Getting current State of the system using Flexbe

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I am using FlexBE to execute robot behaviors. I would like to monitor the current state of the system.

I noticed that when you execute a behavior using the User Interface the following topic keeps track of the current state.

rostopic echo /flexbe/debug/current_state    
data: "/wait1 > done"                                                                                
---                                                                                                  
data: "/sub > received"

I would like to run the onboard behavior engine without Visual interface and get insights of the current state of the system. Do you have any advice?