func newSerialProxy(devicename string, options Options) (interface{}, error) {
opt := rs232.Options{BitRate: options.BitRate, DataBits: options.DataBits, StopBits: options.StopBits, Timeout: options.Timeout}
dev, err := rs232.Open(devicename, opt)
return dev, err
}
// Start processing text lines to and from the serial interface.
// Send a bool to adjust RTS or an int to pulse DTR for that many milliseconds.
// Registers as "SerialPort".
func (w *SerialPort) Run() {
if port, ok := <-w.Port; ok {
opt := rs232.Options{BitRate: 57600, DataBits: 8, StopBits: 1}
dev, err := rs232.Open(port.(string), opt)
// flow.Check(err)
if err != nil {
glog.Warningln("cannot connect to", port.(string))
return
}
// try to avoid kernel panics due to that wretched buggy FTDI driver!
// defer func() {
// time.Sleep(time.Second)
// dev.Close()
// }()
// time.Sleep(time.Second)
// separate process to copy data out to the serial port
go func() {
for m := range w.To {
switch v := m.(type) {
case string:
dev.Write([]byte(v + "\n"))
case []byte:
dev.Write(v)
case int:
dev.SetDTR(true) // pulse DTR to reset
time.Sleep(time.Duration(v) * time.Millisecond)
dev.SetDTR(false)
case bool:
dev.SetRTS(v)
}
}
}()
scanner := bufio.NewScanner(dev)
for scanner.Scan() {
w.From.Send(scanner.Text())
}
}
}
func connect(port string) *serflash.Conn {
var dev io.ReadWriter
if _, err := os.Stat(port); os.IsNotExist(err) {
// if nonexistent, it's an ip address + port and open as network port
dev, err = net.Dial("tcp", port)
Check(err)
// RTS and DTR will be ignored unless telnet is specified
} else {
// else assume the tty is an existing device, open as rs232 port
opt := rs232.Options{BitRate: 115200, DataBits: 8, StopBits: 1}
dev, err = rs232.Open(port, opt)
Check(err)
}
if *telnetFlag {
dev = serflash.UseTelnet(dev)
}
return serflash.New(dev, *debugFlag, *waitFlag)
}
// listenToSerial reads incoming serial text lines and publishes them to MQTT.
func listenToSerial(device, topic string) *rs232.Port {
options := rs232.Options{BitRate: 57600, DataBits: 8, StopBits: 1}
serial, err := rs232.Open(device, options)
if err != nil {
log.Print(err)
return nil
}
scanner := bufio.NewScanner(serial)
go func() {
for scanner.Scan() {
// TODO support binary data with Bytes() i.s.o. Text() as option?
// this is likely to break in some places, e.g. "jet sub ..."
// solution could be to use some special topic naming convention
// also would need to enable read timeout for framing the data
// sendToHub(topic, scanner.Bytes(), false)
sendToHub(topic, scanner.Text(), false)
}
log.Println("unexpected EOF:", device)
// TODO: serial.Close() ?
}()
return serial
}
// Start processing text lines to and from the serial interface.
// Send a bool to adjust RTS or an int to pulse DTR for that many milliseconds.
// Registers as "SerialPort".
func (w *SerialPort) Run() {
baud := uint32(57600)
databits := uint8(8)
stopbits := uint8(1)
initdata := make([]interface{}, 0) //initialization data sequence (if supplied)
for param := range w.Param {
p := param.(flow.Tag)
switch p.Tag {
case "baud":
baud = uint32(p.Msg.(float64))
case "databits":
databits = uint8(p.Msg.(float64))
case "stopbits":
stopbits = uint8(p.Msg.(float64))
case "init":
initdata = append(initdata, p.Msg) //initialization sequence
}
}
if port, ok := <-w.Port; ok {
opt := rs232.Options{BitRate: baud, DataBits: databits, StopBits: stopbits}
dev, err := rs232.Open(port.(string), opt)
flow.Check(err)
// try to avoid kernel panics due to that wretched buggy FTDI driver!
// defer func() {
// time.Sleep(time.Second)
// dev.Close()
// }()
// time.Sleep(time.Second)
//handle initialization data (this loop only happens once)
go func() {
for _, data := range initdata {
switch data.(type) {
case map[string]interface{}:
hash := data.(map[string]interface{})
for k, v := range hash {
switch k {
case "delay":
if d, ok := v.(float64); ok {
<-time.After(time.Millisecond * time.Duration(int(d)))
}
}
}
default:
_, _ = writeHandler(dev, data)
}
}
}()
// separate process to copy data out to the serial port
go func() {
for m := range w.To {
_, _ = writeHandler(dev, m)
}
}()
scanner := bufio.NewScanner(dev)
for scanner.Scan() {
msg := scanner.Text()
w.From.Send(msg)
}
}
}