Method for automatically establishing wireless connection, gateway device and client device for internet of things using the same

A gateway device for IoT, adapted for providing a wireless network connection service to at least one client device, the gateway device comprising:

• a wireless communication circuit, adapted for wirelessly connecting to at least one surrounding client device;
• a memory circuit, storing a plurality of modules;
• and
• a processing unit, coupled to the wireless communication circuit and the memory circuit, wherein the processing unit controls operation of the wireless communication circuit and accesses the memory circuit for executing the modules, and the modules comprises:
• an encryption module, encrypting an access password of the gateway device, and generating an encryption password;
• a SSID generating module, generating a SSID of the gateway device by using the encryption password and wirelessly broadcasting a beacon containing the generated SSID, wherein the SSID comprises an index and the encryption password;
• and
• a connection module, receiving connection request sent from at least one client device and checking whether an access password of the connection request is correct, and establishing a wireless connection with the at least one client device sending the correct access password.

A client device for IoT, comprising:

• a wireless communication circuit, adapted for wirelessly connecting to a gateway device;
• a memory circuit, storing a plurality of modules;
• and
• a processing unit, coupled to the wireless communication circuit and the memory circuit, wherein the processing unit controls operation of the wireless communication circuit and accesses the memory circuit for executing the modules, and the modules comprises:
• a SSID scanning module, scanning SSIDs of surrounding gateways and selecting one of the SSIDs according to an index through wirelessly receiving a beacon, and acquiring an encryption password from the selected SSID;
• a decryption module, decrypting the encryption password, and acquiring an access password;
• and
• a connection module, sending a connection request comprising the access password to the gateway device having the selected SSID for establishing a wireless connection.