Added Ping method

ObjectiveDDP/MeteorClient.h

@@ -52,6 +52,7 @@ typedef void(^MeteorClientMethodCallback)(NSDictionary *response, NSError *error
 - (void)removeSubscription:(NSString *)subscriptionName;
 - (void)logout;
 - (void)disconnect;
+- (void)ping;
 
 // Deprecated methods
 

ObjectiveDDP/MeteorClient.m

@@ -174,6 +174,13 @@ - (void)disconnect {
     [self.ddp disconnectWebSocket];
 }
 
+- (void)ping {
+    if (!self.connected) {
+        return;
+    }
+    [self.ddp ping:[BSONIdGenerator generate]];
+}
+
 #pragma mark <ObjectiveDDPDelegate>
 
 - (void)didReceiveMessage:(NSDictionary *)message {

ObjectiveDDP/ObjectiveDDP.h

@@ -9,6 +9,7 @@
 @property (nonatomic, assign) id <ObjectiveDDPDelegate> delegate;
 @property (nonatomic, strong) SRWebSocket *webSocket;
 
+- (void)ping:(NSString *)id;
 - (void)pong:(NSString *)id;
 
 - (id)initWithURLString:(NSString *)urlString delegate:(id <ObjectiveDDPDelegate>)delegate;

ObjectiveDDP/ObjectiveDDP.m

@@ -27,6 +27,16 @@ - (void)disconnectWebSocket {
     [self _closeConnection];
 }
 
+//ping (client -> server):
+//  id: string (the id for the ping)
+- (void)ping:(NSString *)id {
+    NSDictionary *fields = @{@"msg": @"ping"};
+    if (id)
+        fields = @{@"msg": @"ping", @"id": id};
+    NSString *json = [self _buildJSONWithFields:fields parameters:nil];
+    [self.webSocket send:json];
+}
+
 //pong (client -> server):
 //  id: string (the id send with the ping)
 - (void)pong:(NSString *)id {