From f2f2edfcdfae8d4bb658dbb51817ccff1d8d3656 Mon Sep 17 00:00:00 2001
From: andig <cpuidle@gmx.de>
Date: Sun, 30 Oct 2022 16:23:40 +0100
Subject: [PATCH] Modbus: treat nan and inf responses as zero (#4968)

---
 util/modbus/modbus.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/util/modbus/modbus.go b/util/modbus/modbus.go
index c9e19b1c9..a715f756d 100644
--- a/util/modbus/modbus.go
+++ b/util/modbus/modbus.go
@@ -3,6 +3,7 @@ package modbus
 import (
 	"errors"
 	"fmt"
+	"math"
 	"strconv"
 	"strings"
 	"sync"
@@ -280,7 +281,11 @@ type Register struct {
 // asFloat64 creates a function that returns numerics vales as float64
 func asFloat64[T constraints.Signed | constraints.Unsigned | constraints.Float](f func([]byte) T) func([]byte) float64 {
 	return func(v []byte) float64 {
-		return float64(f(v))
+		res := float64(f(v))
+		if math.IsNaN(res) || math.IsInf(res, 0) {
+			res = 0
+		}
+		return res
 	}
 }