====Update (Live Data API)====

Returns the values of all [[data points]] that have changed (or no values if there have been no changes within 30 seconds).

ARDI uses a **long polling** model, which means that when you request an update, you might not get an immediate response. Instead, the server may hold your connection open while it waits for fresh data.

===Details===

|**URL**|/update|
|**Method**|GET or POST|

^Parameter^Meaning^
|id|The subscription ID, as returned from the [[subscribe|subscribe]] call|
|format|The format of the returned value. This can be **xml** or **json**|

===Response===

The response is an XML (default) or JSON encoded collection of points, plus an 'id' column that includes the unique code for your subscription.

See the example in [[subscribe|subscribe]] for more information.