diff --git a/alert.go b/alert.go
index 104f812..9b5f8c6 100644
--- a/alert.go
+++ b/alert.go
@@ -11,7 +11,7 @@ import (
 )
 
 func sendSMS(phonenumber string, alertMessage string) {
-	myurl := fmt.Sprintf("https://api.smsapi.com/sms.do?to=%s&message=%s&format=json", phonenumber, url.QueryEscape(alertMessage))
+	myurl := fmt.Sprintf("https://api.smsapiblabla.com/sms.do?to=%s&message=%s&format=json", phonenumber, url.QueryEscape(alertMessage))
 
 	req, err := http.NewRequest("GET", myurl, nil)
 	if err != nil {
diff --git a/main.go b/main.go
index fb9501f..914b0d6 100644
--- a/main.go
+++ b/main.go
@@ -11,6 +11,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -558,6 +559,31 @@ func WriteDatapoint(mytime int64, deveui string, devaddr string, v uint8, h uint
 				location, _ := time.LoadLocation("Europe/Zurich")
 				alertMap[deveui] = fmt.Sprintf("*** Schwarmalarm ***\n%s\n%s\nGewichtsverlust: %d g", getDevAlias(deveui), time.Unix(mytime*60, 0).In(location).Format("02.01.2006 15:04"), w_loss)
 			}
+
+			// minmax Alert
+			minmax := getDevMinmax(deveui)
+			if minmax != "0,0" {
+				tokens := strings.Split(minmax, ",")
+				if len(tokens) == 2 {
+					min, _ := strconv.ParseInt(tokens[0], 10, 32)
+					max, _ := strconv.ParseInt(tokens[1], 10, 32)
+					minmaxstatus := GetMinMaxStatus(deveui)
+					if (w_gram < uint32(min)) && (minmaxstatus != "MINALERT") {
+						SetMinMaxStatus(deveui, "MINALERT")
+						alertLogMap[deveui] = fmt.Sprintf("alert,deveui=%s reason=\"minmaxlarm\",w=%di,w_min=%di %d\n", deveui, w_gram, min, mytime*60*1000*1000*1000)
+						location, _ := time.LoadLocation("Europe/Zurich")
+						alertMap[deveui] = fmt.Sprintf("*** Min/Max-Alarm ***\n%s\n%s\nUnterschreiten des Minimalgewichts: %d g (Minimal: %d g)", getDevAlias(deveui), time.Unix(mytime*60, 0).In(location).Format("02.01.2006 15:04"), w_gram, min)
+					} else if (w_gram > uint32(max)) && (minmaxstatus != "MAXALERT") {
+						SetMinMaxStatus(deveui, "MAXALERT")
+						alertLogMap[deveui] = fmt.Sprintf("alert,deveui=%s reason=\"minmaxlarm\",w=%di,w_max=%di %d\n", deveui, w_gram, max, mytime*60*1000*1000*1000)
+						location, _ := time.LoadLocation("Europe/Zurich")
+						alertMap[deveui] = fmt.Sprintf("*** Min/Max-Alarm ***\n%s\n%s\nUeberschreiten des Maximalgewichts: %d g (Maximal: %d g)", getDevAlias(deveui), time.Unix(mytime*60, 0).In(location).Format("02.01.2006 15:04"), w_gram, max)
+					} else if (w_gram > uint32(min+100)) && (w_gram < uint32(max-100)) {
+						SetMinMaxStatus(deveui, "NORMAL")
+					}
+				}
+			}
+
 		}
 	}
 }
diff --git a/persistence.go b/persistence.go
index 0e1abfd..a36ec08 100644
--- a/persistence.go
+++ b/persistence.go
@@ -195,6 +195,26 @@ func getSmsnumber(deveui string) string {
 	return res
 }
 
+func getDevMinmax(deveui string) string {
+	res := "0,0"
+
+	if deveui == "" {
+		return res
+	}
+
+	conn := globalPool.Get()
+	defer conn.Close()
+
+	minmax, err := redis.String(conn.Do("HGET", devPrefix+deveui, "minmax"))
+	if err == nil {
+		res = minmax
+	} else {
+		fmt.Println(err)
+	}
+
+	return res
+}
+
 func GetDownlinkCommand(deveui string) string {
 	// 0: do nothing...
 	res := "do_nothing"
@@ -217,6 +237,37 @@ func GetDownlinkCommand(deveui string) string {
 	return res
 }
 
+func SetMinMaxStatus(deveui string, status string) error {
+	conn := globalPool.Get()
+	defer conn.Close()
+
+	// SET object
+	_, err := conn.Do("HMSET", devPrefix+deveui, "minmaxstatus", status)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func GetMinMaxStatus(deveui string) string {
+	res := "NORMAL"
+
+	if deveui == "" {
+		return res
+	}
+
+	conn := globalPool.Get()
+	defer conn.Close()
+
+	minmax, err := redis.String(conn.Do("HGET", devPrefix+deveui, "minmaxstatus"))
+	if err == nil {
+		res = minmax
+	}
+
+	return res
+}
+
 func SetDownlinkCommand(deveui string, new_command string) error {
 	conn := globalPool.Get()
 	defer conn.Close()