From 69bceecd70dc2ad5b5bc6338973dfcfb059133b6 Mon Sep 17 00:00:00 2001
From: Bryan Biedenkapp <gatekeep@gmail.com>
Date: Mon, 12 Jan 2026 22:28:41 -0500
Subject: [PATCH] preamble tones are not supported for UDP audio;

---
 src/bridge/HostBridge.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/bridge/HostBridge.cpp b/src/bridge/HostBridge.cpp
index 31f295fa..8a5613c3 100644
--- a/src/bridge/HostBridge.cpp
+++ b/src/bridge/HostBridge.cpp
@@ -1536,6 +1536,9 @@ void HostBridge::sendUsrpEot()
 
 void HostBridge::generatePreambleTone()
 {
+    if (!m_localAudio)
+        return;
+
     std::lock_guard<std::mutex> lock(s_audioMutex);
 
     uint64_t frameCount = AnalogAudio::toSamples(SAMPLE_RATE, 1, m_preambleLength);