A curated list of MQTT related stuff.
MQTT is a lightweight client-server publish/subscribe messaging protocol, optimized for high-latency or unreliable networks. This protocol is a good choice for Internet of Things applications, Telemetry, Sensor Networks, Smart Metering, Home Automation, Messaging and Notification Services.
There are many inexpensive smart home Wi-Fi devices based on inexpensive ESP8266 chip (see: 1, 2, 3). Most of them can be reflashed with custom firmware. Here are complete firmwares to turn them into MQTT-controlled smart home nodes:
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