ENVI-R – Data Broker Setup
May 1, 2011
Continuing my previous post on this topic, I realized I needed a message broker in order to permit me to have a daemon polling the ENVI-R for data, processing it, and then making it available in a palatable form for various scripts and for MRTG. It would have been possible for me to simply have a cron job dump a summary table to disk every few seconds, but since my Linux box uses a CompactFlash card for disk storage, that would quickly kill the flash chips. I needed something that held the messages in memory only. That’s where a MQTT message broker steps in.