Logging MQTT Sensor Data

Data from sensors will need to be stored. But how much do you really need to store? Many sensors like state sensors (ON/OFF), temperature etc will fluctuate very little over the course of a day so does it makes sense to store the same sensor value every x seconds?

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Using The JavaScript MQTT Client With Websockets

Web browsers use the http protocol and modern ones can also use websockets. To publish and subscribe to an MQTT broker with a browser you will need to use a JavaSript MQTT over websockets client. In this tutorial I will take you through a example script that publishes messages and subscribes to topics using MQTT and websockets.

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Creating an MQTT Broker With CloudMQTT

Cloud based brokers are likely to become very popular in the future for organisations they operate over a wide geographic area. In addition they provide a nice user interface making it very easy to setup your own broker instance and you don’t need to have to manage your own virtual server. CloudMQTT like Amazon,Azure etc provide a managed cloud based mosquitto broker. The plans on CloudMQTT are shared plans which means that several MQTT brokers run on the same hardware.

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MQTT Keep Alive Interval Explained

MQTT uses a TCP/IP connection. This connection is normally left open by the client so that is can send and receive data at any time. If no data flows over an open connection for a certain time period then the client will generate a PINGREQ and expect to receive a PINGRESP from the broker.

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Creating an IOT or MQTT Dashboard Using Thingsboard

Thingsboard is an open source IOT platform for data visualization. It is available for download and installation on your own hardware or as an online service for demonstration purposes. In this tutorial we will configure a simple Dashboard to display data from sensors using MQTT and Python.

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