I can't connect on TCP

[sillo1991]

I'm trying to write a simple script to print something but I can't connect to the printer.
Can anyone please help me?

I get the error: PrinterError: Failed to communicate with the devices within the specified time.

this is my code:

import React, {useState, useMemo} from 'react';
import {Button, Alert} from 'react-native';
import {Printer, PrinterConstants} from 'react-native-esc-pos-printer';

const PrintKitchenOrderButton = () => {
const [isLoading, setIsLoading] = useState(false);

const printerInstance = useMemo(
() =>
new Printer({
target: 'TCP:192.168.28.100',
deviceName: 'TM-T20III',
port: 8008,
}),
[],
);

// Function to print
const printReceipt = async () => {
try {
setIsLoading(true);
const connection = await printerInstance.connect();
console.log('connection', connection);

  await printerInstance.addTextAlign(PrinterConstants.ALIGN_CENTER);
  await printerInstance.addText('RECEIPT');
  await printerInstance.addFeedLine();
  await printerInstance.addTextAlign(PrinterConstants.ALIGN_LEFT);
  await printerInstance.addText('Item 1');
  await printerInstance.addTextAlign(PrinterConstants.ALIGN_RIGHT);
  await printerInstance.addText('$10.00');
  await printerInstance.addFeedLine();
  await printerInstance.addTextAlign(PrinterConstants.ALIGN_LEFT);
  await printerInstance.addText('Item 2');
  await printerInstance.addTextAlign(PrinterConstants.ALIGN_RIGHT);
  await printerInstance.addText('$20.00');
  await printerInstance.addFeedLine();
  await printerInstance.addCut();

  const result = await printerInstance.sendData();
  await printerInstance.disconnect();
  return result;

  if (res) {
    console.log('Printing completed:', res);
    Alert.alert('Success', 'Printing completed successfully');
  }
} catch (error) {
  console.error('Error during printing:', error);
  Alert.alert('Error', `Failed to print: ${error.message}`);
} finally {
  setIsLoading(false);
}

};

return (
<Button
title={isLoading ? 'Printing...' : 'Print Kitchen Order'}
onPress={printReceipt}
disabled={isLoading}
/>
);
};

export default PrintKitchenOrderButton;

Thanks a lot in advance

[sillo1991]

I have the printer connected to the lan and I'm in the same network, is this the issue maybe?

[manage-some]

download this official app of epson from playstore/appstore

TM Utility

Try to discover and test print with from it. If it works with the official app then it should work with this sdk as well. Otherwise your configuration is not right

[sillo1991]

I can print with the epson softwares the test print, but it doesn't work with react-native-esc-pos-printer unfortunately. the error is always Failed to communicate with the devices within the specified time

[tr3v3r]

Have you tried to discover first

[sillo1991]

I didn't, I'm going to try soon and let you know shortly

[sillo1991]

I've done it but I get Permission error.

I also tried to put all the permissions in android\app\src\main\AndroidManifest.xml
at the moment I put these:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

[tr3v3r]

Resolved. The issue was in the running not on a real device.