I suggest this LoRaWAN nodes’ simulator to simulate a LoRaWAN Network, equipped with a web interface. It allows communication with a real infrastructure LoRaWAN or ad-hoc infrastructure, such as Chirpstack.
It is equipped with a Web GUI to manage the simulator instance and virtual nodes/gateways (also the real gateways).
We are using it in our company to simulate a couple of LoRaWAN nodes with virtual and real gateways!