digraph {
	node [color=lightgrey fontname=Arial shape=ellipse style=filled]
	edge [fontname=Arial]
	subgraph cluster_sensor_nodes {
		color=blue label="Ad-hoc Network" style=dashed
		"Sensor Nodes 1" [label="ESP8266 Nodes
(Temperature Sensors)"]
		"Sensor Nodes 2" [label="ESP8266 Nodes
(Temperature Sensors)"]
		"Sensor Nodes 3" [label="ESP8266 Nodes
(Temperature Sensors)"]
		"Sensor Nodes 4" [label="ESP8266 Nodes
(Temperature Sensors)"]
	}
	"Exit Node" [label="ESP8266
(Exit Node)"]
	"Backend Server" [label="Rust Backend
(on PC)"]
	"Postgres DB" [label="PostgreSQL
Database"]
	Frontend [label="Frontend
(Web Browser/App)"]
	API [label=API]
	User [label=User]
	"Sensor Nodes 1" -> "Exit Node" [label="Sends Data"]
	"Sensor Nodes 2" -> "Exit Node" [label="Sends Data"]
	"Sensor Nodes 3" -> "Exit Node" [label="Sends Data"]
	"Sensor Nodes 4" -> "Sensor Nodes 3" [label="Sends Data"]
	"Exit Node" -> "Backend Server" [label="Sends Data over WLAN"]
	"Backend Server" -> "Postgres DB" [label="Persists Data in DB"]
	"Backend Server" -> API [label="Provides API Endpoints"]
	Frontend -> API [label="API Calls to Backend"]
	User -> Frontend [label="Interacts with Frontend"]
}