How to implement a Websocket in Android Studio to send messages to a server running on Visual Studio Code?

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I’m trying to establish a connection from my Android Studio application to a Server who’s running on Visual Studio Code, to send data with Websockets. The server works just fine and is implemented with this function:

async def main(): 
    server = await websockets.serve(
        connect,
        'localhost',
        8766, 
    )
    await server.wait_closed()

Now I’m trying to connect to this server on my Android Studio Application with the following code (example from ktor.io):

fun main() {
        val client = HttpClient(CIO) {
            install(WebSockets)
        }
        runBlocking {
            client.webSocket(port = 8766) {
                while(true) {
                    val othersMessage = incoming.receive() as? Frame.Text
                    println(othersMessage?.readText())
                    val myMessage = Scanner(System.`in`).next()
                    if(myMessage != null) {
                        send(myMessage)
                    }
                }
            }
        }
        client.close()
    }

Therefore, i added the necessary dependencies:

implementation("io.ktor:ktor-client-cio:1.6.7")
implementation("io.ktor:ktor-client-websockets:1.6.7")

Unfortunately, the connection is refused (“Failure(java.net.ConnectException: Connection refused)”). When I try to connect on Visual Studio Code, it works perfectly fine (with deactivated Firewall):

async with websockets.connect("ws://localhost:8766") as websocket:
...

Does anybody know where the problem could be?