mqtt2chrome by @matbor subscribes to a topic and displays any messages published to that topic in a nice Chrome popup notification. Uses websockets, javascript and Chrome browser extensions.
Stefano Costa is using mqttwarn to notify his smartphone (via Pushover) when the server room temperature rises above a particular threshold. In this recipe Stefano uses a Choral Greenwich, a Java based GPS- and GPRS-enabled sensing box.

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