Testing Gateway without nodes

[Totony]

Hey everyone,

I'm building my system from the ground up, so I started with the gateway. (MQTT in order to connect to openHAB)

Before making some nodes, I'd like to know if the gateway can be tested, by simulating some nodes. Is it possible to do so by sending Serial messages to the GTW on its serial?

Thanks in advance for your help,
Totony.