Can't find printer device

[damathryx]

Description

Unable to Discover Network Printer (Epson TM-T82X)

Platform: Android

---

Description

Does not detect an Epson TM-T82X printer connected via Ethernet. The printer is reachable and can successfully receive and print raw ESC/POS commands over TCP, but the library fails to discover it.

---

What Works

• Printer is on the same local network as the Android and macOS devices.

• IP is reachable via ping or TCP tools.

• Raw print works via command-line:

  echo -e $'\x1B\x40Test\n\n\n\x1D\x56\x41' | nc 192.168.254.121 9100

• Epson utility apps can connect

• We're using version 2.5.1 before we updated all dependencies and it works

---

Environment

react-native-esc-pos-printer: 4.4.3
React Native: 0.80.1
Device: Lenovo Tablet / Pixel Emulator
Printer: Epson TM-T82X (Ethernet)

Steps to reproduce

What Fails

•   await PrintersDiscovery.start({
    	timeout: 2000,
    	filterOption: {
    		deviceModel: DiscoveryFilterOption.MODEL_ALL,
    	},
    });
  

• PrintersDiscovery.onDiscovery is not triggered

• 
  const { start, isDiscovering, printers } =
    usePrintersDiscovery();
  
    useEffect(() => {
      start();
    }, []);
    
  

printers returns empty array

---

react-native-esc-pos-printer version

4.4.3

React Native version

0.80.1

Platforms

Android

Workflow

None

Architecture

None

Build type

None

Device

None

Device model

Lenovo tablet

Acknowledgements

Yes

[tr3v3r]

Hello @damathryx,

I've never checked the lib with RN version 0.80+. But there are a couple of points you can verify:

1. Make sure you've completed all steps from this section
2. Check logs in Android Studio when you run "start" discovery process. It might help us to find the root cause

[damathryx]

Hi @tr3v3r I have checked and the permissions are already added.
I also checked the logs using adb and I don't see any thing related to the start process.

[damathryx]

@tr3v3r I am able to find the error it's returned by printerError
PrinterDiscoveryError: An unknown error occurred

[damathryx]

PrintersDiscovery.start({
		timeout: 2000,
		filterOption: {
			deviceModel: DiscoveryFilterOption.MODEL_ALL,
		},
	});

After removing the filterOption and timeout
I'm now getting this error

error: PrinterDiscoveryError: Tried to start search when search had been already done.
Bluetooth is OFF
There is no permission for the position information

However, bluetooth is on and permissions are granted.

My manifest file permissions

    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.CAMERA" />
  
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <!-- Request legacy permissions on older devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH"
        android:maxSdkVersion="30"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
        android:maxSdkVersion="30"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="18"/>

permission. granted

[damathryx]

Also tried to test the example project to check if that will work there but I'm getting some build errors like
error: cannot find symbol if (epos2Printer_ == null) throw new Epos2Exception(Epos2Exception.ERR_MEMORY);

[amazing4u]

@damathryx I also could not get the test example project to work, so i created my own sample app. You can try it here:
#230 (comment)