Bluetooth device connection methods and bluetooth devices

A computer-implemented system, comprising:

• one or more computers;
• and one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:
• generating, by a first Bluetooth device, a code;
• encrypting, by the first Bluetooth device, the code to generate a first ciphertext in response to detecting that a Bluetooth connection is disconnected;
• generating, by the first Bluetooth device, a broadcast packet based on the first ciphertext, and broadcasting the broadcast packet to one or more Bluetooth devices, wherein the one or more Bluetooth devices includes a second Bluetooth device external to the first Bluetooth device;
• receiving, by the first Bluetooth device, a scanning request from the second Bluetooth device, the scanning request including a random private address generated by the second Bluetooth device;
• verifying the scanning request from the second Bluetooth device based on the random private address;
• sending, by the first Bluetooth device and in response to verifying the scanning request, a scanning response to the second Bluetooth device based on the random private address in the scanning request;
• and establishing, by the first Bluetooth device, a Bluetooth connection with the second Bluetooth device in response to determining that a connection request from the second Bluetooth device is received by the first Bluetooth device in response to the scanning response;
• wherein verifying the scanning request from the second Bluetooth device based on the random private address occurs after receiving, by the first Bluetooth device, the scanning request from the second Bluetooth device, and before sending the scanning response to the second Bluetooth device, and the verifying comprises:
• decrypting the random private address in the scanning request by using a second decryption algorithm based on the code and a locally-stored key, to obtain a decrypted fixed address;
• determining whether a pre-stored fixed address at the first Bluetooth device is the same as the decrypted fixed address, wherein the pre-stored fixed address at the first Bluetooth device, the locally-stored key, and the second decryption algorithm are agreed upon jointly by the first and second Bluetooth devices;
• and in response to determining that the pre-stored fixed address is the same as the decrypted fixed address, sending the scanning response to the second Bluetooth device.

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• generating, by a first Bluetooth device, a code;
• encrypting, by the first Bluetooth device, the code to generate a first ciphertext in response to detecting that a Bluetooth connection is disconnected;
• generating, by the first Bluetooth device, a broadcast packet based on the first ciphertext, and broadcasting the broadcast packet to one or more Bluetooth devices, wherein the one or more Bluetooth devices includes a second Bluetooth device external to the first Bluetooth device;
• receiving, by the first Bluetooth device, a scanning request from the second Bluetooth device, the scanning request including a random private address generated by the second Bluetooth device;
• verifying the scanning request from the second Bluetooth device based on the random private address;
• sending, by the first Bluetooth device and in response to verifying the scanning request, a scanning response to the second Bluetooth device based on the random private address in the scanning request;
• and establishing, by the first Bluetooth device, a Bluetooth connection with the second Bluetooth device in response to determining that a connection request from the second Bluetooth device is received by the first Bluetooth device in response to the scanning response;
• wherein verifying the scanning request from the second Bluetooth device based on the random private address occurs after receiving, by the first Bluetooth device, the scanning request from the second Bluetooth device, and before sending the scanning response to the second Bluetooth device, and the verifying comprises:
• decrypting the random private address in the scanning request by using a second decryption algorithm based on the code and a locally-stored key, to obtain a decrypted fixed address;
• determining whether a pre-stored fixed address at the first Bluetooth device is the same as the decrypted fixed address, wherein the pre-stored fixed address at the first Bluetooth device, the locally-stored key, and the second decryption algorithm are agreed upon jointly by the first and second Bluetooth devices;
• and in response to determining that the pre-stored fixed address is the same as the decrypted fixed address, sending the scanning response to the second Bluetooth device.