Building Low-Cost IoT with NodeMCU and Vertx MQTT

On this year's JCrete conference I learned during the hackday about the NodeMCU board, which is an impressive low-cost alternative to an Arduino. It uses the 80 MHz ESP8266 chip that includes WiFi support out of the box. In this article I'd like to describe how to make a simple temperature and pressure sensor device that publishes data via MQTT to a handler implemented using the reactive Vert.x framework. The hardware for the solution costs no more than $15.

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