From dec890104bb34b68363659744042e8e3896f6a59 Mon Sep 17 00:00:00 2001
From: Smittix <jamessmith1@outlook.com>
Date: Thu, 15 Jan 2026 08:03:47 +0000
Subject: [PATCH] Fix acarsdec JSON output flag for newer forks

Use -j instead of -o 4 for JSON output, which is the correct
flag for acarsdec v4.3.1+ (Thibaut Varene fork).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 routes/acars.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/routes/acars.py b/routes/acars.py
index 49af864..4bbb4b1 100644
--- a/routes/acars.py
+++ b/routes/acars.py
@@ -176,11 +176,12 @@ def start_acars() -> Response:
     acars_last_message_time = None
 
     # Build acarsdec command
-    # acarsdec -o 4 -g <gain> -p <ppm> -r <device> <freq1> <freq2> ...
-    # Note: -o 4 is JSON stdout, gain/ppm must come BEFORE -r
+    # acarsdec -j -g <gain> -p <ppm> -r <device> <freq1> <freq2> ...
+    # Note: -j is JSON stdout (newer forks), -o 4 was the old syntax
+    # gain/ppm must come BEFORE -r
     cmd = [
         acarsdec_path,
-        '-o', '4',               # JSON output to stdout
+        '-j',                    # JSON output to stdout
     ]
 
     # Add gain if not auto (must be before -r)