ChirpStack is the most popular open-source LoRaWAN Network Server and Application Server (MIT licence) for private deployments, supporting LoRaWAN 1.0.x and 1.1, multi-tenant operation and a web UI plus gRPC/REST APIs.
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The ChirpStack stack includes a Network Server (deduplication, ADR, MAC-command handling, security), an Application Server (payload decoding, MQTT and HTTP integrations) and a web UI for managing gateways, devices and applications. It is multi-tenant — organisations are properly isolated — and can be self-hosted on Docker, Kubernetes or a plain Linux VM. It is the de-facto standard for private LoRaWAN networks. Notable alternatives include the commercial Loriot Server and the older LoRaServer project (now deprecated and superseded by ChirpStack itself).
For production, deploy ChirpStack with PostgreSQL and Redis on persistent storage and use the gRPC API for integration — the REST API is convenient for scripts but lags slightly behind the gRPC API in feature coverage.
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