react-native-zeroconf

Basic Zeroconf implementation for React-native

Get running services advertizing themselves using Zeroconf implementations like Avahi, Bonjour or NSD.

Install

yarn add react-native-zeroconf
# for react-native < 0.60 only (all platforms):
react-native link
# for ios (when using CocoaPods): 
(cd ios && pod install)

You can look at the wiki if you prefer a manual install.

TXT records will be available on iOS and Android >= 7.

For Android please ensure your manifest is requesting all necessary permissions.

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />

IOS 14 Permissions

IOS 14 requires you to specify the services you want to scan for and a description for what you're using them.

In your info.plist add the following strings:

<key>NSBonjourServices</key>
    <array>
        <string>my_service._tcp.</string>
        <string>my_other_service._tcp.</string>
    </array>
<key>NSLocalNetworkUsageDescription</key>
<string>Describe why you want to use local network discovery here</string>

Example

Take a look at the example folder. Install the dependencies, run node server.js and launch the project.

API

import Zeroconf from 'react-native-zeroconf'
const zeroconf = new Zeroconf()

Methods

scan(type = 'http', protocol = 'tcp', domain = 'local.') Start the zeroconf scan

This will initialize the scan from the Zeroconf instance. Will stop another scan if any is running.

stop() Stop the scan

If any scan is running, stop it. Otherwise do nothing.

getServices() Returns resolved services

Will return all names of services that have been resolved.

removeDeviceListeners() Remove listeners

Allow you to clean the listeners, avoiding potential memory leaks (#33).

addDeviceListeners() Add listeners

If you cleaned the listeners and need to get them back on.

publishService(type, protocol, domain, name, port, txt) Publish a service

This adds a service for the current device to the discoverable services on the network.

domain should be the domain the service is sitting on, dot suffixed, for example 'local.' type should be both type and protocol, underscore prefixed, for example '_http._tcp' name should be unique to the device, often the device name port should be an integer txt should be a hash, for example {"foo": "bar"}

unpublishService(name) Unpublish a service

This removes a service from those discoverable on the network.

name should be the name used when publishing the service

Events

zeroconf.on('start', () => console.log('The scan has started.'))

start Triggered on scan start

stop Triggered on scan stop

found Triggered when a service is found

Broadcast a service name as soon as it is found.

resolved Triggered when a service is resolved

Broadcast a service object once it is fully resolved

{
  "host": "XeroxPrinter.local.",
  "addresses": [
    "192.168.1.23",
    "fe80::aebc:123:ffff:abcd"
  ],
  "name": "Xerox Printer",
  "fullName": "XeroxPrinter.local._http._tcp.",
  "port": 8080
}

remove Triggered when a service is removed

Broadcast a service name removed from the network.

update Triggered either when a service is found or removed

error Triggered when an error occurs