I have a Linux hub, and I just want a reliable means of talking from that to a bunch of nodes which control hot water, heat,etc. I want the nodes to be as reliable and autonomous as possible, ie just my own bare-metal code, so I chose Arduino. MQTT is the protocol for comms, so my iOS and Android speak MQTT to the Linux box (running MQTT broker - Mosquito) and the Linux box broadcasts MQTT messages, which the Arduino nodes listen for and respond to.
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