Retrieving complete configuration from cloud
This can be used when the device re-establishes the connectivity with cloud after a disconnection. This will help in syncing the configuration changes happened in cloud when the device was disconnected.
First, a device subscribes to $iothub/twin/res/# to receive the configuration data.
The DyoCense cloud will in create a subscription for the device on topic, {device_id}/$iothub/twin/res/#. (no changes required in device).
Then, device sends an empty message to topic - $iothub/twin/GET/?$rid={request id}, with a populated value for request ID.
The DyoCense cloud then sends a response message containing the device twin data on topic {device_id}/$iothub/twin/res/{status}/?$rid={request id}, using the same request ID as the request. The received payload will be exactly same as the configuration object depicted in above section. The possible values of {status} are as in below table.
200 Successfully retrieved 400 Bad request 500 Internal server error. Retry again