[[[_conversationDBRef queryOrderedByChild:@"time"] queryStartingAtValue:@(time)] observeSingleEventOfType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {

        for (FIRDataSnapshot* child in snapshot.children) {
            NSDictionary* msgData = child.value;
            NSLog(@"msgData: %@", msgData);
        }
    }];

(lldb) po _conversationDBRef
https://xxxxx-xxxxxx.firebaseio.com/Strike-Fighter/messages/4_5

(lldb) po [[_conversationDBRef queryOrderedByChild:@"time"] queryStartingAtValue:@(time)]
(/Strike-Fighter/messages/4_5 {
    i = time;
    sp = "548914514.2122542";
})

[[[_conversationDBRef queryWhereField:@"time" isGreaterThan:@100000]
    queryOrderedByField:@"population"];