elite-dangerous-control-panel-8.go

const baudRate = 9600

type serialPort struct {
    MaxBaudRate int
    DeviceID    string
}

func getSerialPort(pnp string) (*serial.Port, error) {
    var dst []serialPort

    // WMI needs the backslashes to be escaped.
    escaped := strings.Replace(pnp, "\\", "\\\\", -1)
    query := "SELECT DeviceID, MaxBaudRate FROM Win32_SerialPort WHERE PNPDeviceID='" + escaped + "'"
    client := &wmi.Client{AllowMissingFields: true}
    
    // Put the query results into a slice of serialPort objects.
    err := client.Query(query, &dst)
    if err != nil {
        return nil, fmt.Errorf("Couldn't connect to serial port: %s", err.Error())
    } else if len(dst) < 1 {
        return nil, fmt.Errorf("Couldn't find a PNP Device with ID '%s'", pnp)
    }

	// Open the serial connection.
    conf := &serial.Config{Name: dst[0].DeviceID, Baud: baudRate}
    s, err := serial.OpenPort(conf)
    if err != nil {
        return nil, fmt.Errorf("Couldn't open serial port: %s", err.Error())
    }

    elog.Info(1, fmt.Sprintf("Connected to serial port %s at baud rate %d", dst[0].DeviceID, baudRate))
    
    // Everything seems to have worked; return the serial port.
    return s, nil
}