I know that ARDOP has a working Ping function. Would it be easy to add this function to VarAC too if it's possible to do with the VARA code? I think that being able to Ping a set of call letters and get a an immediate response as to weather they are on frequency is a very useful function compared to going through a connect procedure just to see if they are about.
To see this working, head to your live site.
No such feature on Vara protocol. Only a full connect is possible.