From c0ed62dc7a6da45d18cc72e99d7c53eb7a914f4f Mon Sep 17 00:00:00 2001
From: MichaelDvP <github@mdvp.de>
Date: Thu, 19 Dec 2024 12:24:46 +0100
Subject: [PATCH] modbus: don't show not found errors in first minute

---
 src/modbus.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/modbus.cpp b/src/modbus.cpp
index 0c0432a15..5ed595590 100644
--- a/src/modbus.cpp
+++ b/src/modbus.cpp
@@ -310,8 +310,11 @@ ModbusMessage Modbus::handleRead(const ModbusMessage & request) {
         }
     }
     if (error_code) {
-        LOG_ERROR("Unable to read raw device value %s for tag=%d - error_code = %d", modbusInfo->short_name, (int)tag, error_code);
+        if (uuid::get_uptime_sec() > 60 || error_code < -2) { // suppress not found messages for the first minute
+            LOG_ERROR("Unable to read raw device value %s for tag=%d - error_code = %d", modbusInfo->short_name, (int)tag, error_code);
+        }
         response.setError(request.getServerID(), request.getFunctionCode(), SERVER_DEVICE_FAILURE);
+        return response;
     }
 
     response.add(request.getServerID());