Device ID with HTTP Receiver Data Source
On the edit page for an HTTP Receiver data source there is a "Device ID white list". The default white list is "*".
I see that I could specify __device as the parameter name in the HTTP GET request to set the Device ID. Apart from being checked against the white list of device IDs, is this Device ID used anywhere else or have any other uses or is it a sort of password?
No, the device id currently does not have any other purpose than to check against the white list. If you have multiple devices of the same type which all deliver the same information (multiple wind sensors for example), you can create separate HTTP receiver data sources for each, and be able to segregate their data using the device id.