From a high-level perspective, DeviceService completely abstracts the functionality of a particular service/protocol (webOS TV, Netcast TV, Chromecast, Roku, DIAL, etc).
DeviceService is an abstract class that is meant to be extended. You shouldn’t ever use DeviceService directly, unless extending it to provide support for an additional service/protocol.
Immediately after discovery of a DeviceService, DiscoveryManager will set the DeviceService’s delegate to the ConnectableDevice that owns the DeviceService. You should not change the delegate unless you intend to manage the lifecycle of that service. The DeviceService will proxy all of its delegate method calls through the ConnectableDevice’s ConnectableDeviceDelegate.
Connection & Pairing¶
Your ConnectableDevice object will let you know if you need to connect or pair to any services.
All DeviceService objects have a group of capabilities. These capabilities can be implemented by any object, and that object will be returned when you call the DeviceService’s capability methods (launcher, mediaPlayer, volumeControl, etc).
- id<DeviceServiceDelegate> delegate
- Delegate object to receive DeviceService status messages. See note in the “In Depth” section about changing the DeviceServiceDelegate.
- ServiceDescription * serviceDescription
- Object containing the discovered information about this DeviceService
- ServiceConfig * serviceConfig
- Object containing persistence data about this DeviceService (pairing info, SSL certificates, etc)
- NSString * serviceName
- Name of the DeviceService (webOS, Chromecast, etc)
- NSArray * capabilities
An array of capabilities supported by the DeviceService. This array may change based off a number of factors.
- DiscoveryManager’s pairingLevel value
- Connect SDK framework version
- First screen device OS version
- First screen device configuration (apps installed, settings, etc)
- Physical region
- BOOL connected
- Whether the DeviceService is currently connected
- BOOL isConnectable
- Whether the DeviceService requires an active connection or registration process
- BOOL requiresPairing
- Whether the DeviceService requires pairing or not.
- DeviceServicePairingType pairingType
- Type of pairing that this DeviceService requires. May be unknown until you try to connect.
- id pairingData
- May contain useful information regarding pairing (pairing key length, etc)
- + (NSDictionary *) discoveryParameters
- A dictionary of keys/values that will be used by the DiscoveryProvider used to discover this DeviceService. Some keys that are used are: service name, SSDP filter, etc.
- + (DeviceService *) deviceServiceWithClass:(Class)_class serviceConfig:(ServiceConfig *)serviceConfig
- serviceConfig: serviceConfig
- + (BOOL) shouldDisconnectOnBackground
Static property that determines whether a DeviceService subclass should shut down communication channels when the app enters a background state. This may be helpful for apps that need to communicate with web apps from the background. This property may not be applicable to all DeviceService subclasses.
Sets the shouldDisconnectOnBackground static property. This property should be set before starting DiscoveryManager for the first time.
- + (void) setShouldDisconnectOnBackround:(BOOL)shouldDisconnectOnBackground
- - (instancetype) initWithServiceConfig:(ServiceConfig *)serviceConfig
- - (BOOL) hasCapability:(NSString *)capability
- - (BOOL) hasCapabilities:(NSArray *)capabilities
- - (BOOL) hasAnyCapability:(NSArray *)capabilities
- - (void) connect
- Will attempt to connect to the DeviceService. The failure/success will be reported back to the DeviceServiceDelegate. If the connection attempt reveals that pairing is required, the DeviceServiceDelegate will also be notified in that event.
- - (void) disconnect
- Will attempt to disconnect from the DeviceService. The failure/success will be reported back to the DeviceServiceDelegate.
- - (void) pairWithData:(id)pairingData
Will attempt to pair with the DeviceService with the provided pairingData. The failure/success will be reported back to the DeviceServiceDelegate.
Data to be used for pairing. The type of this parameter will vary depending on what type of pairing is required, but is likely to be a string (pin code, pairing key, etc).
- - (void) closeLaunchSession:(LaunchSession *)launchSession success:(SuccessBlock)success failure:(FailureBlock)failure
Every LaunchSession object has an associated DeviceService. Internally, LaunchSession’s close method proxies to it’s DeviceService’s closeLaunchSession method. If, for some reason, your LaunchSession loses it’s DeviceService reference, you can call this closeLaunchSession method directly.
- launchSession – LaunchSession to be closed
- success: success – (optional) SuccessBlock to be called on success
- failure: failure – (optional) FailureBlock to be called on failure