package main import ( "bufio" "fmt" "io" "os" "github.com/Luzifer/rconfig/v2" "github.com/jacobsa/go-serial/serial" log "github.com/sirupsen/logrus" ) var ( cfg = struct { CULDevice string `flag:"cul-device" default:"/dev/ttyACM0" description:"TTY of the CUL to connect to"` LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"` MQTTHost string `flag:"mqtt-host" default:"tcp://127.0.0.1:1883" description:"Connection URI for the broker"` MQTTUser string `flag:"mqtt-user" default:"" description:"Username for broker connection"` MQTTPass string `flag:"mqtt-pass" default:"" description:"Password for broker connection"` VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"` }{} port io.ReadWriteCloser version = "dev" ) func init() { rconfig.AutoEnv(true) if err := rconfig.ParseAndValidate(&cfg); err != nil { log.Fatalf("Unable to parse commandline options: %s", err) } if cfg.VersionAndExit { fmt.Printf("culmqtt %s\n", version) os.Exit(0) } if l, err := log.ParseLevel(cfg.LogLevel); err != nil { log.WithError(err).Fatal("Unable to parse log level") } else { log.SetLevel(l) } } func main() { options := serial.OpenOptions{ PortName: cfg.CULDevice, BaudRate: 19200, DataBits: 8, StopBits: 1, MinimumReadSize: 4, } // Open the port. var err error if port, err = serial.Open(options); err != nil { log.Fatalf("serial.Open: %v", err) } // Make sure to close it later. defer port.Close() // Send initialization for the CUL // TODO: This might be useful to be configurable? fmt.Fprintln(port, "Ax") // reset AskSin fmt.Fprintln(port, "Zx") // reset Moritz fmt.Fprintln(port, "brx") // reset WMBus fmt.Fprintln(port, "X21") // Turn on echoing of received messages for { scanner := bufio.NewScanner(port) for scanner.Scan() { if err := processMessage(scanner.Text()); err != nil { log.WithError(err).Fatal("Unable to process message") } } } } func processMessage(message string) error { logger := log.WithField("message", message) if message == "" { return nil } switch message[0] { case 'F': return processFS20Message( message[1:5], // House code: 4 hex digits message[5:7], // Device code: 2 hex digits message[7:9], // Command: 2 hex digits ) case 'V': // Version information, discard return nil default: logger.Error("Unknown message specifier") return nil } }