I have scoured the community and if the answer is there I am just not smart enough to decipher the answer, so thank for your patience.
Is this correct?
The GTM only advertises its existence when it has a message to deliver. Be it the originator or one of the nodes in the mesh. The GTMs in general are listening most of the time, or at some short interval, but constantly. I would love to know the exact timing on this if anyone knows. Once a message is delivered, a confirmation is sent out and all the GTMs that have that message in their queue are happy and let it go to the netherworld.
So the GTMs are not advertising at regular intervals to build the mesh, so are they building a most efficient path, self-healing if a node goes down to reroute?