SM/UDP

The SM/UDP (Short Message/User Datagram Protocol) feature allows devices to leverage the very small data footprint of Remote Manager SM protocol (currently used for SMS) over UDP. However, it is important to note that SM/UDP requests vary greatly from SMS as SM/UDP requests are not immediately sent to a device. Instead, requests of this type are queued as devices may not be publicly addressable. This creates a way for devices to interact with Remote Manager in a way that is efficient from a data perspective and does not require a persistent connection. This feature enables devices with constrained data plans to keep data traffic to an absolute minimum by only occasionally sending data readings to Remote Manager.

Initially, no requests are queued in the server. A device will send a request to the server and the server will process the request, sending a reply to the device only if the device specified that one should be sent in the request.

At some point an SM/UDP request may be targeted for the device. This request can be sent via a Web Services request, using the options within the Actions Menu of the Devices page, or as the result of an automation. When a device sends an SM/UDP request (known as a datagram) to Remote Manager, Remote Manager will process the request and queue it for delivery to the device. The next time the device sends a message (regardless of whether a reply was specified), Remote Manager will check for queued messages and send them down to the device.

For example, if you send the SM/UDP Reboot request to your device, the device will not reboot immediately. Instead, the SM/UDP Reboot request will be queued for the device. The next time an SM/UDP request is sent to the device, Remote Manager will check for queued messages and send the queued SM/UDP Reboot request to the device instructing it to reboot itself. Once a request is queued for a device, it may remain queued for multiple days. Once the request is actually sent to a device, it typically has a timeout of 60 seconds (plus a small window in some circumstances).