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radio_rx.go
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radio_rx.go
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package main
import (
"errors"
"fmt"
"log"
"os"
"os/signal"
"syscall"
"time"
"github.com/alecthomas/kong"
"github.com/go-logr/logr"
"github.com/go-logr/stdr"
"github.com/jacobsa/go-serial/serial"
"github.com/omaskery/rn2483"
)
var CLI struct {
Port string `kong:"arg,help='serial device port to open'"`
Verbosity int `kong:"short='v',type='counter',help='increases the logging verbosity',env='VERBOSITY'"`
BaudRate uint `kong:"default='57600',help='baud rate for serial port',env='BAUDRATE'"`
AssumeText bool `kong:"help='assumes packets are printable text, and prints them as such',env='ASSUME_TEXT'"`
}
func main() {
kong.Parse(
&CLI,
kong.Description("simple test program to listen for incoming packets"),
kong.UsageOnError(),
)
logger := stdr.New(log.Default())
stdr.SetVerbosity(CLI.Verbosity)
if err := errMain(logger); err != nil {
logger.Error(err, "program exiting with error")
os.Exit(1)
}
}
func errMain(logger logr.Logger) error {
s, err := serial.Open(serial.OpenOptions{
PortName: CLI.Port,
BaudRate: CLI.BaudRate,
DataBits: 8,
StopBits: 1,
MinimumReadSize: 1,
})
if err != nil {
return fmt.Errorf("error opening serial port: %v", err)
}
dbg := &rn2483.DebugSerial{
Serial: s,
Logger: logger.WithName("serial").V(1),
AssumeText: true,
}
device := rn2483.New(rn2483.Config{
Serial: dbg,
})
defer func() {
if err := device.Close(); err != nil {
logger.Error(err, "error closing device")
}
}()
pauseDuration, err := device.PauseMAC()
if err != nil {
return fmt.Errorf("error pausing MAC layer: %w", err)
}
logger.Info("MAC layer paused", "duration", pauseDuration, "until", time.Now().Add(pauseDuration))
stop := make(chan os.Signal)
signal.Notify(stop, syscall.SIGTERM, syscall.SIGKILL)
go func() {
for {
rx, err := device.RadioRx(rn2483.ContinuousReceiveMode)
if errors.Is(err, rn2483.ErrReceiveTimeout) {
continue
}
if err != nil {
logger.Error(err, "error receiving packet")
break
}
data := string(rx)
if !CLI.AssumeText {
data = rn2483.BytesToHex(rx)
}
logger.Info("received", "data", data)
}
}()
<-stop
return nil
}