When is pair coming to android

This comes as the Apple-owned brand continues to release new products, including a just-leaked pair of Beats Studio truly wireless in-ear buds, and suggests a significant Android user base to warrant supporting Fast Pair. Given that vehicles today have vastly different infotainment systems, quickly connecting your phone for music and hands-free calling can often be confusing.

Like with headphones, a sheet will slide up from the bottom of your phone if Bluetooth is already enabled in the car. This simplified set-up process works for both Bluetooth streaming and wireless Android Auto. FTC: We use income earning auto affiliate links. The Provider is usually not in pairing mode. But this is not a requirement—The Provider should support using an account key even when in pairing mode.

The Seeker and Provider each verify that the other is in possession of the account key. Data Format See Procedure for how each format is used. Octet Data type Description Value Mandatory? Bit 2: 1 if the Seeker requests that the Provider shall notify the existing name.

Bit 3: 1 if this is for Retroactively writing account key. Bits 4 - 7 are reserved for future use, and shall be ignored. Bit 1: 1 if it will be followed by Additional Data characteristic , 0 otherwise. Bit 2 - 7 are reserved for future use, and shall be ignored. When handling a write request from a Fast Pair Seeker, the Fast Pair Provider shall do the following: If the optional Public Key field is present: If the device is not in pairing mode, ignore the write and exit.

Take the first bits of the result. Otherwise, try each key in the persisted Account Key List. If a key successfully decrypts the value, break, and continue to the next step. The value is decrypted successfully if the output matches the format in Table 1. Note that at the end of the packet there is a salt attached. When possible, these salts should be tracked, and if the Provider receives a request containing an already used salt, the request should be ignored to prevent replay attacks.

If no key could successfully decrypt the value, ignore the write and exit. Keep a count of these failures. When the failure count hits 10, fail all new requests immediately. Reset the failure count after 5 minutes, after power on, or after a success. Reason this is needed: Having the Provider initiate works around an issue on some devices. If none is received, exit.

We will re-verify during pairing that the requesting device is in possession of K. We rely on this to confirm that the requesting device is in fact the Fast Pair Seeker, and that there is no man-in-the-middle. See examples. Reason this is needed: The Out-of-Band pairing method would be a better fit, but the platform does not expose it on all desired versions of Android.

Instead, only for this pairing, we transfer them over BLE, encrypted with the trusted pre-shared key. Note that this approach should not be taken for devices that have a screen or a keyboard as it makes a slight compromise on MITM protection.

Fast Pair currently does not support those device types yet because of this. If the 10 second timer expires with a passkey being written, then discard K. If decryption fails, ignore the write and discard K.

Note: Do not reuse the salt from the Passkey Block received from the Seeker. Generate a new random value. If the pairing succeeds, then mark K as usable for decrypting Account Key writes on this LE link, but not for any subsequent Passkey writes nor any writes on any other link. Start a timer to discard K after 10 seconds. Also discard K following any attempt to write an Account Key and, as per step 4, if the LE link disconnects. If the pairing fails, discard K.

Examples Example 1: Successful pairing attempt no man-in-the-middle. Example 2: Failed pairing attempt, with a man-in-the-middle. Characteristic: Passkey This characteristic is used during the Key-based Pairing procedure. See Key-based Pairing procedure for usage. Octet Data type Description Value 0 - 15 uint Account key encrypted varies Upon getting a write request, the Fast Pair Provider shall do the following: Decrypt the account key using the shared secret generated from step 4 in the above procedure.

Before decrypting, verify that the shared secret was used to decrypt the passkey request from step If this step has not passed using this secret, ignore this write and quit. At this point, the shared secret K in the procedure above will not be used again for this pairing. Any requests which come in encrypted with this key without restarting the procedure above should be rejected. Verify that the decrypted value starts with 0x If it does not, ignore this write and quit. Check whether the persisted Account Key list has space for the new value.

If not, delete the least recently used value from the list. Add the new value to the list. Account Keys in the list are used during Key-based Pairing. Characteristic: Firmware Revision This characteristic allows the Seeker to read the firmware revision of the Provider as needed. It should always return the following data: Octet Data type Description Value 0 - var utf8s Firmware revision code varies It should be encapsulated to a single utf8 string even if there is more than one firmware e.

The Provider can also return the specific strings for special cases: status-updating : if the Provider is currently updating to a new firmware. Extensions Battery Notification It is optional for tethered headphones.

Optional To prevent tampering, the Account Key Data above shall be slightly modified to include battery information when the battery values are included in the advertisement.

Instead, when battery information is also being advertised, the value V should be constructed as follows: Produce a value V , where: The first 16 bytes are K. The next bytes are the Salt see Rotation. Personalized Name The Seeker can write a personalized name to the Provider during the first pairing and when the user edits the name on the Seeker side.

Writes to Additional Data characteristic with personalized name may happen in 2 flows: After initial pairing, the Seeker may write a personalized name to the Provider after writing the account key. After a user modifies the personalized name on the Seeker, the Seeker will write the new name to the Provider: handshake from step 1 to step 4 in the above procedure to identify each other and know which account key will be used for the encryption and decryption of the name. In Table 1.

Set Data ID to 0x01 as personalized name. Characteristic: Additional Data This service shall have the following characteristic. The last block can be less than 16 bytes. Perform concat encryptedBlock[0], encryptedBlock[1], AES key is generated or identified from the handshake, e. Perform concat clearBlock[0], clearBlock[1], Silence Mode Recent versions of Android support allowing a Provider to enter silence mode, meaning audio will no longer be routed to it while this mode is active.

Silence mode can be enabled or disabled using the above message stream support by sending these parameters: Message Group Name Value Bluetooth event 0x01 Bluetooth Event Code Name Value Enable silence mode 0x01 Disable silence mode 0x02 The additional data length for both cases is 0.

As an example, to enable silence mode, the Provider should send the following packet: 0x where, The first byte 0x01 means this is a Bluetooth event command The second byte 0x01 means to enable silence mode The third and fourth bytes 0x mean no additional data is included One use case for silence mode is for on-head detection. Companion app events Using the above message stream support, Providers can send events to their companion app when it is installed on the Seeker device.

Message Group Name Value Companion app event 0x02 Companion App Event Code Name Value Log buffer full 0x01 Whenever a message is received by the Seeker with the companion app event group, it will be passed to the companion app registered for the Provider. Device information Providers can notify a Seeker about device information via the message stream. Specifically for the left and right bud case: 0x00 0b : Neither bud active 0x01 0b : Right bud active, left inactive 0x02 0b : Left bud active, right inactive 0x03 0b : Both buds active Capabilities A Provider may sometimes wish to have knowledge of features that the Seeker which it is connected to supports.

The message will contain a list of bits signifying which features are available: Bit 0: 1 if the companion app is installed, 0 otherwise Bit 1: 1 if silence mode is supported, 0 otherwise All other bits reserved for future use and should be set to 0 For example, a Seeker which does not have the companion app installed but does support silence mode would send 0x upon connection: 0x Device information event 0x Capabilities value 0x Additional data, length 1 0x Additional data, silence mode supported Platform Type Providers may want to perform differently based on the platform that they are connected to.

The message will contain a first byte identifying platform type in the additional data: Platform Name Value Android 0x01 The second byte will be customized per platorm.

Device action Seekers can request that a Provider takes an action. Message Group Name Value Device action event 0x04 Device Action Code Name Value Ring 0x01 Ringing a device One use case for these actions is the Seeker requesting the Provider to ring, for example when a user has lost the device and needs to locate it.

For example, if the first byte of additional data is set to: 0x00 0b : All components should stop ringing 0x01 0b : Ring right, stop ringing left 0x02 0b : Ring left, stop ringing right 0x03 0b : Ring both left and right On Providers which do not support individual ringing, only 1 bit should be considered: 0x00 0b : Stop ringing 0x01 0b : Start ringing The second byte in additional data, if present, represents the timeout in seconds.

Syncing ringing status back to Seekers Providers may want to notify a Seeker when it changes the ringing status, for example if a gesture causes the ringing to stop. Acknowledging an action When an action is received, it should be acknowledged so that the Seeker knows whether or not the action was performed.

Acknowledgements Some message codes require an acknowledgement from the receiver. For example, if the Provider receives a message containing the ring action 0x , it should acknowledge the action by sending back 0xFF where: 0xFF: ACK event 0x ACK code 0x Additional data length 0x Additional data, the action message group and code For a NAK, the reason should also be included as the first byte of additional data.

Reasons include: 0x Not supported 0x Device busy 0x Not allowed due to current state From the previous example, if the ring were to be NAK'ed instead due to the Provider being busy with another task, the returned packet should be set to 0xFF Retroactively Writing Account Key If a Seeker performs a pairing through the traditional way for example, through Bluetooth settings instead of through the Fast Pair entrypoint, there will be no account key written into the Provider.

If the Provider is bonded without going through the Fast Pair flow, allow a new account key to be written through the Key-based Pairing method for up to one minute. Only accept one account key to be written during this time. If not, reject the request. Add model ID characteristic , add optional battery notification extension , add personalized name , add message stream , add firmware revisions , add retroactively writing account key , removal of A2DP or HFP requirements.

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