Cloud access method for Iot devices, and devices performing the same

1. A cloud access method using a cloud proxy function, comprising:

receiving, from a cloud, a first request for resource retrieval of a client device;

extracting, from the first request for resource retrieval, a device identification (ID) of a device comprising a resource for which the resource retrieval is requested; and

transmitting, to the device, a second request for resource retrieval based on the device ID, the second request being modified from the first request by the cloud proxy function.

2. The cloud access method of claim 1 , wherein:

the first request for resource retrieval comprises a proxy-uniform resource identifier (URI) option header, and

the proxy-URI option header is removed from the second request for resource retrieval.

3. The cloud access method of claim 2 , wherein the proxy-URI option header comprises the device ID.

4. The cloud access method of claim 2 , comprising:

receiving a request for registration of the device from a mediator;

obtaining the resource of the device; and

publishing the resource of the device to the cloud.

5. The cloud access method of claim 4 , comprising:

generating an object entry corresponding to the device based on the resource and the device ID of the device and storing the generated object entry.

6. The cloud access method of claim 1 , wherein the device has no cloud interworking function of interworking with the cloud.

7. The cloud access method of claim 1 , wherein the transmitting comprises:

searching for the device ID and endpoint information of the device from a mapping list that is used for managing device-to-device (D2D) devices that have no cloud interworking function of interworking with the cloud.

8. The cloud access method of claim 1 , further comprising:

requesting the cloud for registration of a cloud proxy device that supports the cloud proxy function; and

receiving an access token for the cloud proxy device that is issued by the request for the registration.

9. The cloud access method of claim 1 , wherein the first request for resource retrieval is a resource retrieval request forwarded by the cloud after being transmitted from the client device to the cloud.

10. A computer program embodied on a non-transitory computer readable medium, the computer program being configured to control a processor to:

receive, from a cloud, a first request for resource retrieval of a client device;

extract, from the first request for resource retrieval, a device identification (ID) of a device comprising a resource for which the resource retrieval is requested; and

transmit, to the device, a second request for resource retrieval based on the device ID, the second request being modified from the first request by the cloud proxy function.

11. A cloud proxy device supporting a cloud proxy function, comprising:

a memory configured to store therein at least one instruction; and

a processor configured to execute the instruction,

wherein, when the instruction is executed, the processor is configured to:

receive, from a cloud, a first request for resource retrieval of a client device;

extract, from the first request for resource retrieval, a device identification (ID) of a device-to-device (D2D) device comprising a resource for which the resource retrieval is requested; and

transmit, to the D2D device, a second request for resource retrieval based on the device ID, the second request being modified from the first request by the cloud proxy function.

12. The cloud proxy device of claim 11 , wherein:

the first request for resource retrieval comprises a proxy-uniform resource identifier (URI) option header, and

the proxy-URI option header is removed from the second request for resource retrieval.

13. The cloud proxy device of claim 12 , wherein the proxy-URI option header comprises the device ID.

14. The cloud proxy device of claim 12 , wherein the processor is further configured to:

receive a request for registration of the D2D device from a mediator;

obtain the resource of the D2D device; and

publish the resource of the D2D device to the cloud.

15. The cloud proxy device of claim 14 , wherein the processor is further configured to:

generate an object entry corresponding to the D2D device based on the resource and the device ID of the D2D device and store the generated object entry.

16. The cloud proxy device of claim 11 , wherein the D2D device has no cloud interworking function of interworking with the cloud.

17. The cloud proxy device of claim 11 , wherein, when the second request for resource retrieval is transmitted, the processor is further configured to:

search for the device ID and endpoint information of the D2D device from a mapping list that is used for managing devices that have no cloud interworking function of interworking with the cloud.

18. The cloud proxy device of claim 11 , wherein the process is further configured to:

request the cloud for registration of the cloud proxy device; and

receive an access token for the cloud proxy device that is issued by the request for the registration.

19. The cloud proxy device of claim 18 , wherein the processor is further configured to:

request the cloud for the registration of the cloud proxy device in response to cloud setting provisioning of a mediator.

20. The cloud proxy device of claim 11 , wherein the first request for resource retrieval is a resource retrieval request that is forwarded by the cloud after being transmitted from the client device to the cloud.