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Introduction

The STH source operator is a WireCloud operator that allows you to retrieve historical information about context broker entities through the use of the Short Time Historic (Comet) component.

Settings

  • STH server URL: URL of the STH server to use for retrieving entity information
  • NGSI tenant/service: Tenant/service to use when connecting to the context broker. Must be a string of alphanumeric characters (lowercase) and the _ symbol. Maximum length is 50 characters. If empty, the default tenant will be used
  • NGSI scope: Scope/path to use when connecting to the context broker. Must be a string of alphanumeric characters (lowercase) and the _ symbol separated by / slashes. Maximum length is 50 characters. If empty, the default service path will be used: /
  • Entity Type: Entity Type to use for retrieving entity information. Currently this preference cannot be empty.
  • Initial Entity: Id of the initial entity to query. Leave this preference empty for disabling this initial query.
  • Attribute: Attribute of the entity to query about.

Wiring

Input Endpoints

  • This operator has no input endpoint

Output Endpoints

  • Values: Historical values as an array.
  • Timestamps: Timestamps of the values provided by the Values endpoint.

References