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Uplink

An uplink is a message sent from the device to the Cloud — the counterpart to a downlink. Uplinks carry the data a CHESTER reports: sensor measurements, along with status, session, and codec information.

Reporting Schedule​

A device reports on a schedule set by its configuration:

  • interval-sample — how often the device samples its sensors
  • interval-aggreg — how often those samples are aggregated
  • interval-report — how often the aggregated data is sent to the Cloud as an uplink

You can change these remotely with a Config downlink.

Payload and Decoding​

To save power and airtime, a device encodes its data compactly (CBOR) using its codec. The Cloud decodes it into readable JSON with the matching decoder, which the device uploads automatically whenever its codec changes. The decoded JSON is what you see and inspect in the device's Messages.

Message Types​

Uplink messages have the direction up. For the full list of message types (Data, Session, Config, Encoder, Decoder, …) and how to browse and filter them, see the Messages page.