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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.
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amp-embedded-infra-lib
amp-embedded-infra-lib is a set of C++ libraries and headers that provide heap-less, STL like, infrastructure for embedded software development
I would also like to recommend the embedded template library ETL https://www.etlcpp.com/. It replaces almost everything from the standard template library without using dynamic allocation. So you can use for example vectors, but you have to define at compiling time what maximum size it will have.
Currently leaning C++ for embedded as well. My guideline book that I am reading at the moment is "Real-Time C++ by Christopher Kormanyos (third edition)" (https://github.com/ckormanyos/real-time-cpp)
I am personally a bigger fan of the https://github.com/philips-software/embeddedinfralib/tree/modern-cmake project.