From 95925b563a6f3ad6f173e0c2d0cd58a9056df76d Mon Sep 17 00:00:00 2001
From: Allen Hill <allenofthehills@gmail.com>
Date: Thu, 18 Jun 2026 15:56:30 -0700
Subject: [PATCH] Stop playing if nobody's listening

---
 src/avclandrv.h | 1 +
 src/sniffer.c   | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/src/avclandrv.h b/src/avclandrv.h
index 81ca7b8..f7b5869 100644
--- a/src/avclandrv.h
+++ b/src/avclandrv.h
@@ -218,6 +218,7 @@ AVCLAN_frame_t *AVCLAN_getStatusFrame();
 void AVCLAN_generateStatus(AVCLAN_frame_t *status, bool is_unicast, devices to);
 
 bool AVCLAN_isPlaying();
+void AVCLAN_stopPlaying();
 void AVCLAN_incrementTime();
 void AVCLAN_setTime(uint8_t mins, uint8_t secs);
 void AVCLAN_normalizeState();
diff --git a/src/sniffer.c b/src/sniffer.c
index fae3080..a3824ff 100644
--- a/src/sniffer.c
+++ b/src/sniffer.c
@@ -110,6 +110,7 @@ int main() {
   uint8_t seqIdx = 0; // current index in data_tmp
 
   uint8_t err = 0;
+  uint8_t failedStatusReports = 0;
 
   for (uint8_t i = 0; i < CACHE_SIZE; ++i) {
     frames[i].control = 0x0f;
@@ -169,6 +170,12 @@ int main() {
       err = AVCLAN_sendframe(
           out, (log_t){.print = printAllFrames, .binary = printBinary});
       if (err || resp->r == r_Handled) {
+        if (err && out == AVCLAN_getStatusFrame() &&
+            failedStatusReports++ > 1) {
+          failedStatusReports = 0;
+          AVCLAN_stopPlaying(); // Disable periodic updates if e.g. no-one's
+                                // listening (car was turned off?)
+        }
         return_resp(resp);
       } else {
         resp = AVCLAN_statemachine(resp);