From b52431ca51613b38a0205466e81fe9cf51cdf6d7 Mon Sep 17 00:00:00 2001
From: Flyer350 <57186034+Flyer350@users.noreply.github.com>
Date: Mon, 24 Jan 2022 10:38:17 +0100
Subject: [PATCH] Update bds20.py

#message with empty callsign can still be BDS2,0

Example messages:
a900189f20000000000000d0d739
a100000020000000000000a81785
---
 pyModeS/decoder/bds/bds20.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyModeS/decoder/bds/bds20.py b/pyModeS/decoder/bds/bds20.py
index 63e10cd..914544e 100644
--- a/pyModeS/decoder/bds/bds20.py
+++ b/pyModeS/decoder/bds/bds20.py
@@ -26,7 +26,7 @@ def is20(msg):
 
     cs = cs20(msg)
 
-    if "#" in cs:
+    if "#" in cs and common.bin2int(d[8:56])>0: #message with empty callsign can still be BDS2,0
         return False
 
     return True