@leesiongchan/react-native-esc-pos

React Native ESC/POS module

A React Native ESC/POS module to help you connect to your ESC/POS printer easily. It also has provide an intuitive way to design your layout, check below example to see how easy to get your layout ready!

PS: iOS IS NOT IMPLEMENTED YET

Getting started

$ yarn add @leesiongchan/react-native-esc-pos

PS: Skip below installation guide if you are using React Native >= 0.60

Mostly automatic installation

$ react-native link @leesiongchan/react-native-esc-pos

Manual installation

iOS

1. In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
2. Go to node_modules ➜ @leesiongchan ➜ react-native-esc-pos and add EscPos.xcodeproj
3. In XCode, in the project navigator, select your project. Add libEscPos.a to your project's Build Phases ➜ Link Binary With Libraries
4. Run your project (Cmd+R)

Android

1. Open up android/app/src/main/java/[...]/MainApplication.java

• Add import leesiongchan.reactnativeescpos.EscPosPackage; to the imports at the top of the file
• Add new EscPosPackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-esc-pos'
   project(':react-native-esc-pos').projectDir = new File(rootProject.projectDir, 	'../node_modules/@leesiongchan/react-native-esc-pos/android')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-esc-pos')
   

Android Bluetooth Permission

Add following permissions into AndroidManifest.xml

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

Usage

import EscPos from "@leesiongchan/react-native-esc-pos";

const design = `
D0004           {<>}           Table #: A1
------------------------------------------
[ ] Espresso
    - No sugar, Regular 9oz, Hot
                              {H3} {R} x 1
------------------------------------------
[ ] Blueberry Cheesecake
    - Slice
                              {H3} {R} x 1

{QR[Where are the aliens?]}
{BC[Your barcode here]}
{IMG[file://image/path/file.png]}
`;

async function testPrinter() {
  try {
    // Can be `network` or `bluetooth`
    EscPos.setConfig({ type: "network" });

    // Connects to your printer
    // If you use `bluetooth`, second parameter is not required.
    await EscPos.connect("10.10.10.10", 9100);

    // Once connected, you can setup your printing size, either `PRINTING_SIZE_58_MM`, `PRINTING_SIZE_76_MM` or `PRINTING_SIZE_80_MM`
    EscPos.setPrintingSize(EscPos.PRINTING_SIZE_80_MM);
    // 0 to 8 (0-3 = smaller, 4 = default, 5-8 = larger)
    EscPos.setTextDensity(8);
    // Test Print
    await EscPos.printSample();
    // Cut half!
    await EscPos.cutPart();
    // You can also print image! eg. "file:///longpath/xxx.jpg"
    await EscPos.printImage(file.uri);
    // You can also print image with a specific width offset (scale down image by offset pixels)! eg. "file:///longpath/xxx.jpg"
    await EscPos.printImageWithOffset(file.uri, offset);
    // Print your design!
    await EscPos.printDesign(design);
    // Print QR Code, you can specify the size
    await EscPos.printQRCode("Proxima b is the answer!", 200);
    // Print Barcode
    // printBarCode({code}, {type}, {width}, {height}, {font}, {fontPosition})
    // type: 65=UPC-A; 66=UPC-E; 67=EAN13; 68=EAN8; 69=CODE39; 70=ITF; 71=CODABAR; 72=CODE93; 73=CODE128}
    // width: 2-6
    // height: 0-255
    // font: 0=FontA; 1=FontB
    // fontPosition: 0=none; 1=top; 2=bottom; 3=top-bottom
    await EscPos.printBarcode("Your barcode here", 73, 3, 100, 0, 2);
    // Cut full!
    await EscPos.cutFull();
    // Beep!
    await EscPos.beep();
    // Kick the drawer! Can be either `kickCashDrawerPin2` or `kickCashDrawerPin5`
    await EscPos.kickCashDrawerPin2();
    // Disconnect
    await EscPos.disconnect();
  } catch (error) {
    console.error(error);
  }
}

Scan for available bluetooth devices

EscPos.scanDevices();

Stop scanning

EscPos.stopScan();

Events

EscPos.addListener("bluetoothDeviceFound", (event) => {
  if (event.state === EscPos.BLUETOOTH_DEVICE_FOUND) {
    console.log("Device Found!");
    console.log("Device Name : " + event.deviceInfo.name);
    console.log("Device MAC Address : " + event.deviceInfo.macAddress);
  }

To listen to bluetooth state changes:

EscPos.addListener("bluetoothStateChanged", (event) => {
  if (event.state === EscPos.BLUETOOTH_CONNECTED) {
    console.log("Device Connected!");
    console.log("Device Name : " + event.deviceInfo.name);
    console.log("Device MAC Address : " + event.deviceInfo.macAddress);
  }
});

Constants

• EscPos.PRINTING_SIZE_58_MM
• EscPos.PRINTING_SIZE_78_MM
• EscPos.PRINTING_SIZE_80_MM
• EscPos.BLUETOOTH_CONNECTED
• EscPos.BLUETOOTH_DISCONNECTED

Design Tags

Tag	Description
{B}	Bold.
{U}	Underline.
{H1}	Font Size. 2x2 / char
{H2}	Font Size. 1x2 / char
{H3}	Font Size. 2x1 / char
{LS:?}	Linespace. M = 24LS, L = 30LS
{C}	Align text to center.
{R}	Align text to right.
{RP:?:?}	Repeat text. Eg. {RP:5:a} will output "aaaaa".
{BC[?]}	Print barcode.
{QR[?]}	Print QR code.
{IMG[?]}	Print image from a path.
{IMG[?]:?}	Print image scaled down to make space for a width offset. Eg. {IMG[]:32}
{<>}	Left-right text separation.
{---}	Create a "---" separator.
{===}	Create a "===" separator.

TODO

• [x] Android support
• [ ] iOS support
• [x] Print barcode
• [ ] Add TypeScript support
• [x] Bluetooth support
• [ ] Serial port support
• [ ] Add test
• [x] Listen to the connection status