'Empty command' every 25 seconds?

[jwshome]

I use the 99i with Homeseer and the HS plugin. I recently upgraded to v3.3.4 and set my logging level to 'ALL', and I noticed that every 25 seconds the iSY is generating the following messages:

 

COMM: Sending command []

EVNT: Event added to queue. Queue size = 1

EVNT: Event removed from queue. Queue size = 0

 

Should this be happening? Is it some sort of "stay alive' activity that I should not be concerned about?

 

Thanks in advance for any help ...