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LightDB State Client Overview

LightDB is a state-based database service hosted by Golioth. It can be used to create applications involving resource state. Device state such as LED on/off, door lock position, or thermostat settings are easy to manage using the Golioth cloud.

The key differentiator between the LightDB State and LightDB Stream services offered by Golioth is data persistence. LightDB data values do not accumulate, they are replaced with update calls. LightDB State is bidirectional; changes may originate from either the device or the cloud (e.g. via an API call or changes made on the Golioth Web Console). LightDB Stream is a unidirectional service (device to cloud) useful for recording time series data.

Console

The Golioth Zephyr SDK includes three API functions for working with state data:

  • LightDB Get: retrieve stored state data
  • LightDB Observe: register a callback to run whenever data changes
  • LightDB Set: store state data at a specific endpoint
note

The examples in this section all demonstrate working with COAP_CONTENT_FORMAT_APP_JSON format. These API calls can also be used with CBOR serialization by using the COAP_CONTENT_FORMAT_APP_CBOR format. For an example of this, see the Golioth LightDB LED sample code.