RxBonjour

Additional

Language
Kotlin
Version
2.0.0-RC1 (Sep 28, 2017)
Created
May 7, 2015
Updated
Oct 29, 2017
Owner
Marcel Schnelle (mannodermaus)
Contributors
Kiran Rao (curioustechizen)
i906
Ivan Baranov (IvBaranov)
Marcel Schnelle (mannodermaus)
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RxBonjour

A reactive wrapper around network service discovery functionalities for Kotlin and Java.

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RxBonjour 2 is available on jcenter() and consists of three distinct components, all of which are detailed below.

// Always include this
implementation "de.mannodermaus.rxjava2:rxbonjour:2.0.0-RC1"

// Example: Usage on Android with JmDNS
implementation "de.mannodermaus.rxjava2:rxbonjour-platform-android:2.0.0-RC1"
implementation "de.mannodermaus.rxjava2:rxbonjour-driver-jmdns:2.0.0-RC1"

For the (less flexible & Android-only) RxJava 1 version, have a look at the 1.x branch.

Components

RxBonjour 2 is composed of a core library, a Platform to run on, and a Driver to access the NSD stack.

Core Library (rxbonjour)

The main entry point to the API, RxBonjour is contained in this library. All other libraries depend on this common core.

Platform Library (rxbonjour-platform-xxx)

Provides access to the host device's IP and Network controls. During the creation of your RxBonjour instance, you attach exactly 1 implementation of the Platform interface.

Below is a list of available Platform libraries supported by RxBonjour 2:

Group Artifact Description
de.mannodermaus.rxjava2 rxbonjour-platform-android Android-aware Platform, utilizing WifiManager APIs
de.mannodermaus.rxjava2 rxbonjour-platform-desktop Default JVM Platform

About the AndroidPlatform

When running on Android, the rxbonjour-platform-android has to be applied to the module. Doing so will add the following permissions to your AndroidManifest.xml:

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

Driver Library (rxbonjour-driver-xxx)

Provides the connection to a Network Service Discovery stack. During the creation of your RxBonjour instance, you attach exactly 1 implementation of the Driver interface.

Below is a list of available Driver libraries supported by RxBonjour 2:

Group Artifact Description
de.mannodermaus.rxjava2 rxbonjour-driver-jmdns Service Discovery with JmDNS
de.mannodermaus.rxjava2 rxbonjour-driver-nsdmanager Service Discovery with Android's NsdManager APIs

Usage

Creation

Configure a RxBonjour service object using its Builder, attaching your desired Platform and Driver implementations. If you forget to provide either dependency, an Exception will be thrown:

val rxBonjour = RxBonjour.Builder()
    .platform(AndroidPlatform.create(this))
    .driver(JmDNSDriver.create())
    .create()

Your RxBonjour is ready for use now!

Discovery

Create a network service discovery request using RxBonjour#newDiscovery(String):

val disposable = rxBonjour.newDiscovery("_http._tcp")
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(
        { event ->
            when(event) {
                is BonjourEvent.Added -> println("Resolved Service: ${event.service}")
                is BonjourEvent.Removed -> println("Lost Service: ${event.service}")
            }
        },
        { error -> println("Error during Discovery: ${error.message}") }
    )

Make sure to off-load this work onto a background thread, since the library won't enforce any threading. In this example, RxAndroid is utilized to return the events back to Android's main thread.

Registration

Configure your advertised service & start the broadcast using RxBonjour#newBroadcast(BonjourBroadcastConfig). The only required property to set on a BonjourBroadcastConfig is its Bonjour type, the remaining parameters are filled with defaults as stated in the comments below:

val broadcastConfig = BonjourBroadcastConfig(
        type = "_http._tcp",
        name = "My Bonjour Service",        // default: "RxBonjour Service"
        address = null,                     // default: Fallback to WiFi address provided by Platform
        port = 13337,                       // default: 80
        txtRecords = mapOf(                 // default: Empty Map
                "my.record" to "my value",
                "other.record" to "0815"))
                
val disposable = rxBonjour.newBroadcast(broadcastConfig)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe()

The broadcast is valid until the returned Completable is unsubscribed from. Again, make sure to off-load this work onto a background thread like above, since the library won't do it for you.

License

Copyright 2017 Marcel Schnelle

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.