You can update the value of a datapoint on a device using the IzoT Server datapoints resource. To update a datapoint, you must first either create a session with the IzoT Server, or pass in credentials with each update request as described in Using cURL to Access the IzoT Server REST API. To update the value, send a PUT request specifying the content type of the data as described in Using cURL to Access the IzoT Server REST API. See the Test Page for examples.