Samsara sensors and gateways communicate wirelessly with each other.
Samsara gateways connect to the Samsara Cloud automatically via built-in Wi-Fi and cellular connectivity, and stream sensor data. If a cellular or Wi-Fi connection is unavailable, the Gateway will store up to 30 days of sensor data. Stored data will be uploaded to the Cloud when connectivity is restored.
As soon as they are powered on and in range of gateways in their Samsara organization, Samsara sensors automatically connect to the gateway and begin streaming live data. No configuration is required, though you may wish to name your devices for ease of identification.