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package main
import (
"flag"
"fmt"
"time"
"github.com/bettercap/nrf24"
)
var (
pingPeriod = 100 * time.Millisecond
address = ""
rawAddress = []byte(nil)
pingPayload = []byte{0x0f, 0x0f, 0x0f, 0x0f}
err = error(nil)
)
func init() {
flag.StringVar(&address, "address", "", "Address to sniff for.")
flag.Parse()
}
func main() {
fmt.Printf("nRF24LU1+ - RFStorm Sniffer\n\n")
if err, rawAddress = nrf24.ConvertAddress(address); err != nil {
fmt.Printf("%v\n", err)
return
}
dongle, err := nrf24.Open()
if err != nil {
fmt.Printf("error: %v\n", err)
return
}
defer dongle.Close()
fmt.Printf("device open: %s\n", dongle.String())
if err = dongle.EnableLNA(); err != nil {
fmt.Printf("error enabling LNA: %v\n", err)
} else {
fmt.Printf("LNA enabled\n")
}
if err = dongle.EnterSnifferModeFor(rawAddress); err != nil {
fmt.Printf("error: %v\n", err)
return
} else {
fmt.Printf("device is in sniffer mode\n\n")
}
lastPing := time.Time{}
ch, _ := dongle.GetChannel()
for {
if time.Since(lastPing) >= pingPeriod {
if err = dongle.TransmitPayload(pingPayload, 250, 1); err != nil {
for ch = 1; ch <= nrf24.TopChannel; ch++ {
if err := dongle.SetChannel(ch); err != nil {
fmt.Printf("error setting channel %d: %v\n", ch, err)
} else if err = dongle.TransmitPayload(pingPayload, 250, 1); err == nil {
lastPing = time.Now()
break
}
}
}
}
if buf, err := dongle.ReceivePayload(); err != nil {
fmt.Printf("error receiving payload: %v\n", err)
} else if buf[0] == 0 {
buf = buf[1:]
fmt.Printf("[%s] (channel %02d) : (%02d bytes) %x\n", address, ch, len(buf), buf)
}
}
}
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