#import @class MTSignal; @class MTContext; @class MTSocksProxySettings; @interface MTProxyConnectivityStatus : NSObject @property (nonatomic, readonly) bool reachable; @property (nonatomic, readonly) NSTimeInterval roundTripTime; @end @interface MTProxyConnectivity : NSObject + (MTSignal *)pingProxyWithContext:(MTContext *)context datacenterId:(NSInteger)datacenterId settings:(MTSocksProxySettings *)settings; @end