Interesting, but it requires an overhead of routing one high end protocol (XMPP) over another one. Not sure if it's the best approach. XMPP itself can offer mobile optimizations (like the XEP I brought above), but for some reason the whole thing seems stalled.
It still looks more like a workaround rather than a straight solution. I.e. chatty nature of XMPP is masked / mitigated with MQTT. A proper way is really to reduce the chattiness of XMPP itself in cases when it's needed.
