Application method of Bluetooth low-energy electronic lock based on built-in offline pairing passwords, interactive unlocking method of a Bluetooth electronic lock and electronic lock system

An application method of a Bluetooth low-energy electronic lock based on built-in offline pairing passwords, comprising steps of:

• Step 1, initializing a built-in temporary password set of a Bluetooth electronic lock after the Bluetooth electronic lock leaves a factory;
• a) uploading a universally unique identifier (UUID), geographic address/location information and installation time of the electronic lock device through an application (APP) for configuration in a mobile phone;
• b) a cloud server generating 100 sets of 16-bit temporary passwords through an obfuscation algorithm;
• and
• c) the APP for configuration in the mobile phone, downloading the 100 sets of 16-bit temporary passwords and storing the same into an on-chip memory of the Bluetooth electronic lock;
• Step 2, the Bluetooth electronic lock broadcasting a random device address periodically when in use;
• Step 3, a mobile-phone temporary-door-opening APP initiating a device scanning request of the Bluetooth electronic lock;
• Step 4, the Bluetooth electronic lock returning to the mobile-phone temporary-door-opening APP an index number of a temporary door-opening password, with the index number having 2 bytes arranged in a disordered manner, wherein the temporary door-opening password is one of the 100 sets of 16-bit temporary passwords;
• Step 5, the mobile-phone temporary-door-opening APP querying a currently-used temporary door-opening password from the cloud server through the index number, with the currently-used temporary door-opening password corresponding to the index number;
• Step 6, the cloud server returning through a database a preset temporary door-opening password corresponding to the index number, a UUID and a unique public address of the electronic lock corresponding to the geographic address/location information;
• Step 7, performing pairing-free device connection through the public address, and the mobile-phone temporary-door-opening APP initiating a device service discovery request, with the service discovery request having a message data segment carrying the UUID and the temporary door-opening password;
• Step 8, the electronic lock receiving the UUID and the temporary door-opening password which are returned from the cloud server to the mobile-phone temporary-door-opening APP and determining, by comparison, whether the currently-used temporary door-opening password which is built in the electronic lock and corresponding to the index number is identical to the temporary door-opening password which is returned from the cloud server to the mobile-phone temporary-door-opening APP, wherein if the currently-used temporary door-opening password which is corresponding to the index number is identical to the temporary door-opening password which is returned from the cloud server to the mobile-phone temporary-door-opening APP, the electronic lock performs an unlocking action, and scrolls, after a door is temporarily opened successfully, a temporary door opening password index table, and identifies the temporary door opening password as invalidated.