I wanted to make sure this thread is correct. After a day of debugging I found the problem I was having.
My sketch used the following:
request(Data1_ID, V_TEXT, 1); The last variable (1) I believe is used to request an ack from the controller. Using MysController I was able to determine the 1 prevented MySensors from sending the request message somehow. When I changed it to 0, the requests were sent. Not sure if this is a bug, or intended.
Also, I am using the current STABLE version of Domoticz, V3.8153, and it works fine in responding to the requests once I made the change above.
Lastly, at least in the tab I was looking at in MysController, it never showed the response message going back from the controller to the node. Perhaps I did not look in the right place, or that is the way MysController is intended to operate. In either case the response messages were seen by the node.