Add termination handler

cmd/smartbridge/main.go

@@ -3,6 +3,8 @@ package main
 import (
 	"fmt"
 	"os"
+	"os/signal"
+	"syscall"
 	"time"
 )
 
@@ -10,7 +12,7 @@ var mqtt_c Mqtt
 
 func establishMqtt() error {
 	var err error
-	n := 5
+	n := 5 // Reconnection attempts
 
 	for i := 0; i < n; i++ {
 		mqtt_c, err = ConnectMqtt(cf.Mqtt, 1883)
@@ -23,8 +25,18 @@ func establishMqtt() error {
 	return fmt.Errorf("connection failed")
 }
 
-func main() {
+// awaits SIGINT or SIGTERM and quit program
+func awaitTerminationSignal() {
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+	go func() {
+		sig := <-sigs
+		fmt.Println(sig)
+		os.Exit(1)
+	}()
+}
 
+func main() {
 	cf.SetDefaults()
 
 	if err := establishMqtt(); err != nil {
@@ -32,7 +44,8 @@ func main() {
 		os.Exit(1)
 	}
 
-	fmt.Println("smartbridge reader operational")
+	awaitTerminationSignal()
+	fmt.Println("smartbridge SBWF3102 reader")
 	for true {
 		reading, err := ReadSmartbridge(cf.Remote)
 		if err != nil {