Add optional debug logging for frame decoding.

cmd/invertergui/config.go

@@ -22,6 +22,7 @@ type config struct {
 		Username string `long:"mqtt.username" env:"MQTT_USERNAME" default:"" description:"Set the MQTT username"`
 		Password string `long:"mqtt.password" env:"MQTT_PASSWORD" default:"" description:"Set the MQTT password"`
 	}
+	Loglevel string `long:"loglevel" env:"LOGLEVEL" default:"info" description:"The log level to generate logs at. (\"panic\", \"fatal\", \"error\", \"warn\", \"info\", \"debug\", \"trace\")"`
 }
 
 func parseConfig() (*config, error) {

cmd/invertergui/main.go

@@ -58,6 +58,11 @@ func main() {
 		os.Exit(1)
 	}
 	log.Info("Starting invertergui")
+	logLevel, err := logrus.ParseLevel(conf.Loglevel)
+	if err != nil {
+		log.Fatalf("Could not parse log level: %v", err)
+	}
+	logrus.SetLevel(logLevel)
 
 	mk2, err := getMk2Device(conf.Data.Source, conf.Data.Host, conf.Data.Device)
 	if err != nil {