[ECO-4698] Fix presence according to reference implementation

Source/ARTPresenceMessage.m

@@ -10,15 +10,13 @@ - (instancetype)init {
     if (self) {
         // Default
         _action = ARTPresenceEnter;
-        _syncSessionId = 0;
     }
     return self;
 }
 
 - (id)copyWithZone:(NSZone *)zone {
     ARTPresenceMessage *message = [super copyWithZone:zone];
     message->_action = self.action;
-    message->_syncSessionId = self.syncSessionId;
     return message;
 }
 
@@ -27,7 +25,6 @@ - (NSString *)description {
     [description deleteCharactersInRange:NSMakeRange(description.length - (description.length>2 ? 2:0), 2)];
     [description appendFormat:@",\n"];
     [description appendFormat:@" action: %lu,\n", (unsigned long)self.action];
-    [description appendFormat:@" syncSessionId: %lu\n", (unsigned long)self.syncSessionId];
     [description appendFormat:@"}"];
     return description;
 }
@@ -73,28 +70,6 @@ - (NSInteger)indexFromId {
     return index;
 }
 
-- (BOOL)isNewerThan:(ARTPresenceMessage *)latest {
-    if (latest == nil) {
-        return YES;
-    }
-
-    if ([self isSynthesized] || [latest isSynthesized]) {
-        return !self.timestamp || [latest.timestamp timeIntervalSince1970] <= [self.timestamp timeIntervalSince1970];
-    }
-
-    NSInteger currentMsgSerial = [self msgSerialFromId];
-    NSInteger currentIndex = [self indexFromId];
-    NSInteger latestMsgSerial = [latest msgSerialFromId];
-    NSInteger latestIndex = [latest indexFromId];
-
-    if (currentMsgSerial == latestMsgSerial) {
-        return currentIndex > latestIndex;
-    }
-    else {
-        return currentMsgSerial > latestMsgSerial;
-    }
-}
-
 #pragma mark - NSObject
 
 - (BOOL)isEqual:(id)object {

Source/ARTRealtimeChannel.m

@@ -578,14 +578,14 @@ - (void)performTransitionToState:(ARTRealtimeChannelState)state withParams:(ARTC
             break;
         case ARTRealtimeChannelDetached:
             self.channelSerial = nil; // RTP5a1
-            [self.presence failsSync:params.errorInfo];
+            [self.presence failsSync:params.errorInfo]; // RTP5a
             break;
         case ARTRealtimeChannelFailed:
             self.channelSerial = nil; // RTP5a1
             self.attachResume = false;
             [_attachedEventEmitter emit:nil with:params.errorInfo];
             [_detachedEventEmitter emit:nil with:params.errorInfo];
-            [self.presence failsSync:params.errorInfo];
+            [self.presence failsSync:params.errorInfo]; // RTP5a
             break;
         default:
             break;
@@ -726,17 +726,17 @@ - (void)detachChannel:(ARTChannelStateChangeParams *)params {
     if (self.state_nosync == ARTRealtimeChannelDetached) {
         return;
     }
-    [self failPendingPresenceWithState:params.state info:params.errorInfo];
+    [self failPendingPresenceWithState:params.state info:params.errorInfo]; // RTP5a
     [self performTransitionToState:ARTRealtimeChannelDetached withParams:params];
 }
 
 - (void)setFailed:(ARTChannelStateChangeParams *)params {
-    [self failPendingPresenceWithState:params.state info:params.errorInfo];
+    [self failPendingPresenceWithState:params.state info:params.errorInfo]; // RTP5a
     [self performTransitionToState:ARTRealtimeChannelFailed withParams:params];
 }
 
 - (void)setSuspended:(ARTChannelStateChangeParams *)params {
-    [self failPendingPresenceWithState:params.state info:params.errorInfo];
+    [self failPendingPresenceWithState:params.state info:params.errorInfo]; // RTP5f
     [self performTransitionToState:ARTRealtimeChannelSuspended withParams:params];
 }