To make it exclusive operation. no previous request should be pending when a new operation is requested. So only one state machine is running at a time. otherwise, while chamber fill is in progress...
To make it exclusive operation. no previous request should be pending when a new operation is requested. So only one state machine is running at a time. otherwise, while chamber fill is in progress, anyone can request drain and both requests will be handled. even through new code run only one state machine at a time, this will ensure that only one request is submitted to drybicart
This was a concern reported by Sean and proposed for restructuring into a single state machine.
