From c7b0f9783de382dc40b65e61915f7233ebeba744 Mon Sep 17 00:00:00 2001
From: Timo <16718859+toger5@users.noreply.github.com>
Date: Wed, 30 Jul 2025 14:58:45 +0200
Subject: [PATCH] expose `delayed_leave_event_restart_local_timeout_ms` to
 `config.json` (#3415)

---
 src/config/ConfigOptions.ts | 11 +++++++++++
 src/rtcSessionHelpers.ts    |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/src/config/ConfigOptions.ts b/src/config/ConfigOptions.ts
index c4dc9144..75bd7cbb 100644
--- a/src/config/ConfigOptions.ts
+++ b/src/config/ConfigOptions.ts
@@ -125,6 +125,17 @@ export interface ConfigOptions {
     /** @deprecated use delayed_leave_event_delay_ms instead */
     membership_server_side_expiry_timeout?: number;
 
+    /**
+     * The time (in milliseconds) after which a we consider a delayed event restart http request to have failed.
+     * Setting this to a lower value will result in more frequent retries but also a higher chance of failiour.
+     *
+     * In the presence of network packet loss (hurting TCP connections), the custom delayedEventRestartLocalTimeoutMs
+     * helps by keeping more delayed event reset candidates in flight,
+     * improving the chances of a successful reset. (its is equivalent to the js-sdk `localTimeout` configuration,
+     * but only applies to calls to the `_unstable_updateDelayedEvent` endpoint with a body of `{action:"restart"}`.)
+     */
+    delayed_leave_event_restart_local_timeout_ms?: number;
+
     /**
      * The time interval (in milliseconds) at which the client sends membership keep-alive
      * messages to the server by restarting the timer for the delayed leave event.
diff --git a/src/rtcSessionHelpers.ts b/src/rtcSessionHelpers.ts
index 3ff6b560..a193b8e5 100644
--- a/src/rtcSessionHelpers.ts
+++ b/src/rtcSessionHelpers.ts
@@ -128,6 +128,8 @@ export async function enterRTCSession(
       delayedLeaveEventDelayMs:
         matrixRtcSessionConfig?.delayed_leave_event_delay_ms ??
         matrixRtcSessionConfig?.membership_server_side_expiry_timeout,
+      delayedLeaveEventRestartLocalTimeoutMs:
+        matrixRtcSessionConfig?.delayed_leave_event_restart_local_timeout_ms,
       networkErrorRetryMs: matrixRtcSessionConfig?.network_error_retry_ms,
       makeKeyDelay:
         matrixRtcSessionConfig?.wait_for_key_rotation_ms ??