> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-feature-angular-multimedia-attachments.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Delivery & Read Receipts

> Delivery & Read Receipts — CometChat documentation.

## Mark Messages as Delivered

*In other words, as a recipient, how do I inform the sender that I've received a message?*

You can mark the messages for a particular conversation as read using the `markAsDelivered()` method. This method takes the below parameters as input:

| **messageId** | **The ID of the message above which all the messages for a particular conversation are to be marked as read.**                                                                              |
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| receiverId    | In the case of one-to-one conversation, the sender's sender `UID` will be the receipt's receiver Id. In case of group conversation message's receiver Id will be the receipt's receiver Id. |
| receiverType  | Type of the receiver. Could be either of the two values( user or group)                                                                                                                     |
| messageSender | The UID of the sender of the message.                                                                                                                                                       |

Messages for both user conversation and group conversation can be marked as delivered using this method.

Ideally, you should mark all the messages as read for any conversation when the user opens the chat window for that conversation. This includes two scenarios:

1. **When the list of messages for the conversation is fetched**: In this case you need to obtain the last message in the list of messages and pass the message Id of that message to the markAsDelivered() method.
2. **When the user is on the chat window and a real-time message is received:** In this case you need to obtain the message Id of the message and pass it to the markAsDelivered() method.

<Tabs>
  <Tab title="Swift (User)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "cometchat-uid-2"
    var senderId = "cometchat-uid-1"
    CometChat.markAsDelivered(messageId: messageId, receiverId: receiverId, receiverType: .user, messageSender: senderId)
    ```
  </Tab>

  <Tab title="Swift (Group)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "cometchat-uid-2"
    var senderId = "cometchat-uid-1"
    CometChat.markAsDelivered(messageId: messageId, receiverId: receiverId, receiverType: .group, messageSender: senderId)
    ```
  </Tab>

  <Tab title="Objective C (User)">
    ```objc theme={null}
    [CometChat markAsDeliveredWithMessageId:messageId receiverId:receiverId receiverType: ReceiverTypeUser messageSender:messageSender]
    ```
  </Tab>

  <Tab title="Objective C (Group)">
    ```objc theme={null}
    [CometChat markAsDeliveredWithMessageId:messageId receiverId:receiverId receiverType: ReceiverTypeUser messageSender:messageSender]
    ```
  </Tab>
</Tabs>

This method will mark all the messages before the messageId specified, for the conversation with receiverId and receiverType(user/group) as read.

In case you would like to be notified of an error if the receipts fail to go through you can use `markAsDelivered()` method with the callbacks as shown below:

<Tabs>
  <Tab title="Swift (User)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "cometchat-uid-2"
    var senderId = "cometchat-uid-1"
    CometChat.markAsDelivered(messageId: messageId, receiverId: receiverId, receiverType: .user, messageSender: senderId, onSuccess: {
        print("markAsDelivered Succces")
    }, onError: {(error) in
      print("markAsDelivered error message",error?.errorDescription)
    })
    ```
  </Tab>

  <Tab title="Swift (Group)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "cometchat-uid-2"
    var senderId = "cometchat-uid-1"
    CometChat.markAsDelivered(messageId: messageId, receiverId: receiverId, receiverType: .group, messageSender: senderId, onSuccess: {
        print("markAsDelivered Succces")
    }, onError: {(error) in
      print("markAsDelivered error message",error?.errorDescription)
    })
    ```
  </Tab>

  <Tab title="Objective C (User)">
    ```objc theme={null}
    int messageId = 123;
    NSString *receiverId = @"cometchat-uid-2";
    NSString *senderId = @"cometchat-uid-1";
    [CometChat markAsDeliveredWithMessageId:messageId receiverId:receiverId receiverType: ReceiverTypeUser messageSender:messageSender onSuccess:^{
        NSLog(@"markAsDelivered Success");
    } onError:^(CometChatException *error){
      NSLog(@"markAsDelivered error message %@",[error errorDescription]);
    }];
    ```
  </Tab>

  <Tab title="Objective C (Group)">
    ```objc theme={null}
    int messageId = 123;
    NSString *receiverId = @"cometchat-uid-2";
    NSString *senderId = @"cometchat-uid-1";
    [CometChat markAsDeliveredWithMessageId:messageId receiverId:receiverId receiverType: ReceiverTypeGroup messageSender:messageSender onSuccess:^{
        NSLog(@"markAsDelivered Success");
    } onError:^(CometChatException *error){
      NSLog(@"markAsDelivered error message %@",[error errorDescription]);
    }];
    ```
  </Tab>
</Tabs>

Another option the CometChat SDK provides is to pass the entire message object to the markAsDelivered() method.

<Tabs>
  <Tab title="Swift">
    ```swift theme={null}
    CometChat.markAsDelivered(baseMessage : baseMessage)
    ```
  </Tab>

  <Tab title="Objective C">
    ```objc theme={null}
    [CometChat markAsDeliveredWithBaseMessage:baseMessage];
    ```
  </Tab>
</Tabs>

In case you would like to be notified of an error if the receipts fail to go through you can use `markAsDelivered()` method with the callbacks as shown below:

<Tabs>
  <Tab title="Swift">
    ```swift theme={null}
    CometChat.markAsDelivered(baseMessage : baseMessage, onSuccess: {
        print("markAsDelivered Succces")
    }, onError: {(error) in
      print("markAsDelivered error message",error?.errorDescription)
    })
    ```
  </Tab>

  <Tab title="Objective C">
    ```objc theme={null}
    [CometChat markAsDeliveredWithBaseMessage:baseMessage onSuccess:^{
        NSLog(@"markAsDelivered Success");
    } onError:^(CometChatException *error){
      NSLog(@"markAsDelivered error message %@",[error errorDescription]);
    }];
    ```
  </Tab>
</Tabs>

<Note>
  Starting v3, the messages will not be marked delivered internally by the SDK. You will have to use the `markAsDelivered()` method. You will either have to use one of the above method signatures to mark the messages as delivered.
</Note>

## Mark Messages as Read

*In other words, as a recipient, how do I inform the sender I've read a message?*

You can mark the messages for a particular conversation as read using the `markAsRead()` method. This method takes the below parameters as input:

| Parameter     | Information                                                                                                                                                                         |
| ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| messageId     | The ID of the message above which all the messages for a particular conversation are to be marked as read.                                                                          |
| receiverId    | In case of one to one conversation message's sender `UID` will be the receipt's receiver Id. In case of group conversation message's receiver Id will be the receipts's receiver Id |
| receiverType  | type of the receiver. Could be either of the two values( user or group)                                                                                                             |
| messageSender | The UID of the sender of the message.                                                                                                                                               |

Messages for both User conversation and Groups can be marked as read using this method.

Ideally, you would like to mark all the messages as read for any conversation when the user opens the chat window for that conversation. This includes two scenarios:

1. **When the list of messages for the conversation is fetched**: In this case you need to obtain the last message in the list of messages and pass the message Id of that message to the markAsRead() method.
2. **When the user is on the chat window and a real-time message is received:** In this case you need to obtain the message Id of the message and pass it to the markAsRead() method

<Tabs>
  <Tab title="Swift (User)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "abc"
    var senderId = "xyz"

    CometChat.markAsRead(messageId: messageId, receiverId: receiverId, receiverType: .user, messageSender: senderId)
    ```
  </Tab>

  <Tab title="Swift (Group)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "abc"

    CometChat.markAsRead(messageId: messageId, receiverId: receiverId, receiverType: .group)
    ```
  </Tab>

  <Tab title="Objective C (User)">
    ```objc theme={null}
    int messageId = 123;
    NSString *receiverId = "abc";

    [CometChat markAsReadWithMessageId:messageId receiverId:receiverId receiverType:ReceiverTypeUser];
    ```
  </Tab>

  <Tab title="Objective C (Group)">
    ```objc theme={null}
    int messageId = 123;
    NSString *receiverId = "abc";

    [CometChat markAsReadWithMessageId:messageId receiverId:receiverId receiverType:ReceiverTypeUser];
    ```
  </Tab>
</Tabs>

This method will mark all the messages before the messageId specified, for the conversation with receiverId and receiverType(user/group) as read.

In case you would like to be notified of an error if the receipts fail to go through you can use the `markAsRead()` method with the callbacks as shown below:

<Tabs>
  <Tab title="Swift (User)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "cometchat-uid-2"
    var senderId = "cometchat-uid-1"
    CometChat.markAsRead(messageId: messageId, receiverId: receiverId, receiverType: .user, messageSender: senderId, onSuccess: {
        print("markAsRead Succces")
    }, onError: {(error) in
      print("markAsRead error message",error?.errorDescription)
    })
    ```
  </Tab>

  <Tab title="Swift (Group)">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "cometchat-uid-2"
    var senderId = "cometchat-uid-1"
    CometChat.markAsRead(messageId: messageId, receiverId: receiverId, receiverType: .group, messageSender: senderId, onSuccess: {
        print("markAsRead Succces")
    }, onError: {(error) in
      print("markAsRead error message",error?.errorDescription)
    })
    ```
  </Tab>

  <Tab title="Objective C (User)">
    ```objc theme={null}
    int messageId = 123;
    NSString *receiverId = "abc";

    [CometChat markAsReadWithMessageId:messageId receiverId:receiverId receiverType:ReceiverTypeUser onSuccess:^{
        NSLog(@"markAsRead Success");
    } onError:^(CometChatException *error){
      NSLog(@"markAsRead error message %@",[error errorDescription]);
    }];
    ```
  </Tab>

  <Tab title="Objective C (Group)">
    ```objc theme={null}
    int messageId = 123;
    NSString *receiverId = "abc";

    [CometChat markAsReadWithMessageId:messageId receiverId:receiverId receiverType:ReceiverTypeGroup onSuccess:^{
        NSLog(@"markAsRead Success");
    } onError:^(CometChatException *error){
      NSLog(@"markAsRead error message %@",[error errorDescription]);
    }];
    ```
  </Tab>
</Tabs>

Another option the CometChat SDK provides is to pass the entire message object to the markAsRead() method.

<Tabs>
  <Tab title="Swift">
    ```swift theme={null}
    CometChat.markAsRead(baseMessage : baseMessage)
    ```
  </Tab>

  <Tab title="Objective C">
    ```objc theme={null}
    [CometChat markAsReadWithBaseMessage: baseMessage];
    ```
  </Tab>
</Tabs>

In case you would like to be notified of an error if the receipts fail to go through you can use the `markAsRead()` method with the callbacks as shown below:

<Tabs>
  <Tab title="Swift">
    ```swift theme={null}
    var messageId = 123
    var receiverId = "cometchat-uid-2"
    var senderId = "cometchat-uid-1"
    CometChat.markAsRead(baseMessage : baseMessage, onSuccess: {
        print("markAsRead Succces")
    }, onError: {(error) in
      print("markAsRead error message",error?.errorDescription)
    })
    ```
  </Tab>

  <Tab title="Objective C">
    ```objc theme={null}
    [CometChat markAsReadWithBaseMessage: baseMessage onSuccess:^{
        NSLog(@"markAsRead Success");
    } onError:^(CometChatException *error){
      NSLog(@"markAsRead error message %@",[error errorDescription]);
    }];
    ```
  </Tab>
</Tabs>

<Note>
  Starting v3, the `markAsRead()` method working with v2.x is deprecated and will not work. You will either have to use one of the above method signatures to mark the messages as read.
</Note>

## Receive Delivery & Read Receipts

*In other words, as a recipient, how do I know when a message I sent has been delivered or read by someone?*

### Real-time Receipts

Real-time events for messages of a conversation being read or delivered can be obtained in the `onMessagesRead()` and the `onMessagesDelivered()` methods of the `CometChatMessageDelegate`. In order to receive typing indicators, you must add protocol conformance `CometChatMessageDelegate`.

<Tabs>
  <Tab title="Swift">
    ```swift theme={null}
    func onMessagesRead(receipt: MessageReceipt) {
        
       print("onMessagesRead \(receipt.stringValue())")
     }
        
     func onMessagesDelivered(receipt: MessageReceipt) {
            
      print("onMessagesDelivered \(receipt.stringValue())")
     }
    ```
  </Tab>

  <Tab title="Objective C">
    ```objc theme={null}
    -(void)onMessagesDeliveredWithReceipt:(MessageReceipt *)receipt
    {
       NSLog(@"onMessagesDeliveredWithReceipt %@",receipt.stringValue)
    }
    -(void)onMessagesReadWithReceipt:(MessageReceipt *)receipt
    {
       NSLog(@"onMessagesReadWithReceipt %@",receipt.stringValue)
    }
    ```
  </Tab>
</Tabs>

You will receive events in the form of `MessageReceipt` objects. The message receipt contains the below parameters:

| Parameter    | Information                                                                                                          |
| ------------ | -------------------------------------------------------------------------------------------------------------------- |
| messageId    | The Id of the message prior to which all the messages for that particular conversation have been marked as read.     |
| sender       | User object containing the details of the user who has marked the message as read.                                   |
| receiverId   | Id of the receiver whose conversation has been marked as read.                                                       |
| receiverType | type of the receiver (user/group)                                                                                    |
| receiptType  | Type of the receipt (read/delivered)                                                                                 |
| deliveredAt  | The timestamp of the time when the message was delivered. This will only be present if the receiptType is delivered. |
| readAt       | The timestamp of the time when the message was read. This will only be present when the receiptType is read.         |

While fetching messages in bulk, if the message is a part of a user conversation, the message object will have two fields viz. `deliveredAt` and `readAt` which hold the timestamp for the time the message was delivered and read respectively. using these two variables, the delivery and read status for a user message can be obtained.

However, for a group message, the `deliveredAt` and `readAt` fields are never set and hence to get the status of the message you can use the below-described method.

### Missed Receipts

You will receive message receipts when you load offline messages. For groups, we do not include the list the users that have received it. You need to call the `getMessageReceipts()` method for it.

### Receipt History for a Single Message

In order to fetch the message receipts, you can use the `getMessageReceipts()` method.

<Tabs>
  <Tab title="Swift">
    ```swift theme={null}
    var messageId = 10101;

    CometChat.getMessageReceipts(messageId, onSuccess: { (receipt) in
                
      print("getMessageReceipt \(receipt)")                                           
    }) { (error) in
      print(error?.errorDescription)
    }
    ```
  </Tab>

  <Tab title="Objective C">
    ```objc theme={null}
    int messageId =10101;

    [CometChat getMessageReceipts:messageId onSuccess:^(NSArray<MessageReceipt *> * _Nonnull receipt) {
            
            NSLog(@"getMesssageReceipts %@",receipt);
        } onError:^(CometChatException * _Nullable error) {
            
            NSLog(@"CometChatException %@",error.errorDescription);
        }];
    ```
  </Tab>
</Tabs>

You will receive a list of `MessageReceipt` objects in the `onSuccess()` method.