Indicates whether or not a response is required upon receipt, creation or update of this resource. Responses shall be posted to the collection specified in "replyTo". <br/><br/>If the resource has a deviceCategory field, devices that match one or more of the device types indicated in deviceCategory SHALL respond according to the rules listed below. If the category does not match, the device SHALL NOT respond. If the resource does not have a deviceCategory field, a device receiving the resource SHALL respond according to the rules listed below.<br/><br/>If a DERControl contains multiple DERControl Modes and if the Event responseRequired indicates, status changes for each DERControl Mode SHALL be provided. Clients SHOULD attempt to group all status changes for DERControl Modes with the same createdDateTime and the same status in a single Response.<br/><br/>Value encoded as hex according to the following bit assignments, any combination is possible. <br/>See Table "Response types by function set" for the list of appropriate Response status codes to be sent for these purposes.<br/>0 - End device shall indicate that message was received <br/>1 - End device shall indicate specific response. <br/>2 - End user / customer response is required. <br/>All other values reserved. <br/>