react-native-tcp-socket: Starting a Server always returns EADDRINUSE on every port

Description

I just followed the example from the npm page for creating a tcp server. If i try to run this it always loggs following: I’ve tried multiple ports but nothing helped. I always get the “Adress already in use” error.

Steps to reproduce

Steps to reproduce the behavior:

1. Start a new RN app with the example from the React Nativ Get Started Documentation
2. Download and install react-nativ-tcp-socket as shown on the github page
3. Implement the Server example as shown in the image in the Description section of this bug report
4. Start the app on youre smartphone with npx react-native run-android
5. A node winow should have poped up where you can now see logs and bundle infos for debugging. It also should now show the error “adress already in use”

The Code of the App:

import * as React from 'react';
import {Text, View} from 'react-native';
import TcpSocket from 'react-native-tcp-socket';

export interface IMainViewProps {}

export interface IMainViewState {
  log: string;
}

const Port = 12345;

export default class MainView extends React.Component<
  IMainViewProps,
  IMainViewState
> {
  constructor(props: IMainViewProps) {
    super(props);

    this.state = {
      log: '',
    };
  }

  writeToLog(msg: string, callback?: () => void) {
    this.setState({log: this.state.log + msg + '\n'}, callback);
  }

  componentDidMount() {
    this.writeToLog('Starting Server on port ' + Port + '...', () => {
      const server = TcpSocket.createServer((socket) => {
        socket.on('data', (data) => {
          this.writeToLog(data);
        });

        socket.on('error', (error) => {
          console.log('An error ocurred with client socket ', error);
        });

        socket.on('close', (error) => {
          console.log('Closed connection with ', socket.address());
        });
      }).listen({port: Port, host: 'localhost'});

      server.on('error', (error) => {
        console.log('An error ocurred with the server', error);
      });

      server.on('close', () => {
        console.log('Server closed connection');
      });
    });
  }

  public render() {
    return (
      <View style={{padding: 10}}>
        <Text style={{color: '#3D9970'}}>{this.state.log}</Text>
      </View>
    );
  }
}

Current behavior

After the App executed it shows the “Starting Server on port…” message and in the console log of the app i can see a “EADDRINUSE” error which means that the given adress is already in use.

Expected behavior

It should just start the tcp server.

Screenshots I have added them in the documentation section of this bug report.

Relevant information

OS	Windows 10 Pro N & Androidversion 10QKQ1.191215.002 (Android 10)
react-native	0.63.3
@types/react-native	^0.63.2
react-native-tcp-socket	^4.5.4