First wireless audio output device, second wireless audio output device, and Bluetooth device

A second wireless audio output device, configured to:

• receive monitoring instruction information from a first wireless audio output device through a first wireless link, the monitoring instruction information being configured to instruct the second wireless audio output device to monitor interactive information between the first wireless audio output device and an audio source, wherein the first wireless audio output device has a first public-private key pair, the second wireless audio output device has a second public-private key pair, and the first public-private key pair is the same as the second public-private key pair, and wherein the interactive information comprises a public key of the audio source;
• snoop the public key of the audio source in a second wireless link, the second wireless link being a link through which the first wireless audio output device communicates with the audio source;
• and
• determine link information in the second wireless link based on a private key of the second public-private key pair and the public key of the audio source snooped by the second wireless audio output device;
• wherein the first wireless link is between the first wireless audio output device and the second wireless audio output device, and the second wireless link is between the first wireless audio output device and the audio source.

A Bluetooth device, comprising:

• n Bluetooth sub-devices, n being an integer greater than 1, each of the n Bluetooth sub-devices having a public-private key pair, and the public-private key pairs of the n Bluetooth sub-devices are the same;
• wherein a first Bluetooth sub-device is configured to:
• transmit monitoring instruction information to a second Bluetooth sub-device through a first wireless link, wherein the monitoring instruction information is configured to instruct the second Bluetooth sub-device to monitor interactive information between the first Bluetooth sub-device and a terminal, and the interactive information comprises a terminal public key of the terminal;
• and
• transmit a public key of the public-private key pair of the first Bluetooth sub-device to the terminal through a second wireless link, and receive the terminal public key of the terminal;
• and
• wherein a second Bluetooth sub-device is configured to:
• snoop the terminal public key after receiving the monitoring instruction information from the first Bluetooth sub-device, and determine link information between the terminal and the first Bluetooth sub-device based on the terminal public key snooped by the second Bluetooth sub-device and a private key of the public-private key pair of the second Bluetooth sub-device;
• wherein the first Bluetooth sub-device is at least one Bluetooth sub-device in the n Bluetooth sub-devices, and the second Bluetooth sub-device is any one of the n Bluetooth sub-devices except the first Bluetooth sub-device;
• wherein the first wireless link is between the first Bluetooth sub-device and the second Bluetooth sub-device, and the second wireless link is between the first Bluetooth sub-device and the terminal.