From a48cecee59bfa7e987a7a1aa7741c7b125bf14fb Mon Sep 17 00:00:00 2001
From: AJ Schmidt <ajs4392@gmail.com>
Date: Mon, 21 Dec 2020 19:44:48 -0500
Subject: [PATCH] update serial read_line

---
 alarmdecoder/devices/serial_device.py |  2 +-
 alarmdecoder/util.py                  | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/alarmdecoder/devices/serial_device.py b/alarmdecoder/devices/serial_device.py
index c93b86b..7be6ddb 100644
--- a/alarmdecoder/devices/serial_device.py
+++ b/alarmdecoder/devices/serial_device.py
@@ -229,7 +229,7 @@ class SerialDevice(Device):
                 buf = filter_ad2prot_byte(self._device.read(1))
 
                 if buf != b'':
-                    self._buffer +=  buf[0]
+                    self._buffer += buf
 
                     if buf == b"\n":
                         self._buffer = self._buffer.rstrip(b"\r\n")
diff --git a/alarmdecoder/util.py b/alarmdecoder/util.py
index 566f2ae..902b21d 100644
--- a/alarmdecoder/util.py
+++ b/alarmdecoder/util.py
@@ -97,14 +97,14 @@ def filter_ad2prot_byte(buf):
     """
     Return the byte sent in back if valid visible terminal characters or line terminators.
     """
-    c = buf[0];
+    c = buf[0]
 
-    if (c == '\n' or c == '\r'):
-        return c
+    if (c == 10 or c == 13):
+        return buf
     if (c > 31 and c < 127):
-        return c
+        return buf
     else:
-        return ''
+        return b''
 
 def read_firmware_file(file_path):
     """