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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Ive used software serial on an ESP to a hardware serial on an Arduino, was very reliable, if the data isn't mission critical or time sensitive i can't see an issue, just use sequence counters or acks. Library: http://www.billporter.info/easytransfer-arduino-library/
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