I have the same problem.
openSUSE Linux connected by ethernet
moto e2 android 5.1 wifi and usb cable
editor and dmengine version: 1.2.117
“Waiting for connection …” in dmengine
In Defold editor “Target” only “new local engine”
–update.–
well I discovered that the openSUSE firewall blocks the connection, the new question is:
what ports do I have to open in the firewall to make it work?