Create your own JavaScript-based MQTT broker & its client (subscriber & publisher) using Mosca & MQTT.js, then save the message from publisher on MySQL database. Mosca is a Node.js MQTT broker, which can be used standalone or embedded in another Node.js application (http://www.mosca.io/), while MQTT.js is an MQTT client for Node.js and the browser (https://github.com/mqttjs/MQTT.js).
Full tutorial & source code:
https://github.com/LintangWisesa/Mosca_MQTTjs_MySQL_MongoDB
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