SwiftSSDP

Simple Service Discovery Protocol (SSDP) session based discovery package for Swift.

Package Management

Installation

Using Swift Package Manager

SwiftSSDP is available through Swift Package Manager. To install it, add the following line to your Package.swift dependencies:

.Package(url: "https://github.com/pryomoax/SwiftSSDP.git", majorVersion: 0, minor: 5)

Using Carthage

SwiftSSDP is available through Carthage. To install it, add the following line to your Cartfile:

# SwiftSSDP
github "pryomoax/SwiftSSDP.git" ~> 0.5

Using CocoaPods

SwiftSSDP is currently not supported by CocoaPods (coming soon)

Usage

SSDP can be used for many things, discovering devices or services. Sonos uses SSDP for device discovery and using the urn:schemas-upnp-org:device:ZonePlayer:1 search target (ST) devices can be discovered and inspected.

Below is a simple class to start and stop Sonos device discovery. It uses a 10 second timeout, which will automatically close the discovery session session if not closed explictly.

SSDP makes use of UDP, which is an unreliable transport, and even less reliable over WiFi. SwiftSSDP automatically repeats MSEARCH broadcasts to ensure discovery of all devices. SwiftSSDP gradually backs off the interval between MSEARCH broadcasts are sent from 1/second to 1/minute. Discovery should be short lived as not to flood the network with broadcasts. Without a timeout the session should be closed explictly.

Timed Sessions

public class DeviceDiscovery {

	private let discovery: SSDPDiscovery = SSDPDiscovery.defaultDiscovery
	fileprivate var session: SSDPDiscoverySession?

	public func searchForDevices() {
		// Create the request for Sonos ZonePlayer devices
		let zonePlayerTarget = SSDPSearchTarget.deviceType(schema: SSDPSearchTarget.upnpOrgSchema, deviceType: "ZonePlayer", version: 1)
		let request = SSDPMSearchRequest(delegate: self, searchTarget: zonePlayerTarget)
    
		// Start a discovery session for the request and timeout after 10 seconds of searching.
		self.session = try! discovery.startDiscovery(request: request, timeout: 10.0)
	}
	
	public func stopSearching() {
		self.session?.close()
		self.session = nil
	}
	
}

To handle the discovery implement the SSDPDiscoveryDelegate protocol, and use when initializing a SSDPMSearchReqest

extension DeviceDiscovery: SSDPDiscoveryDelegate {
    
	public func discoveredDevice(response: SSDPMSearchResponse, session: SSDPDiscoverySession) {
       print("Found device \(response)\n")
   }
    
   public func discoveredService(response: SSDPMSearchResponse, session: SSDPDiscoverySession) {
   }
    
   public func closedSession(_ session: SSDPDiscoverySession) {
       print("Session closed\n")
   }

}

Logging

SwiftSSDP uses SwiftAbstractLogger for all logging. Logging can be independently configured for SwiftSSDP using the log category "SSDP". For convenience this is accessible via the loggerDiscoveryCategory constant.

// Attach a default (basic) console logger implementation to Logger
Logger.attach(BasicConsoleLogger.logger)

// Enable debug logging only for SSDPSwift
Logger.configureLevel(category: loggerDiscoveryCategory, level: .Debug)

Package Information

Requirements

• Xcode 8
• iOS 10.0+

Author

Paul Bates, paul.a.bates@gmail.com

License

SwiftSSDP is available under the MIT license. See the LICENSE file for more