Over-the-air updating method, update server, terminal device, and internet of things system

An internet of things system, comprising an update server and a terminal device, the update server being communicatively connected to the terminal device;

• wherein the update server comprises a processor and a memory, the memory stores first instructions, the first instructions, when being executed by the processor of the update server, cause the processor of the update server to perform following steps:
• generating an encryption public key and an encryption private key that match with each other;
• sending the encryption public key to the terminal device;
• generating the update key, and encrypting the update key with the encryption private key;
• sending the encrypted update key to the terminal device upon receiving a heartbeat packet from the terminal device, through a persistent connection between the terminal device and the update server, to cause the terminal device to decrypt the encrypted update key with the encryption public key;
• encrypting update data with the update key;
• and
• sending the encrypted update data to the terminal device to cause the terminal device to decrypt the update data with the decrypted update key and perform a data updating with the update data;
• wherein the terminal device comprises a processor and a memory, the memory stores second instructions, the second instructions, when being executed by the processor of the terminal device, cause the processor of the terminal device to perform following steps:
• receiving the encryption public key sent by the update server;
• upon sending the heartbeat packet to the update server, receiving the update key sent by the update server through the persistent connection between the terminal device and the update server, wherein the update key is encrypted by the update server with the encryption private key matching the encryption public key;
• decrypting the encrypted update key with the encryption public key;
• receiving update data sent by the update server, wherein the update data is encrypted by the update server with the update key;
• decrypting the update data with the decrypted update key;
• and
• performing the data updating with the update data.

An over-the-air updating method, applied to an internet of things system comprising an update server and a terminal device, the update server being communicatively connected to the terminal device, wherein the method comprises:

• generating, by the update server, an encryption public key and an encryption private key that match with each other;
• sending, by the update server to the terminal device, the encryption public key;
• receiving, by the terminal device, the encryption public key from the update server;
• generating, by the update server, the update key, and encrypting, by the update server, the update key with the encryption private key;
• sending, by the terminal device to the update server, a heartbeat packet;
• upon receiving the heartbeat packet from the terminal device, sending, by the update server to the terminal device, the encrypted update key through a persistent connection between the terminal device and the update server, receiving, by the terminal device through the persistent connection between the terminal device and the update server, the encrypted update key from the update server;
• decrypting, by the terminal device, the encrypted update key with the encryption public key;
• encrypting, by the update server, update data with the update key;
• sending, by the update server to the terminal device, the encrypted update data;
• decrypting, by the terminal device, the encrypted update data with the decrypted update key;
• and
• performing, by the terminal device, a data updating with the update data.