feat: support periodic ping to principal for keeping connection alive #288
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This PR is to introduce a configurable periodic ping event to keep connection alive between agent and principal. The agent will send an event to principal after given interval, principal will not process this event and just acknowledge it. By default it is disabled and to enable it devs need to set value of
agent-ping-interval
in startup script or set envAGENT_PING_INTERVAL
variable.Fixes #171