add check if sessionID is empty (#112)

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [v0.14.1]
+- add fix for empty sessionID [#112](https://github.com/xmidt-org/gungnir/pull/112)
+
 ## [v0.14.0]
 - leverage sessionID for better judgement in offline vs online [#110](https://github.com/xmidt-org/gungnir/pull/110)
 - changed Event struct tag from wrp to json [#110](https://github.com/xmidt-org/gungnir/pull/110)
@@ -155,7 +158,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Initial creation
 - Bumped codex version, modified code to match changes
 
-[Unreleased]: https://github.com/xmidt-org/gungnir/compare/v0.14.0...HEAD
+[Unreleased]: https://github.com/xmidt-org/gungnir/compare/v0.14.1...HEAD
+[v0.14.1]: https://github.com/xmidt-org/gungnir/compare/v0.14.0...v0.14.1
 [v0.14.0]: https://github.com/xmidt-org/gungnir/compare/v0.13.1...v0.14.0
 [v0.13.1]: https://github.com/xmidt-org/gungnir/compare/v0.13.0...v0.13.1
 [v0.13.0]: https://github.com/xmidt-org/gungnir/compare/v0.12.3...v0.13.0

deviceStatus.go

@@ -251,6 +251,9 @@ func determineStatus(lastOnline, lastOffline eventTuple) Status {
 	if lastOnline.status.State == "" {
 		return lastOffline.status
 	}
+	if (lastOnline.sessionID == "" || lastOffline.sessionID == "") && lastOnline.status.Since.After(lastOffline.status.Since) {
+		return lastOnline.status
+	}
 	if lastOffline.sessionID == lastOnline.sessionID {
 		return lastOffline.status
 	}