The fields of a <ResponseStatus> document.
optional
requestURL: string
The path the device is answering about.
statusCode: number
0 or 1 OK, 2 Device Busy, 3 Device Error, 4 Invalid Operation,
5 Invalid XML Format, 6 Invalid XML Content, 7 Reboot Required,
9 Additional Error. 7 can come on a 200 after a PUT.
optional
statusString: string
A short description, such as Invalid Operation.
optional
subStatusCode: string
The precise reason, such as notSupport, lowPrivilege or badAuthorization.