Endpoint Lifecycle service (EPL) is a Kaa platform component that monitors endpoint connectivity status and can update a configurable endpoint metadata field with a current connectivity status.
EPL supports a number of interfaces to perform its functional role. The key supported interfaces are summarized in the following diagram.
For inter-service communication, Kaa services mainly use REST APIs and messaging protocols that run over NATS messaging system.
Endpoint connectivity events
To know when endpoint goes online or offline, EPL listens to endpoint connectivity events defined in 9/ELCE.
EP metadata management
EPL can be optionally configured to update current EP connectivity state as EP metadata field in Endpoint Register (EPR) or other compatible EP register service using the REST API of that service.
Time series transmission
EPL can be configured to produce time series data points on endpoint connect and disconnect. To do so, EPL supports 14/TSTP and acts as a time series transmitter to subscribers. The time series will contain a JSON record with the “value” field set to 1 for online status, 0 - for offline. See the configuration page for information on how to configure this interface. If you don’t need this functionality, just do not configure this section.
EPL is integrated with the Kaa Tekton for centralized application configuration management. It receives configuration update messages from Tekton over 17/SCMP and uses Tekton REST API to retrieve current configs.
See configuration for more information.