Redis in-memory storage
For many Internet of Things (IoT) projects, a message-queuing system like MQTT (message-queuing telemetry transport) is all you need to connect sensors, devices, and graphic interfaces. However, if you have requirements for high throughput or you are storing special data types (e.g., binary data or image files), you should take a look at Redis.
Redis (Remote directory server) [1] is an open source, in-memory data structure store that can be used as a database, cache, and message broker. It supports a wide range of data structures, such as strings, hashes, lists, sets, bitmaps, HyperLogLogs, and geospatial indexes. Redis servers can be loaded locally, or they are available as web-hosted solutions. Redis libraries are available for a wide variety of programming languages.
In this article, I show you how to set up a Redis system with two examples. The first is a flame scanner that connects an Arduino module to a Node-RED web dashboard. The second example is a Raspberry Pi weather station, in which a webcam image is stored in a Redis server and a PHP web page shows the data.
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