Method for connection establishment and internet of things (IoT) device

A method for connection establishment, performed by a service device, comprising:

• receiving a write operation message comprising token information of the service device sent by a configuration device, the token information being acquired by the configuration device from a cloud device:
• wherein the service device comprises a model information cluster, and the model information cluster is configured to store information related to a cloud operation;
• writing the token information into the model information cluster based on the write operation message;
• and
• establishing a CASE connection with the cloud device based on the token information.

An Internet of Things (IoT) device, realized as a configuration device, comprising a processor, a memory, and a transceiver;

• wherein the transceiver is configured to acquire token information of a service device from a cloud device, after a connection is established with the service device;
• and
• wherein the transceiver is further configured to send a write operation message comprising the token information to the service device, the token information being configured for establishing a CASE connection between the service device and the cloud device;
• wherein the write operation message is configured to instruct the service device to write the token information into a model information cluster in the service device, and the model information cluster is configured to store information related to a cloud operation.