From 3cccdd9c4f73ebdedd18bf28f0669147d78a87a3 Mon Sep 17 00:00:00 2001
From: barkow <barkow@users.noreply.github.com>
Date: Thu, 27 Oct 2022 21:46:07 +0200
Subject: [PATCH] Change modbus rx message length check

Start evaluating messages already after message length information byte is received. Necessary to support read coil status messages.
---
 tasmota/tasmota_xsns_sensor/xsns_53_sml.ino | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino b/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
index 62e06f3ac..451044a8e 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
@@ -1683,7 +1683,7 @@ void sml_shift_in(uint32_t meters,uint32_t shard) {
         meter_spos[meters] = 0;
       }
       // modbus
-      if (meter_spos[meters] >= 8) {
+      if (meter_spos[meters] >= 3) {
         uint32_t mlen = smltbuf[meters][2] + 5;
         if (mlen > SML_BSIZ) mlen = SML_BSIZ;
         if (meter_spos[meters] >= mlen) {