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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.
You should probably check out LoRA modules. They should be able to achieve >10 km range (under thr right conditions), are reasonably priced and have good library support (e.g. https://github.com/sandeepmistry/arduino-LoRa ). Most of them communicate via SPI or I2C though, so no RX/TX pins.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.
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