react-native-citizen-escposprinter

react-native-citizen-escposprinter

A React Native wrapper of the Citizen ECSPOSPrinter SDK, supporting the New Architecture and classic builds.

The current version embeds these SDKs:

• CSJAndroidPOSSDK_V212E.zip
• CSJiOSSwiftSDK_V212E.zip

Usage

Most of the methods are a simple wrapper of the native SDK. For a complete list of methods and their details, you may refer to the PDF manual inside the Citizen SDK.

import {
  connect,
  ESCPOSConst,
  searchCitizenPrinters,
} from "react-native-citizen-escposprinter";

const main = async () => {
  const results = await searchCitizenPrinters(
    ESCPOSConst.CMP_PORT_WiFi,
  );
  console.info("Found printers:", results);

  const printer = await connect(
    ESCPOSConst.CMP_PORT_WiFi,
    results[0].ipAddress
  );
  await printer.printText("Hello World!\n");
  await printer.cutPaper(ESCPOSConst.CMP_CUT_FULL_PREFEED);
  await printer.disconnect();
};

⚠️ Known Issues

Error RCTEvents.receiveEvent() is not registered

tl;dr Do not use index.tsx as your entrypoint, use something like app.tsx instead.

This error happens when all of the following conditions are met:

• You have expo-router installed
• You have new architecture enabled
• You are using index.tsx as your entrypoint

When expo-router's own modified entrypoint sees your index.tsx, it will be confused and incorrectly overrides some native modules.

Partial USB Support

USB connections without specified a serial number is supported and tested in the following environments (see #7):

• Android in "old" architecture
• Android in New Architecture

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

If you use this library at work, consider sponsoring for a first-class technical support.