diff --git a/src/api_data/server_config.rs b/src/api_data/server_config.rs
index 80bfe87..7bbb8b9 100644
--- a/src/api_data/server_config.rs
+++ b/src/api_data/server_config.rs
@@ -3,7 +3,7 @@
 //! @author Pierre Hubert
 use serde::Serialize;
 
-use crate::constants::{ALLOWED_CONVERSATION_FILES_TYPES, conservation_policy, CONVERSATION_FILES_MAX_SIZE, MAX_CONVERSATION_MESSAGE_LENGTH, MIN_CONVERSATION_MESSAGE_LENGTH, MIN_SUPPORTED_MOBILE_VERSION, password_policy};
+use crate::constants::{ALLOWED_CONVERSATION_FILES_TYPES, conservation_policy, CONVERSATION_FILES_MAX_SIZE, CONVERSATION_WRITING_EVENT_INTERVAL, CONVERSATION_WRITING_EVENT_LIFETIME, MAX_CONVERSATION_MESSAGE_LENGTH, MIN_CONVERSATION_MESSAGE_LENGTH, MIN_SUPPORTED_MOBILE_VERSION, password_policy};
 use crate::data::config::conf;
 
 #[derive(Serialize)]
@@ -37,10 +37,13 @@ pub struct ServerConfig {
     android_direct_download_url: String,
     password_policy: PasswordPolicy,
     data_conservation_policy: DataConservationPolicy,
+
     min_conversation_message_len: usize,
     max_conversation_message_len: usize,
     allowed_conversation_files_type: [&'static str; 17],
     conversation_files_max_size: usize,
+    conversation_writing_event_interval: u64,
+    conversation_writing_event_lifetime: u64,
 }
 
 impl ServerConfig {
@@ -56,6 +59,8 @@ impl ServerConfig {
             max_conversation_message_len: MAX_CONVERSATION_MESSAGE_LENGTH,
             allowed_conversation_files_type: ALLOWED_CONVERSATION_FILES_TYPES,
             conversation_files_max_size: CONVERSATION_FILES_MAX_SIZE,
+            conversation_writing_event_interval: CONVERSATION_WRITING_EVENT_INTERVAL,
+            conversation_writing_event_lifetime: CONVERSATION_WRITING_EVENT_LIFETIME,
 
             password_policy: PasswordPolicy {
                 allow_email_in_password: password_policy::ALLOW_EMAIL_IN_PASSWORD,
diff --git a/src/constants.rs b/src/constants.rs
index c4848de..b6d29a4 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -191,4 +191,10 @@ pub const ALLOWED_CONVERSATION_FILES_TYPES: [&str; 17] = [
 ];
 
 /// File maximum size in conversations (10 Mb)
-pub const CONVERSATION_FILES_MAX_SIZE: usize = 10 * 1024 * 1024;
\ No newline at end of file
+pub const CONVERSATION_FILES_MAX_SIZE: usize = 10 * 1024 * 1024;
+
+/// Minimum interval before notifying again that someone is writing
+pub const CONVERSATION_WRITING_EVENT_INTERVAL: u64 = 1;
+
+/// Lifetime of conversation writing event
+pub const CONVERSATION_WRITING_EVENT_LIFETIME: u64 = 3;
\ No newline at end of file