MQTT

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What

MQTT is pronounced 'mosquito' , ISO20922 describes it.

It's a simple messaging protocol with a publish/subscribe based model.

Where

No clue, but it runs somewhere on space :) nmap around for a open port 1883? :D

Whats it used for

Power Meter

The Power_Meter project publishes it's readings to the following topics;

#define MQTT_TOPIC_WATT "powermeter/watt"
#define MQTT_TOPIC_KWH "powermeter/kwh"
#define MQTT_TOPIC_PULSE "powermeter/pulsecount"

(from; https://github.com/NURDspace/kwhMeter/blob/master/src/config.h_sample)