# Set DND mode (/en/realtime-media/im/build/notifications-and-event-handling/offline-push/set-dnd-mode/flutter) > For AI agents: see the complete documentation index at [llms.txt](/llms.txt). To optimize the user experience when dealing with a large number of push notifications, Chat SDK provides fine-grained settings for push notifications and do not disturb mode at the app and conversation levels. ## Push notification settings [#push-notification-settings-2] | Parameter | Description | App | One-to-one and group chats | | :------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :-- | :------------------------- | | `ALL` | Receive push notifications for all offline messages. | ✓ | ✓ | | `MENTION_ONLY` | Receive push notifications only for mentions. This parameter is recommended for group chats. To mention one or more users, pass `"em_at_list": [ "user1", "user2" ... ]` to the `ext` field when creating a message. To mention all, pass `"em_at_list": "all"` to this field. | ✓ | ✓ | | `NONE` | Do not receive push notifications for offline messages. | ✓ | ✓ | The push notification setting at the conversation level takes precedence over the setting at the app level. For conversations where the push notification setting is not configured, the app setting is used by default. For example, suppose the push notifications for the app are set to `MENTION_ONLY` and the push notifications for a given conversation are set to `ALL`. A user will receive all push notifications from that conversation, but for all other conversations, they will only receive push notifications for messages that mention them. You can specify the DND time period and duration at the app level, and Chat will not send offline push notifications during these two periods. If both the DND time and DND duration are set, the DND mode will take effect for the sum of the two. The following table describes the DND time settings: | Setting | Description | App | One-to-one and group chats | | :--------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :-- | :------------------------- | | `SILENT_MODE_INTERVAL` | The time period for turning on the DND mode, in the `H:MH:M` format, using the 24-hour system and accurate to the minute. For example, `8:30`-`10:0`. The range of hours and minutes in the start time and end time is `[0,23]` and `[0,59]`, respectively. The DND mode is set in the following way: After the start time and end time are set, the DND mode is triggered every day. For example, if the time period is set to `8:0`-`10:0`, the DND mode is effective from 8:00 to 10:00 every day. If you set the start time to `8:0` and the end time to `12:0` at 11:00, the DND mode is effective from 11:00 to 12:00 on the same day, and from 8:00 to 12:00 every day thereafter. If the start time and end time are the same, the DND mode is effective all day. However, if it is set to `0:0`-`0:0`, the DND mode will be turned off. If the end time is earlier than the start time, the DND mode will take effect from the start time of each day to the end time of the next day. For example, if the start time is `10:0` and the end time is `8:0`, the DND mode will take effect from 10:00 on that day to 8:00 on the next day. The DND mode can only be enabled during a specified time period each day. Multiple DND time periods are not supported. The new setting will override the previous setting. If both this parameter and `SILENT_MODE_DURATION` are set, the DND mode will be in effect during both time periods on the day. For example, if `SILENT_MODE_INTERVAL` is set to `8:0`-`10:0` and `SILENT_MODE_DURATION` is set to 240 minutes (4 hours) at 8:00 am, the app will be in DND mode from 8:00-12:00 on that day and from 8:00-10:00 every day thereafter. | ✓ | ✗ | | `SILENT_MODE_DURATION` | The DND duration, in minutes. The value range of the DND duration is `[0,10080]`, where `0` means the parameter is invalid and `10080` means the DND mode lasts for 7 days. Unlike the setting of the DND time period, which takes effect every day, this parameter is valid once. It takes effect immediately after setting. For example, if you set the app-level `SILENT_MODE_DURATION` to 240 minutes (4 hours) at 8:00 am, the app will be in DND mode from 8:00 to 12:00 on the same day. If both this parameter and `SILENT_MODE_INTERVAL` are set, the DND mode will be effective during both time periods on the same day. For example, if the app-level `SILENT_MODE_INTERVAL` is set to 8:00-10:00 at 8:00 am and the DND duration is set to 240 minutes (4 hours), the app will be in DND mode from 8:00-12:00 now and from 8:00-10:00 every day thereafter. | ✓ | ✓ | If you need to push messages to specific users during the DND period or effective time, set [Force push](./configure-push-notifications). For the app and all conversations in the app, the DND setting takes precedence over the push notification setting. For example, suppose a user specifies a DND time period at the app level and sets push notifications to `ALL`. The app enters the DND mode during the specified time period, and the user will not receive any push notifications. Alternatively, suppose a conversation is assigned a DND time period. The app does not have any DND settings and its push notifications are set to `ALL`. During the specified DND time period, the user will not receive any push notifications from this conversation, while push notifications from all other conversations will remain unchanged. ## Set up push notifications for the app [#set-up-push-notifications-for-the-app-3] Call `setSilentModeForAll` to set app-level push notifications. Set push notifications and DND mode by specifying the `ChatSilentModeParam` field, as shown in the following example: ```dart //Set push notification mode to `MENTION_ONLY`. ChatSilentModeParam param = ChatSilentModeParam.remindType(ChatPushRemindType.MENTION_ONLY); //Set the offline push do not disturb timer to 15 minutes. ChatSilentModeParam param = ChatSilentModeParam.silentDuration(15); //Set the do not disturb time period for offline push to 8:30 to 15:00. ChatSilentModeParam param = ChatSilentModeParam.silentModeInterval( startTime: ChatSilentModeTime(hour: 8, minute: 30), endTime: ChatSilentModeTime(hour: 15, minute: 0), ); try { //Set up offline push notifications for the app. await ChatClient.getInstance.pushManager.setSilentModeForAll(param: param); } on ChatError catch (e) {} ``` ## Get the push notification settings of the app [#get-the-push-notification-settings-of-the-app-3] Call `fetchSilentModeForAll` to retrieve the app-level push notification settings, as shown in the following example: ```dart try { ChatSilentModeResult result = await ChatClient.getInstance.pushManager.fetchSilentModeForAll(); // Get the push notification method settings of the app. ChatPushRemindType? remindType = result.remindType; // Get the Unix timestamp of the app's offline push Do Not Disturb expiration. int? timestamp = result.expireTimestamp; // Get the start time of the app's offline push do not disturb time period. ChatSilentModeTime? startTime = result.startTime; // The number of hours in which the quiet time period starts. startTime?.hour; // The number of minutes in the start time of the do not disturb period. startTime?.minute; // Get the end time of the offline push do not disturb time period of the app. ChatSilentModeTime? endTime = result.endTime; // The number of hours in which the quiet time period ends. endTime?.hour; // The number of minutes in the end time of the do not disturb period. endTime?.minute; } on ChatError catch (e) {} ``` ## Set push notifications for a single conversation [#set-push-notifications-for-a-single-conversation-3] Call `setSilentModeForConversation` to set push notifications for a specified conversation. Configure push notifications and the DND mode by specifying the `SilentModeParam` field, as shown in the following example : ```dart //Set push notification mode to `MENTION_ONLY`. ChatSilentModeParam param = ChatSilentModeParam.remindType(ChatPushRemindType.MENTION_ONLY); //Set the offline push do not disturb timer to 15 minutes. ChatSilentModeParam param = ChatSilentModeParam.silentDuration(15); try { //Set the offline push do not disturb mode for the conversation. Currently, it does not support setting the do not disturb time period for the conversation. ChatClient.getInstance.pushManager.setConversationSilentMode( conversationId: conversationId, type: conversationType, stop: stop, ); } on ChatError catch (e) {} ``` ## Get push notification settings for a single conversation [#get-push-notification-settings-for-a-single-conversation-3] Call `fetchConversationSilentMode` to retrieve the push notification setting for a specified conversation, as shown in the following example: ```dart try { //Set the offline push do not disturb mode for the conversation. Currently, it does not support setting the do not disturb time period for the conversation. ChatSilentModeResult result = await ChatClient.getInstance.pushManager.fetchConversationSilentMode( conversationId: conversationId, type: conversationType, ); //Get the push notification method for the conversation. result.remindType; // Get the offline push Do Not Disturb expiration Unix timestamp of the conversation. result.expireTimestamp; } on ChatError catch (e) {} ``` ## Get push notification settings for multiple conversations [#get-push-notification-settings-for-multiple-conversations-3] You can get push notification settings for up to 20 conversations in each call. If a conversation uses app settings or its push notification settings have expired, the returned dictionary does not contain that conversation. Call `fetchSilentModeForConversations` to retrieve push notification settings for multiple conversations, as shown in the following sample: ```dart try { Map map = await ChatClient.getInstance.pushManager.fetchSilentModeForConversations(conversationList); } on ChatError catch (e) {} ``` ## Clear push notification settings for a single conversation [#clear-push-notification-settings-for-a-single-conversation-3] Call `clearRemindTypeForConversation` to clear the push notification type for a specific conversation. After clearing, the conversation will use the app's settings by default: ```dart try { await ChatClient.getInstance.pushManager.removeConversationSilentMode(conversationId: conversationId, type: conversationType); } on ChatError catch (e) {} ```