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)