From e1924e1919a44fc1b3439754e16420ba1c41c2f1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leon=20B=C3=B6ttger?= <leon.boettger@icloud.com>
Date: Sun, 8 Mar 2026 14:40:16 +0100
Subject: [PATCH] Improve ACK logic

---
 NearbyShare/Connection/NearbyConnection.swift | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/NearbyShare/Connection/NearbyConnection.swift b/NearbyShare/Connection/NearbyConnection.swift
index ac23fe8..97fff66 100644
--- a/NearbyShare/Connection/NearbyConnection.swift
+++ b/NearbyShare/Connection/NearbyConnection.swift
@@ -442,7 +442,15 @@ class NearbyConnection {
             }
         }
         else if offlineFrame.hasV1, offlineFrame.v1.hasType, case .keepAlive = offlineFrame.v1.type {
-            sendKeepAlive(ack: true)
+            if offlineFrame.v1.hasKeepAlive {
+                let keepAlive = offlineFrame.v1.keepAlive
+                if !keepAlive.hasAck || !keepAlive.ack {
+                    sendKeepAlive(ack: true)
+                }
+            } else {
+                // Older peers can omit the keepAlive payload; default to ACK reply.
+                sendKeepAlive(ack: true)
+            }
         } else {
             
             if offlineFrame.hasV1, offlineFrame.v1.hasType, offlineFrame.v1.type == .bandwidthUpgradeRetry {