fuchsia.bluetooth.le

PROTOCOLS

AdvertisingHandle

Defined in fuchsia.bluetooth.le/peripheral.fidl

Capability that is valid for the duration of advertising. The caller can close the handle to stop advertising. If the system internally stops advertising for any reason, the handle will be closed to communicate this to the client.

Central

Defined in fuchsia.bluetooth.le/central.fidl

ConnectPeripheral

Creates a connection to the peripheral device with the given identifier. Returns the status of the operation in status.

On success, gatt_client will be bound and can be used for GATT client role procedures. On failure, gatt_client will be closed and status will indicate an error.

Request

Name	Type
identifier	fuchsia.bluetooth/PeerIdString
options	ConnectionOptions
gatt_client	request<fuchsia.bluetooth.gatt/Client>

Response

Name	Type
status	fuchsia.bluetooth/Status

DisconnectPeripheral

Disconnects this Central's connection to the peripheral with the given identifier.

Request

Name	Type
identifier	fuchsia.bluetooth/PeerIdString

Response

Name	Type
status	fuchsia.bluetooth/Status

GetPeripheral

Returns information about a single peripheral that is known to the system from previous scan, connection, and/or bonding procedures based on its unique identifier. Returns null if identifier is not recognized.

Request

Name	Type
identifier	fuchsia.bluetooth/PeerIdString

Response

Name	Type
peripheral	RemoteDevice?

GetPeripherals

Returns the list of peripherals that are known to the system from previous scan, connection, and/or bonding procedures. The results can be filtered based on service UUIDs that are known to be present on the peripheral.

This method only returns peripherals (i.e. connectable devices).

Request

Name	Type
service_uuids	vector<string>?

Response

Name	Type
peripherals	vector<RemoteDevice>

OnDeviceDiscovered

Called for each peripheral/broadcaster that is discovered during a scan session. rssi contains the received signal strength of the advertising packet that generated this event, if available.

Response

Name	Type
device	RemoteDevice

OnPeripheralDisconnected

Called when this Central's connection to a peripheral with the given identifier is terminated.

Response

Name	Type
identifier	fuchsia.bluetooth/PeerIdString

OnScanStateChanged

Called when the scan state changes, e.g. when a scan session terminates due to a call to Central.StopScan() or another unexpected condition.

Response

Name	Type
scanning	bool

StartScan

Initiates a scan session for nearby peripherals and broadcasters. Discovered devices will be reported via CentralDelegate.OnDeviceDiscovered(). If a scan session is already in progress, filter will replace the existing session's filter.

If filter is null or empty (i.e. none of its fields has been populated) then the delegate will be notified for all discoverable devices that are found. This is not recommended; clients should generally filter results by at least one of filter.service_uuids, filter.service_data, and/or filter.manufacturer_identifier.

Request

Name	Type
filter	ScanFilter?

Response

Name	Type
status	fuchsia.bluetooth/Status

StopScan

Terminate a previously started scan session.

Request

Name	Type

Connection

Defined in fuchsia.bluetooth.le/peer.fidl

Protocol that represents the connection to a peer. This can be used to interact with GATT services and establish L2CAP channels.

Peripheral

Defined in fuchsia.bluetooth.le/peripheral.fidl

OnPeerConnected

Event delivered when a remote LE central initiates a connection to this Peripheral when connectable advertising is enabled via Peripheral.StartAdvertising.

The returned Connection handle can be used to interact with the peer. It also represents a peripheral's ownership over the connection: the client can drop the handle to request a disconnection. Similarly, the handle is closed by the system to indicate that the connection to the peer has been lost.

• request peer Information about the central that initiated the connection.
• request handle Represents the connection.

Response

Name	Type
peer	Peer
connection	Connection

StartAdvertising

Start advertising as a LE peripheral. An empty response is sent to indicate when advertising has successfully initiated. If advertising cannot be initiated, then the response will contain a PeripheralError.

This method can get called any number of times and successive calls can be made to reconfigure the advertising parameters. However only the most recent AdvertisingHandle will remain valid.

An instance of Peripheral can only have one active advertisement at a time. Clients must obtain multiple Peripheral instances for multiple simultaneous advertisements.

If the client closes its end of the AdvertisingHandle channel, advertising will be stopped. If the handle is closed before the request is fulfilled, advertising will be briefly enabled before it is terminated.

• request parameters Parameters used while configuring the advertising instance.
• request handle Handle that remains valid for the duration of this advertising session.

• error Returns a PeripheralError if advertising cannot be initiated. In this case the handle will be closed.

Request

Name	Type
parameters	AdvertisingParameters
handle	request<AdvertisingHandle>

Response

Name	Type
result	Peripheral_StartAdvertising_Result

STRUCTS

AdvertisingDataDeprecated

Defined in fuchsia.bluetooth.le/types_deprecated.fidl

Represents advertising and scan response data advertised by a broadcaster or peripheral.

Name	Type	Description	Default
name	fuchsia.bluetooth/DeviceName	Name of the device.	No default
tx_power_level	fuchsia.bluetooth/Int8?	The radio transmission power level reported in the advertisement.	No default
appearance	fuchsia.bluetooth/UInt16?	The appearance reported in the advertisemet.	No default
service_uuids	vector<string>?	List of service UUIDs reported in the advertisement.	No default
service_data	vector<ServiceDataEntry>?	Service data included in the advertisement.	No default
manufacturer_specific_data	vector<ManufacturerSpecificDataEntry>?	Manufacturer specific data entries.	No default
solicited_service_uuids	vector<string>?	Service UUIDs that were solicited in the advertisement. Peripherals can invite centrals that expose certain services to connect to them using service solicitation.	No default
uris	vector<string>?	URIs included in the advertising packet. These are full URIs (they are encoded/decoded automatically)	No default

ManufacturerData

Defined in fuchsia.bluetooth.le/advertising_data.fidl

Entry in the manufacturer_data field of a AdvertisingData.

Name	Type	Description	Default
company_id	uint16		No default
data	vector<uint8>[252]		No default

ManufacturerSpecificDataEntry

Defined in fuchsia.bluetooth.le/types_deprecated.fidl

Name	Type	Description	Default
company_id	uint16		No default
data	vector<uint8>		No default

Peripheral_StartAdvertising_Response

Defined in fuchsia.bluetooth.le/peripheral.fidl

Name	Type	Description	Default

RemoteDevice

Defined in fuchsia.bluetooth.le/types_deprecated.fidl

Represents a remote Bluetooth Low Energy device. A RemoteDevice can represent a central, broadcaster, or peripheral based on the API from which it was received.

Name	Type	Description	Default
identifier	fuchsia.bluetooth/PeerIdString	Identifier that uniquely identifies this device on the current system.	No default
connectable	bool	Whether or not this device is connectable. Non-connectable devices are typically acting in the LE broadcaster role.	No default
rssi	fuchsia.bluetooth/Int8?	The last known RSSI of this device, if known.	No default
advertising_data	AdvertisingDataDeprecated?	Advertising data broadcast by this device if this device is a broadcaster or peripheral.	No default

ScanFilter

Defined in fuchsia.bluetooth.le/types_deprecated.fidl

Filter parameters for use during a scan. A discovered peripheral or broadcaster will be reported to applications only if it satisfies all of the provided filter parameters. Null fields will be ignored.

Name	Type	Description	Default
service_uuids	vector<string>?	Filter based on advertised service UUIDs. A peripheral that advertises at least one of the entries in service_uuids will satisfy this filter.	No default
service_data_uuids	vector<string>?	Filter based on service data containing one of the given UUIDs.	No default
manufacturer_identifier	fuchsia.bluetooth/UInt16?	Filter based on a company identifier present in the manufacturer data. If this filter parameter is set, then the advertising payload must contain manufacturer specific data with the provided company identifier to satisfy this filter.	No default
connectable	fuchsia.bluetooth/Bool?	Filter based on whether or not a device is connectable. For example, a client that is only interested in peripherals that it can connect to can set this to true. Similarly a client can scan only for braodcasters by setting this to false.	No default
name_substring	fuchsia.bluetooth/DeviceName	Filter results based on a portion of the advertised device name.	No default
max_path_loss	fuchsia.bluetooth/Int8?	Filter results based on the path loss of the radio wave. A device that matches this filter must satisfy the following: Radio transmission power level and received signal strength must be available for the path loss calculation; The calculated path loss value must be less than, or equal to, max_path_loss.	No default

ServiceData

Defined in fuchsia.bluetooth.le/advertising_data.fidl

Entry in the service_data field of a AdvertisingData.

Name	Type	Description	Default
uuid	fuchsia.bluetooth/Uuid		No default
data	vector<uint8>[252]		No default

ServiceDataEntry

Defined in fuchsia.bluetooth.le/types_deprecated.fidl

Name	Type	Description	Default
uuid	fuchsia.bluetooth/UuidString		No default
data	vector<uint8>		No default

ENUMS

AdvertisingModeHint

Type: uint8

Defined in fuchsia.bluetooth.le/peripheral.fidl

A client can indicate the transmission rate of advertising packets by specifying a mode. The mode provides a hint to the system when configuring the controller with advertising interval and window parameters.

The mode affects how quickly a scanner or central is able to discover the peripheral; however it can have an adverse effect on power consumption. While the system will try to honor a client's request, it is not guaranteed to do so.

Name	Value	Description
VERY_FAST	1	Advertise with a very short interval and window for fast discovery at the cost of higher power consumption. This corresponds to a 30-60ms interval on the 1M PHYs and 90-180ms on the coded PHY.
FAST	2	Advertise with a short interval and window that uses less power than VERY_FAST. This corresponds to a 100-150ms interval on the 1M PHYs and 300-450ms on the coded PHY.
SLOW	3	Advertise with a moderate interval and window. This corresponds to 1-1.2s on the 1M PHYs and 3s on the coded PHY.

PeripheralError

Type: uint32

Defined in fuchsia.bluetooth.le/peripheral.fidl

Name	Value	Description
NOT_SUPPORTED	1	The operation or parameters requested are not supported on the current hardware.
ADVERTISING_DATA_TOO_LONG	2	The provided advertising data exceeds the maximum allowed length when encoded.
SCAN_RESPONSE_DATA_TOO_LONG	3	The provided scan response data exceeds the maximum allowed length when encoded.
INVALID_PARAMETERS	4	The requested parameters are invalid.
ABORTED	5	The request to start advertising was aborted, for example by issuing a new request with new parameters.
FAILED	6	Advertising could not be initiated due to a hardware or system error.

TABLES

AdvertisingData

Defined in fuchsia.bluetooth.le/advertising_data.fidl

Represents advertising and scan response data that are transmitted by a LE peripheral or broadcaster.

Ordinal	Name	Type	Description
1	name	fuchsia.bluetooth/DeviceName	Long or short name of the device.
2	appearance	fuchsia.bluetooth/Appearance	The appearance of the device.
3	tx_power_level	int8	The radio transmit power level reported by an advertising peer. This field is disallowed when used with the Peripheral API.
4	service_uuids	vector<fuchsia.bluetooth/Uuid>	Service UUIDs.
5	service_data	vector<ServiceData>	Service data entries.
6	manufacturer_data	vector<ManufacturerData>	Manufacturer-specific data entries.
7	uris	vector<string>	String representing a URI to be advertised, as defined in IETF STD 66. Each entry should be a UTF-8 string including the scheme. For more information, see: https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml for allowed schemes; https://www.bluetooth.com/specifications/assigned-numbers/uri-scheme-name-string-mapping for code-points used by the system to compress the scheme to save space in the payload.

AdvertisingParameters

Defined in fuchsia.bluetooth.le/peripheral.fidl

Represents the parameters for configuring advertisements.

Ordinal	Name	Type	Description
1	data	AdvertisingData	The fields that will be encoded in the data section of advertising packets. This field is required.
2	scan_response	AdvertisingData	The fields that are to be sent in a scan response packet. Clients may use this to send additional data that does not fit inside an advertising packet on platforms that do not support the advertising data length extensions. If present advertisements will be configured to be scannable.
3	mode_hint	AdvertisingModeHint	The desired advertising frequency. See AdvertisingModeHint. Defaults to AdvertisingModeHint.SLOW if not present.
4	connectable	bool	[[DEPRECATED]]: Prefer to use the ConnectionOptions field for new code. If present and true then the controller will broadcast connectable advertisements which allows remote LE centrals to initiate a connection to the Peripheral. If false or otherwise not present then the advertisements will be non-connectable.
5	connection_options	ConnectionOptions	If present, the controller will broadcast connectable advertisements which allow remote LE centrals to initiate connections to the Peripheral. The fields of ConnectionOptions will configure any connections set up from advertising.

ConnectionOptions

Defined in fuchsia.bluetooth.le/connection_options.fidl

Represents parameters that are set on a per-connection basis by FIDL protocols that create Low Energy connections.

Ordinal	Name	Type	Description
1	bondable_mode	bool	When true, the connection operates in bondable mode. This means pairing will form a bond, or persist across disconnections, if the peer is also in bondable mode. When not present, the connection defaults to bondable mode. When false, the connection operates in non- bondable mode, which means the local device only allows pairing that does not form a bond.
2	service_filter	fuchsia.bluetooth/Uuid	When present, service discovery performed following the connection is restricted to primary services that match this field. Otherwise, by default all available services are discovered.

Peer

Defined in fuchsia.bluetooth.le/peer.fidl

Represents a Bluetooth Low Energy peer that may act in the broadcaster, peripheral, or central role. The peer's role depends on whether it is obtained from the Central or Peripheral protocol.

Ordinal	Name	Type	Description
1	id	fuchsia.bluetooth/PeerId	Uniquely identifies this peer on the current system. This field is always present.
2	connectable	bool	Whether or not this peer is connectable. Non-connectable peers are typically in the LE broadcaster role. This field is always present.
3	rssi	int8	The last observed RSSI of this peer.
4	advertising_data	AdvertisingData	Advertising and scan response data broadcast by this peer. Present in broadcasters and peripherals.

UNIONS

Peripheral_StartAdvertising_Result

Defined in fuchsia.bluetooth.le/peripheral.fidl

Name	Type	Description
response	Peripheral_StartAdvertising_Response
err	PeripheralError

CONSTANTS

Name	Value	Type	Description
MAX_MANUFACTURER_DATA_LENGTH	252	uint8
MAX_SERVICE_DATA_LENGTH	252	uint8
MAX_URI_LENGTH	254	uint8