Race condition hotfix

This is a patch release cherry picking a bug fix from the upcoming maintenance release.

Bug fixes

• Fixed a race condition causing the EventConnector to publish the null payload of ack packets to the UI state store. This occurred with 'high speed' UI driven writes to hardware and would throw an error in the UI.

Update instructions

An automatic upgrade is available by running the following command in your template directory:

arc upgrade --template [email protected]