I've got the rPi going with the image and can connect to the web interface. Got a Moteino working also. Checked it with blink test sketch. Uploaded the gateway image..i don't the have any other nodes at the moment..but how can I see if the rPi can talk to the Moteino ok..?
You only got 1 Moteino? Hooked up to your Pi via serial? USB or GPIO serial?
You could simply send the Moteino a message (from the gateway you can use the terminal page send feature) and have it blink the LED when it receives something via serial.