@startuml
skinparam NoteTextAlignment left
skinparam Padding 2
skinparam ParticipantPadding 50
skinparam LifelineStrategy solid

participant "FHIR Server" as S
participant Subscriber    as C

group Normal Operation
  ...
  S -> C: Notification ""Bundle""\n""type: **event-notification**""\n""eventsSinceSubscriptionStart:  **25**""\n""notificationEvent.eventNumber: **25**""\n
  return ""200: OK""
  ...
  S -> C: Notification ""Bundle""\n""type: **event-notification**""\n""eventsSinceSubscriptionStart:  **26**""\n""notificationEvent.eventNumber: **26**""\n
  return ""200: OK""
  ...
end

note left of C
  Heartbeat timeout elapses
  without a notification...
end note

group Check Subscription Status
  C -> S: ""GET .../Subscription/<id>/$status""
  return ""SubscriptionStatus""\n""status: **error**""\n""eventsSinceSubscriptionStart: **28**""
end

group Recovery Process
  ...
  C <-> S: FHIR API calls...
  ...
end

group Re-enable Subscription
  C -> S:Update Subscription\n""status: requested""
  return ""200: OK""
  ...
end

group Resume Normal Operation
  S -> C: Notification ""Bundle""\n""type: **event-notification**""\n""eventsSinceSubscriptionStart:  **29**""\n""notificationEvent.eventNumber: **29**""\n
  return ""200: OK""
  ...
end
@enduml