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You are reading outdated documentation. This page documents ChirpStack v3. ChirpStack v4 is the latest version.

Semtech Collos

Collos is a platform provided by Semtech which provides localization algorithms as a service. Please refer to for more information and for signing up.


ChirpStack Geolocation Server integrates with the Collos v2 TDoA localization algorithm. Both single-frame and multi-frame TDOA are implemented.


For more information on metrics, see Prometheus metrics. The Collos backend exposes the following metrics:


A Histogram type metrics tracking the total number of API calls to the Collos API endpoint and their durations (using buckets).