Confused about MQTT support

[lucasl84]

Hi everyone,

I've managed to configure both XMPP and MQTT on ejabberd. However there's something that I still don't fully understand. Is ejabberd supposed to mediate between both implementations? By this I mean that if I send a message from an XMPP client then it should be possible to receive it from an MQTT client and viceversa (e.g: I send a message from gajim then the receiver can read it by just subscribing to a topic for example using mosquitto_sub).

If this is not the case then what is difference between using ejabberd's MQTT implementation against for example a plain Mosquitto server? I'm asking this because I'm having a hard time understanding why ejabberd supports MQTT. If for example I wanted to use only MQTT, how am I suppose to map MQTT topics to users, muc, etc? Does this mapping rely entirely on the user or is standarized by ejabberd?

Thanks for your time,
Lucas.