IOT Node Red IBM Bluemix: State Machine/Store Old Data -
i have built simple application connects iot temp sensor device , sends email based on temp--warm, right, , cold. i've used ibm iot node connecting iot device, , processed data case statements fall 3 buckets: warm, right, , cold. there generate email , send temp category email address.
however, temp sensor measuring , sending data every 1 second app sending email every 1 second--which often. instead i'd send email when there transition between 3 temperature states. naturally, i'd implement state machine or case statement processing block. requires have both data points: current temp measurement , last recorded measurement. best way go storing last recorded temp measurement , there tips on node flow should use?
if have @ article:
http://noderedguide.com/index.php/2015/11/06/node-red-lecture-5-the-node-red-programming-model/
we find section called "context". allows maintain state data between instances of message flow either globally or locally particular node. means value received @ earlier time can saved , compared against current value. have use javascript language in function node hoping isn't complicated , there lots of examples around.
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