From d081d42b53e22c8465d7cb5aa0b5f932b6c0521a Mon Sep 17 00:00:00 2001
From: Francois Wautier <francois@wautier.eu>
Date: Fri, 29 Jan 2021 18:18:13 +0700
Subject: [PATCH] self._header needs to be set to {}. If not, the first frame
 would always be missed.

populateHeader() is called in isFrameReady() and checkFrame(). In isFrameReady,
populateHeader is only called 'if not self._header', and checkFrame is only called
'if isFrameReady()'.

Reset also sets self._header to {}.
---
 pymodbus/framer/rtu_framer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pymodbus/framer/rtu_framer.py b/pymodbus/framer/rtu_framer.py
index c5fe5a616..d862c157e 100644
--- a/pymodbus/framer/rtu_framer.py
+++ b/pymodbus/framer/rtu_framer.py
@@ -60,7 +60,7 @@ def __init__(self, decoder, client=None):
         :param decoder: The decoder factory implementation to use
         """
         self._buffer = b''
-        self._header = {'uid': 0x00, 'len': 0, 'crc': '0000'}
+        self._header = {}
         self._hsize = 0x01
         self._end = b'\x0d\x0a'
         self._min_frame_size = 4