.bluetooth.Status status);
// Establish a BR/EDR and/or LE connection to the remote device with identifier |device_id|:
// - If the device is known to support the BR/EDR transport then a logical link over that
// transport will be established to the device. If the connection attempt is successful,
// local services registered using "RequestProfile()" will be available to the peer.
// Traditional services discovered on the peer will be notified to local services
// asynchronously.
// - If the device is known to support the LE transport then a logical link over that
// transport will be established to the device. If the connection attempt is successful,
// GATT services in the local database (populated via RequestGattServer()) will become
// available to the peer. Similarly, remote GATT services that are discovered on the
// peer will become available to holders of a gatt.Client capability and to device drivers
// that can bind to the bt-gatt-svc class of devices.
// The result of the procedure will be communicated via |status|. If the remote device
// supports both BR/EDR and LE transports and a link cannot be established over both, then an
// error Status will be returned and neither transport will be connected.
Connect(string device_id) -> (fuchsia.bluetooth.Status status);
/// Deletes a peer from the Bluetooth host. If the peer is connected, it will be disconnected,
/// then OnDeviceUpdated will be sent. OnDeviceRemoved will be sent. |device_id| will no longer
/// refer to any peer, even if a device with the same address(es) is discovered again.
/// Returns success after no peer exists that's identified by |device_id| (even if it didn't
/// exist before Forget), failure if the peer specified by |device_id| could not be
/// disconnected or deleted and still exists.
Forget(string device_id) -> (fuchsia.bluetooth.Status status);
// Enable or disable a passive LE background scan. When enabled, the bt-host
// device will continuously perform a passive LE scan in the background when
// no device discovery sessions are active and accept connection requests from
// bonded peripherals.
EnableBackgroundScan(bool enabled);
/// Enable or disable the LE privacy feature. When enabled, the bt-host device will use a private
/// device address in all LE procedures. When disabled, the public identity address will be used
/// instead (which is the default).
EnablePrivacy(bool enabled);
// Assigns the pairing delegate that will respond to authentication challenges using the given
// I/O capabilities. Setting a pairing delegate cancels any on-going pairing procedure started
// using a previous delegate. Pairing requests will be rejected if no PairingDelegate has been
// assigned.
fuchsia.bluetooth.control.InputCapabilityType input,
fuchsia.bluetooth.control.OutputCapabilityType output,
fuchsia.bluetooth.control.PairingDelegate? delegate);
// Adds existing bonded devices to the host. The host will be configured to automatically connect
// to these devices when they are in range and connectable. Future connections will be encrypted
// using the provided bonding data.
AddBondedDevices(vector<BondingData> bonds) -> (fuchsia.bluetooth.Status status);
// ===== Events =====
// Notifies when the adapter state changes.
-> OnAdapterStateChanged(fuchsia.bluetooth.control.AdapterState state);
// Events that are sent when a connectable device is added, updated, or
// removed as a result of connection and discovery procedures.
-> OnDeviceUpdated(fuchsia.bluetooth.control.RemoteDevice device);
-> OnDeviceRemoved(string identifier);
// Notifies when bonding data for a device has been updated.
-> OnNewBondingData(BondingData data);
// TODO(BT-194): Introduce a "OnBondRemoved()" event to notify when existing
// keys become stale.