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|
Android HAL protocol for Bluetooth
==================================
The Android HAL daemon for Bluetooth functionality implements the Unix socket
server protocol around /run/bluetooth/daemon (tentative location) or Linux
abstract sockets (tentative name).
The daemon is single threaded and uses a mainloop for scheduling and general
operation.
The protocol is SOCK_SEQPACKET based and follows a strict PDU specification
with a generic header and initial registration exchange. The communication
is driven from the HAL with command/response exchanges. The daemon will use
notification to signal events. The protocol is single PDU exchanged based,
meaning every command requires a response. Notification does not require
any confirmation. Not handling this PDU exchange leads to a disconnection of
the socket.
Command/response and notification use separate sockets. First connected socket
is used for command/response, second for notification. All services are
multi-plexed over same pair of sockets. Separation is done to ease
implementation of simple HAL library with dedicated thread for handling
notification.
This strict protocol requirement is done to match C based callbacks and
callout functions that are running in a thread inside the HAL and might
block.
.--Android--. .--Android--.
| daemon | | HAL |
| | Command | |
| | <-------------------------- | |
| | | |
| | --------------------------> | |
| | Response | |
| | | |
| | | |
| | Notification | |
| | --------------------------> | |
| | | |
'-----------' '-----------'
Every packet will follow the basic header to support simple multi-plexing
over the same socket. It will also support a basic control channel with service
id 0.
0 8 16 24 31
+--------------+--------------+--------------+--------------+
| Service ID | Opcode | Data Length |
+--------------+--------------+-----------------------------+
| |
The unique service ID is assigned by this specification for each HAL.
As general rule of thumb, the opcode for command matches the opcode for a
response. Or the opcode 0x00 for an error is returned.
Notification opcodes start from 0x80.
All command/response opcodes have the least significant bit not set. And all
notifications have the least significant bit set.
The HAL modules only have the job to map the callback and event functions
to the protocol. They do not need to do anything else. Below is an example
of a sample transaction for the Bluetooth Core HAL and enabling of an
adapter.
HAL Daemon
----------------------------------------------------
call enable() --> command 0x01
return enable() <-- response 0x01
call adapter_state_changed() <-- notification 0x81
return adapter_state_changed()
When the Android hardware framework calls into the Bluetooth Core HAL
and executes the enable() callback, the HAL module sends the enable
command with opcode 0x01 to the daemon. As soon as the daemon responds,
the callback will return with the appropriate result.
After the daemon switched on the adapter, it will send a notification
with opcode 0x81 to the HAL module.
The Bluetooth Core HAL and Bluetooth Socket HAL are guaranteed to be
available from the daemon. All other HAL modules are optional.
When the Bluetooth Core HAL init() function is called, it should open
the socket and register both "bluetooth" and "socket" service modules. It is
required to register "socket" service at the same time since the HAL module
does not have its own init() function.
When new profiles are initiated, the get_profile_interface() callback
will load the profile and during init() of the profile, it should register the
specific service.
Bluetooth main thread Daemon
-------------------------------------------------------
init() --> open command socket
--> open notification socket
--> register module "bluetooth"
--> register module "socket"
get_profile_interface() --> return profile struct
--> continue on Handsfree thread
Handsfree thread Daemon
--------------------------------------------------------
init() --> register module handsfree
Core Service (ID 0)
===================
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 Failed
Opcode 0x01 - Register module command/response
Command parameters: Service id (1 octet)
Mode (1 octet)
Response parameters: <none>
In case a command is sent for an undeclared service ID, it will
be rejected. Also there will be no notifications for undeclared
service ID.
Valid Mode values: 0x00 = Default Mode
0xXX = as defined by service
In case of an error, the error response will be returned.
Opcode 0x02 - Unregister module command/response
Command parameters: Service id (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Bluetooth Core HAL (ID 1)
=========================
Android HAL name: "bluetooth" (BT_HARDWARE_MODULE_ID)
Service modes: 0x00 = Enable BR/EDR/LE if supported (default)
0x01 = Enable BR/EDR only
0x02 = Enable LE only
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Opcode 0x01 - Enable command/response
Command parameters: <none>
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x02 - Disable command/response
Command parameters: <none>
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x03 - Get Adapter Properties command/response
Command parameters: <none>
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x04 - Get Adapter Property command/response
Command parameters: Property type (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x05 - Set Adapter Property command/response
Command parameters: Property type (1 octet)
Property length (2 octets)
Property value (variable)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x06 - Get Remote Device Properties command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x07 - Get Remote Device Property command/response
Command parameters: Remote address (6 octets)
Property type (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x08 - Set Remote Device Property command/response
Command parameters: Remote address (6 octets)
Property type (1 octet)
Property length (2 octets)
Property value (variable)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x09 - Get Remote Service Record command/response
Command parameters: Remote address (6 octets)
UUID (16 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0a - Get Remote Services command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0b - Start Discovery command/response
Command parameters: <none>
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0c - Cancel Discovery command/response
Command parameters: <none>
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0d - Create Bond command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0e - Remove Bond command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0f - Cancel Bond command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x10 - PIN Reply command/response
Command parameters: Remote address (6 octets)
Accept (1 octet)
PIN length (1 octet)
PIN code (16 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x11 - SSP Reply command/response
Command parameters: Remote address (6 octets)
SSP variant (1 octet)
Accept (1 octet)
Passkey (4 octets)
Response parameters: <none>
Valid SSP variant values: 0x00 = Passkey Confirmation
0x01 = Passkey Entry
0x02 = Consent (for Just Works)
0x03 = Passkey Notification
In case of an error, the error response will be returned.
Opcode 0x12 - DUT Mode Configure command/response
Command parameters: Enable (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x13 - DUT Mode Send command/response
Command parameters: Opcode (2 octets)
Length (1 octet)
Data (variable)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x14 - LE Test Mode command/response
Command parameters: Opcode (2 octets)
Length (1 octet)
Data (variable)
Response parameters: <none>
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Adapter State Changed notification
Notifications parameters: State (1 octet)
Valid state values: 0x00 = Off
0x01 = On
Opcode 0x82 - Adapter Properties Changed notification
Notification parameters: Status (1 octet)
Num properties (1 octet)
Type # (1 octet)
Length # (2 octets)
Value # (variable)
...
Opcode 0x83 - Remote Device Properties notification
Notification parameters: Status (1 octet)
Remote address (6 octets)
Num properties (1 octet)
Type # (1 octet)
Length # (2 octets)
Value # (variable)
...
Opcode 0x84 - Device Found notification
Notification parameters: Num properties (1 octet)
Type # (1 octet)
Length # (2 octets)
Value # (variable)
...
Opcode 0x85 - Discovery State Changed notification
Notifications parameters: State (1 octet)
Opcode 0x86 - PIN Request notification
Notification parameters: Remote address (6 octets)
Remote name (249 octets)
Class of device (4 octets)
Opcode 0x87 - SSP Request notification
Notification parameters: Remote address (6 octets)
Remote name (249 octets)
Class of device (4 octets)
Pairing variant (1 octet)
Passkey (4 octets)
Opcode 0x88 - Bond State Changed notification
Notification parameters: Status (1 octet)
Remote address (6 octets)
Bond state (1 octet)
Valid bond state values: 0x00 = None
0x01 = Bonding
0x02 = Bonded
Opcode 0x89 - ACL State Changed notification
Notification parameters: Status (1 octet)
Remote address (6 octets)
ACL state (1 octet)
Opcode 0x8a - DUT Mode Receive notification
Notification parameters: Opcode (2 octets)
Length (1 octet)
Data (variable)
Opcode 0x8b - LE Test Mode notification
Notification parameters: Status (1 octet)
Num packets (2 octets)
Bluetooth Socket HAL (ID 2)
===========================
Android HAL name:: "socket" (BT_PROFILE_SOCKETS_ID)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Listen command/response
Command parameters: Socket type (1 octet)
Service name (256 octets)
Service UUID (16 octets)
Channel (2 octets)
Socket flags (1 octet)
Response parameters: File descriptor (inline)
Valid socket types: 0x01 = RFCOMM
0x02 = SCO
0x03 = L2CAP
Valid socket flags: 0x01 = Encrypt
0x02 = Auth
In case of an error, the error response will be returned.
Opcode 0x02 - Connect command/response
Command parameters: Remote address (6 octets)
Socket type (1 octet)
Service UUID (16 octets)
Channel (2 octets)
Socket flags (1 octet)
Response parameters: File descriptor (inline)
Valid socket types: 0x01 = RFCOMM
0x02 = SCO
0x03 = L2CAP
Valid socket flags: 0x01 = Encrypt
0x02 = Auth
In case of an error, the error response will be returned.
Bluetooth HID Host HAL (ID 3)
============================
Android HAL name: "hidhost" (BT_PROFILE_HIDHOST_ID)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Connect command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x02 - Disconnect command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x03 - Virtual Unplug command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x04 - Set Info command/response
Command parameters: Remote address (6 octets)
Attribute mask (2 octets)
Subclass (1 octet)
Application ID (1 octet)
Vendor ID (2 octets)
Product ID (2 octets)
Version (2 octets)
Country code (1 octet)
Descriptor length (2 octet)
Descriptor value (884 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x05 - Get Protocol command/response
Command parameters: Remote address (6 octets)
Protocol mode (1 octet)
Response parameters: <none>
Valid protocol modes: 0x00 = Report
0x01 = Boot
0xff = Unsupported
In case of an error, the error response will be returned.
Opcode 0x06 - Set Protocol command/response
Command parameters: Remote address (6 octets)
Protocol mode (1 octet)
Response parameters: <none>
Valid protocol modes: 0x00 = Report
0x01 = Boot
0xff = Unsupported
In case of an error, the error response will be returned.
Opcode 0x07 - Get Report command/response
Command parameters: Remote address (6 octets)
Report type (1 octet)
Report ID (1 octet)
Buffer size (2 octet)
Response parameters: <none>
Valid report types: 0x01 = Input
0x02 = Output
0x03 = Feature
In case of an error, the error response will be returned.
Opcode 0x08 - Set Report command/response
Command parameters: Remote address (6 octets)
Report type (1 octet)
Report length (2 octets)
Report data (Report length)
Response parameters: <none>
Valid report types: 0x01 = Input
0x02 = Output
0x03 = Feature
In case of an error, the error response will be returned.
Opcode 0x09 - Send Data command/response
Command parameters: Remote address (6 octets)
Data length (2 octets)
Data (Data length)
Response parameters: <none>
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Connection State notification
Notification parameters: Remote address (6 octets)
Connection State (1 octets)
Valid connection states: 0x00 = Connected
0x01 = Connecting
0x02 = Disconnected
0x03 = Disconnecting
0x04 = Failed - Mouse from host
0x05 = Failed - Keyboard from host
0x06 = Failed - Too many devices
0x07 = Failed - No HID driver
0x08 = Failed - generic
0x09 = Unknown
Opcode 0x82 - HID Info notification
Notification parameters: Remote address (6 octets)
Attribute mask (2 octets)
Subclass (1 octet)
Application ID (1 octet)
Vendor ID (2 octets)
Product ID (2 octets)
Version (2 octets)
Country code (1 octet)
Descriptor length (2 octet)
Descriptor value (884 octets)
Opcode 0x83 - Protocol Mode notification
Notification parameters: Remote address (6 octets)
Status (1 octet)
Protocol mode (1 octet)
Valid protocol modes: 0x00 = Report
0x01 = Boot
0xff = Unsupported
Opcode 0x84 - Idle Time notification
Notification parameters: Remote address (6 octets)
Status (1 octet)
Idle time (2 octets)
Opcode 0x85 - Get Report notification
Notification parameters: Remote address (6 octets)
Status (1 octet)
Report length (2 octets)
Report data (variable)
Opcode 0x86 - Virtual Unplug notification
Notification parameters: Remote address (6 octets)
Status (1 octet)
Valid status values: 0x00 = Ok
0x01 = Handshake - Device not ready
0x02 = Handshake - Invalid report ID
0x03 = Handshake - Transaction not SPT
0x04 = Handshake - Invalid parameter
0x05 = Handshake - Generic error
0x06 = General error
0x07 = SDP error
0x08 = Set protocol error
0x09 = Device database full
0x0a = Device type not supported
0x0b = No resources
0x0c = Authentication failed
0x0d = HDL
Bluetooth PAN HAL (ID 4)
========================
Android HAL name: "pan" (BT_PROFILE_PAN_ID)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Enable command/response
Command parameters: Local role (1 octet)
Response parameters: <none>
Valid role values: 0x00 = None
0x01 = NAP
0x02 = PANU
In case of an error, the error response will be returned.
Opcode 0x02 - Get Local Role command/response
Command parameters: <none>
Response parameters: Local role (1 octet)
Valid role values: 0x00 = None
0x01 = NAP
0x02 = PANU
In case of an error, the error response will be returned.
Opcode 0x03 - Connect command/response
Command parameters: Remote address (6 octets)
Local role (1 octet)
Remote role (1 octet)
Response parameters: <none>
Valid role values: 0x01 = NAP
0x02 = PANU
In case of an error, the error response will be returned.
Opcode 0x04 - Disconnect command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Control State notification
Notification parameters: Control state (1 octet)
Status (1 octet)
Local role (1 octet)
Interface name (17 octet)
Valid control states: 0x00 = Enabled
0x01 = Disabled
Valid role values: 0x00 = None
0x01 = NAP
0x02 = PANU
Opcode 0x82 - Connection State notification
Notification parameters: Connection state (1 octet)
Status (1 octet)
Remote address (6 octets)
Local role (1 octet)
Remote role (1 octet)
Valid connection states: 0x00 = Connected
0x01 = Connecting
0x02 = Disconnected
0x03 = Disconnecting
Valid role values: 0x01 = NAP
0x02 = PANU
Bluetooth Handsfree HAL (ID 5)
==============================
Android HAL name: "handsfree" (BT_PROFILE_HANDSFREE_ID)
Service modes: 0x00 = Headset Profile only mode (default)
0x01 = Handsfree Profile (narrowband speech)
0x02 = Handsfree Profile (narrowband and wideband speech)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Connect command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x02 - Disconnect command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x03 - Connect Audio command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x04 - Disconnect Audio command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x05 - Start Voice Recognition command/response
Command parameters: <none>
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x06 - Stop Voice Recognition command/response
Command parameters: <none>
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x07 - Volume Control command/response
Command parameters: Volume type (1 octet)
Volume (1 octet)
Response parameters: <none>
Valid volume types: 0x00 = Speaker
0x01 = Microphone
In case of an error, the error response will be returned.
Opcode 0x08 - Device Status Notification command/response
Command parameters: Network state (1 octet)
Service type (1 octet)
Signal strength (1 octet)
Battery level (1 octet)
Response parameters: <none>
Valid network states: 0x00 = Not available
0x01 = Available
Valid service types: 0x00 = Home network
0x01 = Roaming network
In case of an error, the error response will be returned.
Opcode 0x09 - COPS Response command/response
Command parameters: COPS command response (string)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0a - CIND Response command/response
Command parameters: Service (1 octet)
Number of active calls (1 octet)
Number of held calls (1 octet)
Call setup state (1 octet)
Signal strength (1 octet)
Roaming indicator (1 octet)
Battery level (1 octet)
Response parameters: <none>
Valid call setup states: 0x00 = Active
0x01 = Held
0x02 = Dialing
0x03 = Alerting
0x04 = Incoming
0x05 = Waiting
0x06 = Idle
In case of an error, the error response will be returned.
Opcode 0x0b - Formatted AT Response command/response
Command parameters: Pre-formatted AT response (string)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0c - AT Response command/response
Command parameters: Response code (1 octet)
Error code (1 octet)
Response parameters: <none>
Valid response codes: 0x00 = ERROR
0x01 = OK
In case of an error, the error response will be returned.
Opcode 0x0d - CLCC Response command/response
Command parameters: Call index (1 octet)
Call direction (1 octet)
Call state (1 octet)
Call mode (1 octet)
Call multiparty type (1 octet)
Call number type (1 octet)
Call number (string)
Response parameters: <none>
Valid call directions: 0x00 = Outgoing
0x01 = Incoming
Valid call states: 0x00 = Active
0x01 = Held
0x02 = Dialing
0x03 = Alerting
0x04 = Incoming
0x05 = Waiting
0x06 = Idle
Valid call modes: 0x00 = Voice
0x01 = Data
0x02 = Fax
Valid multiparty types: 0x00 = Single call
0x01 = Multiparty call
Valid number types: 0x81 = Unknown
0x91 = International
In case of an error, the error response will be returned.
Opcode 0x0e - Phone Status Change command/response
Command parameters: Number of active calls (1 octet)
Number of held calls (1 octet)
Call setup state (1 octet)
Call number type (1 octet)
Call number (string)
Response parameters: <none>
Valid call setup states: 0x00 = Active
0x01 = Held
0x02 = Dialing
0x03 = Alerting
0x04 = Incoming
0x05 = Waiting
0x06 = Idle
Valid number types: 0x81 = Unknown
0x91 = International
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Connection State notification
Notification parameters: Connection state (1 octet)
Remote address (6 octets)
Valid connection states: 0x00 = Disconnected
0x01 = Connecting
0x02 = Connected
0x03 = SLC connected
0x04 = Disconnecting
Opcode 0x82 - Audio State notification
Notification parameters: Audio state (1 octet)
Remote address (6 octets)
Valid audio states: 0x00 = Disconnected
0x01 = Connecting
0x02 = Connected
0x03 = Disconnecting
Opcode 0x83 - Voice Recognition Command notification
Notification parameters: Voice recognition state (1 octet)
Valid voice recognition states: 0x00 = Stopped
0x01 = Started
Opcode 0x84 - Answer Call Command notification
Notification parameters: <none>
Opcode 0x85 - Hangup Call Command notification
Notification parameters: <none>
Opcode 0x86 - Volume Command notification
Notification parameters: Volume type (1 octet)
Volume (1 octet)
Valid volume types: 0x00 = Speaker
0x01 = Microphone
Opcode 0x87 - Dial Call Command notification
Notification parameters: Number (string)
Opcode 0x88 - DTMF Command notification
Notification parameters: Tone (1 octet)
Opcode 0x89 - NREC Command notification
Notification parameters: NREC types (1 octet)
Valid NREC types: 0x00 = Stop
0x01 = Start
Opcode 0x8a - CHLD Command notification
Notification parameters: NREC types (1 octet)
Valid CHLD types: 0x00 = Release and hold
0x01 = Release active and accept held
0x02 = Hold active and accept held
0x03 = Add held call to conference
Opcode 0x8b - CNUM Command notification
Notification parameters: <none>
Opcode 0x8c - CIND Command notification
Notification parameters: <none>
Opcode 0x8d - COPS Command notification
Notification parameters: <none>
Opcode 0x8e - CLCC Command notification
Notification parameters: <none>
Opcode 0x8f - Unknown AT Command notification
Notification parameters: AT command (string)
Opcode 0x90 - Key Pressed Command notification
Notification parameters: <none>
Bluetooth Advanced Audio HAL (ID 6)
===================================
Android HAL name: "a2dp" (BT_PROFILE_ADVANCED_AUDIO_ID)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Connect command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x02 - Disconnect command/response
Command parameters: Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Connection State notification
Notification parameters: Connection state (1 octet)
Remote address (6 octets)
Valid connection states: 0x00 = Disconnected
0x01 = Connecting
0x02 = Connected
0x03 = Disconnecting
Opcode 0x82 - Audio State notification
Notification parameters: Audio state (1 octet)
Remote address (6 octets)
Valid connection states: 0x00 = Remote suspend
0x01 = Stopped
0x02 = Started
Bluetooth Health HAL (ID 7)
===========================
Android HAL name: "health" (BT_PROFILE_HEALTH_ID)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Register Application command/response
Command parameters: Number of MDEP (1 octet)
Application name offset (2 octets)
Provider name offset (2 octets)
Service name offset (2 octets)
Service description offset (2 octets)
Data length (2 octets)
Data (data length)
Response parameters: Application ID (2 octets)
Strings are null terminated.
In case of an error, the error response will be returned.
Opcode 0x02 - Register Application MDEP data command/response
Command parameters: Application ID (2 octets)
MDEP Role (1 octet)
Data type (2 octets)
Channel type (1 octet)
MDEP description length (2 octets)
MDEP description (MDEP desciption length)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x03 - Unregister Application command/response
Command parameters: Application ID (2 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x04 - Connect Channel command/response
Command parameters: Application ID (2 octets)
Remote address (6 octets)
MDEP index (1 octet)
Response parameters: Channel ID (2 octets)
In case of an error, the error response will be returned.
Opcode 0x05 - Destroy Channel command/response
Command parameters: Channel ID (2 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Application Registration State notification
Notification parameters: Application ID (2 octets)
Application state (1 octet)
Valid application states: 0x00 = Registration success
0x01 = Registration failed
0x02 = Deregistration success
0x03 = Deregistration failed
Opcode 0x82 - Channel State notification
Notification parameters: Application ID (2 octets)
Remote address (6 octets)
MDEP index (1 octet)
Channel ID (2 octets)
Channel state (1 octet)
File descriptor (inline)
Valid channel states: 0x00 = Connecting
0x01 = Connected
0x02 = Disconnecting
0x03 = Disconnected
0x04 = Destroyed
Bluetooth Remote Control HAL (ID 8)
===================================
Android HAL name: "avrcp" (BT_PROFILE_AV_RC_ID)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Get Play Status Response command/response
Command parameters: Status (1 octet)
Duration (4 octets)
Position (4 octets)
In case of an error, the error response will be returned.
Valid status values: 0x00 = Stopped
0x01 = Playing
0x02 = Paused
0x03 = Fwd seek
0x04 = Rev seek
0xff = Error
Opcode 0x02 - List Player Attributes Response command/response
Command parameters: Number of attributes (1 octet)
Attribute # (1 octet)
...
In case of an error, the error response will be returned.
Valid attributes: 0x01 = Equalizer
0x02 = Repead
0x03 = Shuffle
0x04 = Scan
Opcode 0x03 - List Player Values Response command/response
Command parameters: Number of values (1 octet)
Value # (1 octet)
...
In case of an error, the error response will be returned.
Opcode 0x04 - Get Player Values Response command/response
Command parameters: Number of attributes (1 octet)
Attribute # (1 octet)
Value # (1 octet)
...
In case of an error, the error response will be returned.
Valid attributes: Same as in List Player Attributes
Opcode 0x05 - Get Player Attributes Text Response command/response
Command parameters: Number of attributes (1 octet)
Attribute # (1 octet)
Attribute # text length (1 octet)
Attribute # text (variable)
...
In case of an error, the error response will be returned.
Valid attributes: Same as in List Player Attributes
Opcode 0x06 - Get Player Values Text Response command/response
Command parameters: Number of values (1 octet)
Value # (1 octet)
Value # text length (1 octet)
Value # text (variable)
...
In case of an error, the error response will be returned.
Opcode 0x07 - Get Element Attributes Text Response command/response
Command parameters: Number of elements (1 octet)
Element # (1 octet)
Element # text length (1 octet)
Element # text (variable)
...
In case of an error, the error response will be returned.
Valid elements: 0x01 = Title
0x02 = Artist
0x03 = Album
0x04 = Track Number
0x05 = Number of Tracks
0x06 = Genre
0x06 = Duration
Opcode 0x08 - Set Player Attributes Value Response command/response
Command parameters: Status (1 octet)
In case of an error, the error response will be returned.
Valid status values: Same as in Get Play Status Response
Opcode 0x09 - Register Notification Response command/response
Command parameters: Event (1 octet)
Type (1 octet)
Data length (1 octet)
Data (variable)
In case of an error, the error response will be returned.
Valid event values: 0x01 = Status Changed
0x02 = Track Changed
0x03 = Track Reached End
0x04 = Track Reached Start
0x05 = Position Changed
0x08 = Setting Changed
Valid type values : 0x00 = Interim
0x01 = Changed
Opcode 0x0a - Set Volume command/response
Command parameters: Value (1 octet)
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Remote Features notification
Notification parameters: Remote address (6 octets)
Features (1 octet)
Valid features values : 0x00 = None
0x01 = Metadata
0x02 = Absolute Volume
0x03 = Browse
Opcode 0x82 - Get Play Status notification
Notification parameters: <none>
Opcode 0x83 - List Player Attributes notification
Notification parameters: <none>
Opcode 0x84 - List Player Values notification
Notification parameters: Attribute (1 octet)
Valid attribute values: Same as in List Player Attributes
Opcode 0x85 - Get Player Values notification
Notification parameters: Number of attributes (1 octet)
Attribute # (1 octet)
...
Valid attribute values: Same as in List Player Attributes
Opcode 0x86 - Get Player Attributes Text notification
Notification parameters: Number of attributes (1 octet)
Attribute # (1 octet)
...
Valid attribute values: Same as in List Player Attributes
Opcode 0x87 - Get Player Values Text notification
Notification parameters: Attribute (1 octet)
Number of values (1 octet)
Value # (1 octet)
...
Valid attribute values: Same as in List Player Attributes
Opcode 0x88 - Set Player Values notification
Notification parameters: Number of attributes (1 octet)
Attribute # (1 octet)
Value # (1 octet)
...
Valid attribute values: Same as in List Player Attributes
Opcode 0x89 - Get Element Attributes notification
Notification parameters: Number of attributes (1 octet)
Attribute # (1 octet)
...
Valid attribute values: Same as in Get Element Attribute
Opcode 0x8a - Register Notification notification
Notification parameters: Event (1 octet)
Parameter (4 octets)
Valid event values: Same as in Register Notification
Opcode 0x8b - Volume Changed notification
Notification parameters: Volume (1 octet)
Type (1 octet)
Valid type values: Same as in Register Notification
Opcode 0x8c - Passthrough Command notification
Notification parameters: ID (1 octet)
State (1 octet)
Bluetooth GATT HAL (ID 9)
=========================
Android HAL name: "gatt" (BT_PROFILE_GATT_ID)
Structures:
GATT Service ID: UUID (16 octets)
Instance ID (1 octet)
Is Primary (1 octet)
GATT Included Service ID: UUID (16 octets)
Instance ID (1 octet)
Is Primary (1 octet)
GATT Characteristic ID: UUID (16 octets)
Instance ID (1 octet)
GATT Descriptor ID: UUID (16 octets)
Instance ID (1 octet)
Commands and responses:
Opcode 0x00 - Error response
Response parameters: Status (1 octet)
Valid status values: 0x01 = Fail
0x02 = Not ready
0x03 = No memory
0x04 = Busy
0x05 = Done (already completed)
0x06 = Unsupported
0x07 = Parameter invalid
0x08 = Unhandled
0x09 = Authentication failure
0x0a = Remote device down
Opcode 0x01 - Register Client command/response
Command parameters: Service UUID (16 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x02 - Unregister Client command/response
Command parameters: Client Interface (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x03 - Scan command/response
Command parameters: Client Interface (4 octets)
Start (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x04 - Connect Device command/response
Command parameters: Client Interface (4 octets)
Remote address (6 octets)
Is Direct (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x05 - Disconnect Device command/response
Command parameters: Client Interface (4 octets)
Remote address (6 octets)
Connection ID (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x06 - Listen command/response
Command parameters: Client Interface (4 octets)
Start (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x07 - Refresh command/response
Command parameters: Client Interface (4 octets)
Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x08 - Search Service command/response
Command parameters: Connection ID (4 octets)
Filtered (1 octet)
Filter UUID (16 octets)
Response parameters: <none>
Filter UUID shall only be present when Filtered is non-zero.
In case of an error, the error response will be returned.
Opcode 0x09 - Get Included Service command/response
Command parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
Continuation (1 octet)
GATT Included Service ID (18 octets)
...
Response parameters: <none>
GATT Included Service ID shall only be present when Continuation is non-zero.
In case of an error, the error response will be returned.
Opcode 0x0a - Get Characteristic command/response
Command parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
Continuation (1 octet)
GATT Characteristic ID (17 octets)
...
Response parameters: <none>
GATT Characteristic ID shall only be present when Continuation is non-zero.
In case of an error, the error response will be returned.
Opcode 0x0b - Get Descriptor command/response
Command parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Continuation (1 octet)
GATT Descriptor ID (17 octets)
...
Response parameters: <none>
GATT Descriptor ID shall only be present when Continuation is non-zero.
In case of an error, the error response will be returned.
Opcode 0x0c - Read Characteristic command/response
Command parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Authorization (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0d - Write Characteristic command/response
Command parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Write Type (4 octets)
Length (4 octets)
Authorization Req. (4 octets)
Value (variable)
Response parameters: <none>
Valid Write Type: 0x01 = No response
0x02 = Default
0x03 = Prepare
0x04 = Signed
In case of an error, the error response will be returned.
Opcode 0x0e - Read Descriptor command/response
Command parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
GATT Descriptor ID (17 octets)
Authorization Req. (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x0f - Write Descriptor command/response
Command parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
GATT Descriptor ID (17 octets)
Write Type (4 octets)
Length (4 octets)
Authorization Req. (4 octets)
Value (variable)
Response parameters: <none>
Valid Write Type: 0x01 = No response
0x02 = Default
0x03 = Prepare
0x04 = Signed
In case of an error, the error response will be returned.
Opcode 0x10 - Execute Write command/response
Command parameters: Connection ID (4 octets)
Execute (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x11 - Register For Notification command/response
Command parameters: Client Interface (4 octets)
Remote address (6 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x12 - Deregister For Notification command/response
Command parameters: Client Interface (4 octets)
Remote address (6 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x13 - Read Remote RSSI command/response
Command parameters: Client Interface (4 octets)
Remote address (6 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x14 - Get Device Type command/response
Command parameters: Remote address (6 octets)
Response parameters: Device Type
Valid Device Type: 0x01 = BREDR
0x02 = BLE
0x03 = DUAL
In case of an error, the error response will be returned.
Opcode 0x15 - Set Advertising data command/response
Command parameters: Server Interface (4 octets)
Set Scan Resp. (1 octet)
Include Name (1 octet)
Include TX Power (1 octet)
Min. Interval (4 octets)
Max. Interval (4 octets)
Appearance (4 octets)
Manufacturer Len. (2 octets)
Manufacturer Data (variable)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x16 - Test Command command/response
Command parameters: Command (4 octets)
Address (6 octets)
UUID (16 octets)
U1 (2 octets)
U2 (2 octets)
U3 (2 octets)
U4 (2 octets)
U5 (2 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x17 - Register Server command/response
Command parameters: UUID (16 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x18 - Unregister Server command/response
Command parameters: Server (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x19 - Connect Peripheral command/response
Command parameters: Server (4 octets)
Remote address (6 octes)
Is Direct (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x1a - Disconnect Peripheral command/response
Command parameters: Server (4 octets)
Remote address (6 octes)
Connection ID (1 octet)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x1b - Add Service command/response
Command parameters: Server (4 octets)
GATT Service ID (18 octets)
Number of Handles (4 octet)
Response parameters: <none>
Valid GATT Service ID: UUID (16 octets)
Instance ID (1 octet)
Is Primary (1 octet)
In case of an error, the error response will be returned.
Opcode 0x1c - Add Included Service command/response
Command parameters: Server (4 octets)
Service handle (4 octets)
Included handle (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x1d - Add Characteristic command/response
Command parameters: Server (4 octets)
Service handle (4 octets)
UUID (16 octets)
Properties (4 octets)
Permissions (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x1e - Add Descriptor command/response
Command parameters: Server (4 octets)
Service handle (4 octets)
UUID (16 octets)
Permissions (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x1f - Start Service command/response
Command parameters: Server (4 octets)
Service handle (4 octets)
Transport (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x20 - Stop Service command/response
Command parameters: Server (4 octets)
Service handle (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x21 - Delete Service command/response
Command parameters: Server (4 octets)
Service handle (4 octets)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x22 - Send Indication command/response
Command parameters: Server (4 octets)
Attribute handle (4 octets)
Connection ID (4 octets)
Length (4 octets)
Confirmation (4 octets)
Value (variable)
Response parameters: <none>
In case of an error, the error response will be returned.
Opcode 0x23 - Send Response command/response
Command parameters: Connection ID (4 octets)
Transaction ID (4 octets)
Handle (2 octets)
Offset (2 octets)
Auth Request (1 octect)
Status (4 octets)
GATT Response (4 octets)
Response parameters: <none>
Valid GATT Response: GATT Value (607 octets)
Handle (2 octets)
Valid GATT Value: Value (600 octets)
Handle (2 octets)
Offset (2 octets)
Length (2 octets)
Authentication Request (1 octet)
In case of an error, the error response will be returned.
Notifications:
Opcode 0x81 - Register Client notification
Notification parameters: Status (4 octets)
Client Interface (4 octets)
UUID (16 octets)
Opcode 0x82 - Scan Result notification
Notification parameters: Address (6 octets)
RSSI (4 octets)
Length (2 octets)
Data (variable)
Opcode 0x83 - Connect Device notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
Client Interface (4 octets)
Address (6 octets)
Opcode 0x84 - Disconnect Device notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
Client Interface (4 octets)
Address (6 octets)
Opcode 0x85 - Search Complete notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
Opcode 0x86 - Search Result notification
Notification parameters: Connection ID (4 octets)
GATT Service ID (18 octets)
Opcode 0x87 - Get Characteristic notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Char Prop. (4 octets)
Opcode 0x88 - Get Descriptor notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
GATT Descriptor ID (17 octets)
Opcode 0x89 - Get Included Service notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
GATT Service ID (18 octets)
GATT Included Service ID (18 octets)
Opcode 0x8a - Register For Notification notification
Notification parameters: Connection ID (4 octets)
Registered (4 octets)
Status (4 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Opcode 0x8b - Notify notification
Notification parameters: Connection ID (4 octets)
Address (6 octets)
GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
Is Notify (1 octet)
Length (2 octets)
Value (variable)
Opcode 0x8c - Read Characteristic notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
GATT Read Parameters (variable)
Valid GATT Read Parameters: GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
GATT Descriptor ID (17 octets)
Value Type (4 octets)
Status (1 octet)
Length (2 octets)
Value (variable)
Opcode 0x8d - Write Characteristic notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
GATT Write Parameters (53 octets)
Valid GATT Write Parameters: GATT Service ID (18 octets)
GATT Characteristic ID (17 octets)
GATT Description ID (17 octets)
Status (1 octet)
Opcode 0x8e - Read Descriptor notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
GATT Read Parameters (variable)
Valid GATT Read Parameters: As described in Read Characteristic
Opcode 0x8f - Write Descriptor notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
GATT Write Parameters (53 octets)
Valid GATT Write Parameters: As described in Write Characteristic
Opcode 0x90 - Execute Write notification
Notification parameters: Connection ID (4 octets)
Status (4 octets)
Opcode 0x91 - Read Remote RSSI notification
Notification parameters: Client (4 octets)
Address (6 octets)
RSSI (4 octets)
Status (4 octets)
Opcode 0x92 - Listen notification
Notification parameters: Status (4 octets)
Server Interface (4 octets)
Opcode 0x93 - Register Server notification
Notification parameters: Status (4 octets)
Server (4 octets)
UUID (16 octets)
Opcode 0x94 - Connection notification
Notification parameters: Connection ID (4 octets)
Server (4 octets)
Connected (4 octets)
Address (6 octets)
Opcode 0x95 - Service Added notification
Notification parameters: Status (4 octets)
Server (4 octets)
GATT Service ID (18 octets)
Service Handle (4 octets)
Opcode 0x96 - Included Service Added notification
Notification patemeters: Status (4 octets)
Server (4 octets)
Service Handle (4 octets)
Included Service Handle (4 octets)
Opcode 0x97 - Characteristic Added notification
Notification parameters: Status (4 octets)
Server (4 octets)
UUID (16 octets)
Service Handle (4 octets)
Characteristic Handle (4 octets)
Opcode 0x98 - Descriptor Added notification
Notification parameters: Status (4 octets)
Server (4 octets)
UUID (6 octets)
Service Handle (4 octets)
Descriptor Handle (4 octets)
Opcode 0x99 - Service Started notification
Notification parameters: Status (4 octets)
Server (4 octets)
Service Handle (4 octets)
Opcode 0x9a - Service Stopped notification
Notification parameters: Status (4 octets)
Server (4 octets)
Service Handle (4 octets)
Opcode 0x9b - Service Deleted notification
Notification parameters: Status (4 octets)
Server (4 octets)
Service Handle (4 octets)
Opcode 0x9c - Request Read notification
Notification parameters: Connection ID (4 octets)
Trans ID (4 octets)
Address (6 octets)
Attribute Handle (4 octets)
Offset (4 octets)
Is Long (1 octet)
Opcode 0x9d - Request Write notification
Notification parameters: Connection ID (4 octets)
Trans ID (4 octets)
Address (6 octets)
Attribute Handle (4 octets)
Offset (4 octets)
Length (4 octets)
Need Response (4 octets)
Is Prepare (1 octet)
Value (variable)
Opcode 0x9e - Request Execute Write notification
Notification parameters: Connection ID (4 octets)
Trans ID (4 octets)
Address (6 octets)
Execute Write (4 octets)
Opcode 0x9f - Response Confirmation notification
Notification parameters: Status (4 octets)
Handle (4 octets)
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