greenzone alert

alert.go

@@ -100,17 +100,19 @@ func DispatchAlert(deveui string, alertType string) {
 	}
 
 	// then we check that an alert was not already sent out recently
-	if AlertAlreadySentRecently(deveui) {
+	if AlertAlreadySentRecently(deveui, alertType) {
 		fmt.Printf("Error: Alert for Deveui %s has already been sent!", deveui)
 		return
 	}
 
 	// then we make an entry that an alert was sent, this will expire automatically
-	AddAlertAlreadySentRecently(deveui)
+	AddAlertAlreadySentRecently(deveui, alertType)
 
 	// then we send the alert
 	if alertType == "alert_button" {
 		alertMessage = fmt.Sprintf("Alarm (%s): Knopf gedrueckt, %s", getDevAlias(deveui), time.Now().Format("02.01.2006 15:04:05"))
+	} else if alertType == "alert_greenzone" {
+		alertMessage = fmt.Sprintf("Alarm (%s): Gruene Zone wurde verlassen, %s", getDevAlias(deveui), time.Now().Format("02.01.2006 15:04:05"))
 	}
 	sendAlert(deveui, alertMessage)
 }

persistence.go

@@ -192,29 +192,66 @@ func getEmail(deveui string) string {
 	return res
 }
 
-func AlertAlreadySentRecently(deveui string) bool {
+func getDevGreenzone(deveui string) string {
+	res := ""
+
+	if deveui == "" {
+		return res
+	}
+
 	conn := globalPool.Get()
 	defer conn.Close()
 
-	exists, _ := redis.Bool(conn.Do("EXISTS", alertsentPrefix+deveui))
+	greenzone, err := redis.String(conn.Do("HGET", devPrefix+deveui, "greenzone"))
+	if err == nil {
+		res = greenzone
+	} else {
+		log.Print(err)
+	}
+
+	return res
+}
+
+func AlertAlreadySentRecently(deveui string, what string) bool {
+	conn := globalPool.Get()
+	defer conn.Close()
+
+	exists, _ := redis.Bool(conn.Do("EXISTS", alertsentPrefix+deveui+":"+what))
 	return exists
 }
 
-func AddAlertAlreadySentRecently(deveui string) {
+func AddAlertAlreadySentRecently(deveui string, what string) {
 	conn := globalPool.Get()
 	defer conn.Close()
+	expire_duration := 120
+	if what == "alert_greenzone" {
+		expire_duration = 7 * 24 * 60 * 60
+	}
 
-	_, err := conn.Do("SET", alertsentPrefix+deveui, "1")
+	_, err := conn.Do("SET", alertsentPrefix+deveui+":"+what, "1")
 
 	if err != nil {
 		return
 	}
 
 	// we set an expiration time to prevent duplicate alerts
-	_, err1 := conn.Do("EXPIRE", alertsentPrefix+deveui, 120)
+	_, err1 := conn.Do("EXPIRE", alertsentPrefix+deveui+":"+what, expire_duration)
 
 	if err1 != nil {
 		return
 	}
 
 }
+
+func DeleteGreenzoneAlert(deveui string) bool {
+	conn := globalPool.Get()
+	defer conn.Close()
+
+	_, err := conn.Do("DEL", alertsentPrefix+deveui+":alert_greenzone")
+	if err != nil {
+		return false
+	}
+
+	return true
+
+}

wo-bisch-lorahandler.go

@@ -11,6 +11,8 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"strconv"
+	"strings"
 	"time"
 )
 
@@ -65,6 +67,30 @@ func Convert2Hex(payload_raw string) (string, error) {
 	return res, err
 }
 
+func IsOutsideGreenzone(deveui string, lon float64, lat float64) bool {
+	res := false
+	if lon < 1 {
+		return res
+	}
+	if lat < 1 {
+		return res
+	}
+	greenzone := getDevGreenzone(deveui)
+	if greenzone != "" {
+		coords := strings.Split(greenzone, ",")
+		if len(coords) == 4 {
+			lon_min, _ := strconv.ParseFloat(coords[0], 32)
+			lat_min, _ := strconv.ParseFloat(coords[1], 32)
+			lon_max, _ := strconv.ParseFloat(coords[2], 32)
+			lat_max, _ := strconv.ParseFloat(coords[3], 32)
+			res = (lon < lon_min || lon > lon_max || lat < lat_min || lat > lat_max)
+		} else {
+			log.Printf("greenzone does not have right format: %s!", greenzone)
+		}
+	}
+	return res
+}
+
 func DecodePayload(s string, deveui string) {
 	type payload struct {
 		Latitude  uint32
@@ -93,10 +119,19 @@ func DecodePayload(s string, deveui string) {
 		vbat := (pl.AlarmBat & 0x3fff)            // Battery Voltage in mV
 		fw := 160 + (pl.Flag & 0x1f)              // Firmware version; 5 bits
 		alarm := (pl.AlarmBat & 0x4000) == 0x4000 // Alarm Bit
+		outsideGreenzone := IsOutsideGreenzone(deveui, float64(pl.Longitude)/1000000.0, float64(pl.Latitude)/1000000.0)
+		flags := 0
+		if outsideGreenzone {
+			flags += 2
+		}
+		if alarm {
+			flags += 1
+		}
 
 		log.Printf("AlarmBit:         %v", alarm)
+		log.Printf("outsideGreenzone: %v", outsideGreenzone)
 
-		mystring := fmt.Sprintf("measurement,deveui=%s lat=%.5f,lon=%.5f,vbat=%d,fw=%d %d\n", deveui, float32(pl.Latitude)/1000000.0, float32(pl.Longitude)/1000000.0, vbat, fw, (time.Now().Unix() * 1000 * 1000 * 1000))
+		mystring := fmt.Sprintf("measurement,deveui=%s lat=%.5f,lon=%.5f,vbat=%d,fw=%d,flags=%d %d\n", deveui, float32(pl.Latitude)/1000000.0, float32(pl.Longitude)/1000000.0, vbat, fw, flags, (time.Now().Unix() * 1000 * 1000 * 1000))
 
 		WriteStringToFile(mystring, deveui)
 		// we send an alert, when the alert bit is set
@@ -104,6 +139,16 @@ func DecodePayload(s string, deveui string) {
 			log.Printf("DispatchAlert (button pressed) for %s\n", deveui)
 			DispatchAlert(deveui, "alert_button")
 		}
+		if outsideGreenzone {
+			log.Printf("DispatchAlert (outside greenzone) for %s\n", deveui)
+			DispatchAlert(deveui, "alert_greenzone")
+		} else {
+			// we reset the alert, when we are again withing the greenzone
+			if AlertAlreadySentRecently(deveui, "alert_greenzone") {
+				fmt.Printf("Info: we are again in Greenzone for Deveui %s, clear alert!", deveui)
+				DeleteGreenzoneAlert(deveui)
+			}
+		}
 
 	} else {
 		log.Printf("Payload is not >= 11 bytes (22 chars): %s", s)