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add xbee session command line tools

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This commit is contained in:
saji 2023-05-07 00:00:35 -05:00
parent 86c9d8d492
commit b1bebae325
4 changed files with 109 additions and 111 deletions
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66
cmd/server.go
View file

@ -3,14 +3,15 @@ package cmd
import (
"fmt"
"net"
"os"
"time"
"github.com/kschamplin/gotelem/can"
"github.com/kschamplin/gotelem/socketcan"
"github.com/kschamplin/gotelem/xbee"
"github.com/tinylib/msgp/msgp"
"github.com/urfave/cli/v2"
"go.bug.st/serial"
"golang.org/x/exp/slog"
)
const xbeeCategory = "XBee settings"
@ -35,9 +36,6 @@ func serve(useXbee bool) {
go vcanTest()
go canHandler(broker)
go broker.Start()
if useXbee {
go xbeeSvc()
}
ln, err := net.Listen("tcp", ":8082")
if err != nil {
fmt.Printf("Error listening: %v\n", err)
@ -55,48 +53,7 @@ func serve(useXbee bool) {
func handleCon(conn net.Conn, broker *Broker) {
// reader := msgp.NewReader(conn)
rxPkts := make(chan gotelem.Data)
done := make(chan bool)
go func() {
// setpu our msgp reader.
scann := msgp.NewReader(conn)
data := gotelem.Data{}
for {
err := data.DecodeMsg(scann)
if err != nil {
break
}
rxPkts <- data
}
done <- true // if we got here, it means the connction was closed.
}()
// subscribe to can packets
// TODO: make this unique since remote addr could be non-unique
canCh := broker.Subscribe(conn.RemoteAddr().String())
writer := msgp.NewWriter(conn)
mainloop:
for {
select {
case canFrame := <-canCh:
cf := gotelem.CanBody{
Id: canFrame.Id,
Payload: canFrame.Data,
Source: "me",
}
cf.EncodeMsg(writer)
case rxBody := <-rxPkts:
// do nothing for now.
fmt.Printf("got a body %v\n", rxBody)
case <-time.After(1 * time.Second): // time out.
writer.Flush()
case <-done:
break mainloop
}
}
// unsubscribe and close the conn.
broker.Unsubscribe(conn.RemoteAddr().String())
conn.Close()
}
@ -107,27 +64,12 @@ func xbeeSvc(b *Broker) {
BaudRate: 115200,
}
sess, err := xbee.NewSerialXBee("/dev/ttyACM0", mode)
logger := slog.New(slog.NewTextHandler(os.Stderr))
_, err := xbee.NewSerialXBee("/dev/ttyACM0", mode, logger)
if err != nil {
fmt.Printf("got error %v", err)
panic(err)
}
receivedData := make(chan gotelem.Data)
// make a simple reader that goes in the background.
go func() {
msgpReader := msgp.NewReader(sess)
var msgData gotelem.Data
msgData.DecodeMsg(msgpReader)
receivedData <- msgData
}()
for {
select {
case data := <-receivedData:
fmt.Printf("Got a data %v\n", data)
}
}
}
// this spins up a new can socket on vcan0 and broadcasts a packet every second. for testing.

79
cmd/xbee.go
View file

@ -4,7 +4,14 @@ package cmd
// we can do network discovery and netcat-like things.
import (
"fmt"
"io"
"os"
"github.com/kschamplin/gotelem/xbee"
"github.com/urfave/cli/v2"
"go.bug.st/serial"
"golang.org/x/exp/slog"
)
var xbeeCmd = &cli.Command{
@ -21,25 +28,85 @@ For serial devices (COM1 and /dev/ttyUSB0), you can specify the baud rate
using a ':'. If excluded the baud rate will default to 9600. Note that
if using the native USB of the XLR Pro, the baud rate setting has no effect.
TCP/UDP connections require a port.
TCP/UDP connections require a port and will fail if one is not provided.
`,
Flags: []cli.Flag{
&cli.StringFlag{
Name: "device",
Aliases: []string{"d"},
Usage: "The XBee to connect to",
Name: "device",
Aliases: []string{"d"},
Usage: "The XBee to connect to",
Required: true,
EnvVars: []string{"XBEE_DEVICE"},
},
},
Subcommands: []*cli.Command{
{
Name: "info",
Usage: "get information about an xbee device",
Name: "info",
Usage: "get information about an xbee device",
Action: xbeeInfo,
HideHelpCommand: true,
},
{
Name: "netcat",
Aliases: []string{"nc"},
ArgsUsage: "[addr]",
Usage: "send data from stdio over the xbee",
Description: `
netcat emulates the nc command. It reads data from stdin and transmits it to
[addr] on the XBee network. If [addr] is FFFF or not present, it will broadcast
the data to all listening devices. Data received from the network will be
writtend to stdout.
`,
Action: netcat,
HideHelpCommand: true,
},
},
}
func xbeeInfo(ctx *cli.Context) error {
logger := slog.New(slog.NewTextHandler(os.Stderr))
xb, err := xbee.NewSerialXBee("/dev/ttyACM0", &serial.Mode{}, logger)
if err != nil {
return cli.Exit(err, 1)
}
b, err := xb.ATCommand([2]rune{'I', 'D'}, nil, false)
if err != nil {
return cli.Exit(err, 1)
}
fmt.Println(b)
return nil
}
func netcat(ctx *cli.Context) error {
if ctx.Args().Len() < 1 {
cli.ShowSubcommandHelp(ctx)
return cli.Exit("missing [addr] argument", 1)
}
// basically create two pipes.
logger := slog.New(slog.NewTextHandler(os.Stderr))
xb, _ := xbee.NewSerialXBee("/dev/ttyACM0", &serial.Mode{}, logger)
sent := make(chan int64)
streamCopy := func(r io.ReadCloser, w io.WriteCloser) {
defer r.Close()
defer w.Close()
n, err := io.Copy(w, r)
if err != nil {
logger.Warn("got error copying", "err", err)
}
sent <- n
}
go streamCopy(os.Stdin, xb)
go streamCopy(xb, os.Stdout)
<-sent
return nil
}

26
xbee/conntrack.go
View file

@ -16,6 +16,12 @@ type connTrack struct {
// the map is set when writing a frame, and deleted when recieving a matching frame.
}
func NewConnTrack() *connTrack {
return &connTrack{
internal: make(map[uint8]chan []byte),
}
}
// GetMark finds the next available marker and takes it, returning the value of
// the mark as well as a channel to use as a semaphore when the mark is cleared.
// If no mark can be acquired, it returns an error.
@ -49,16 +55,18 @@ func (ct *connTrack) GetMark() (uint8, <-chan []byte, error) {
// tracked.
func (ct *connTrack) ClearMark(mark uint8, data []byte) error {
ct.mu.RLock()
// FIXME: should this be the other way around (swap if and normal execution
if val, ok := ct.internal[mark]; ok {
val, ok := ct.internal[mark]
if !ok {
ct.mu.RUnlock()
ct.mu.Lock()
val <- data
close(val)
delete(ct.internal, mark)
ct.mu.Unlock()
return nil
return errors.New("mark was not set")
}
ct.mu.RUnlock()
return errors.New("mark was not set")
ct.mu.Lock()
val <- data
close(val)
delete(ct.internal, mark)
ct.mu.Unlock()
return nil
}

49
xbee/session.go
View file

@ -38,7 +38,7 @@ type SerialSession struct {
writeLock sync.Mutex // prevents multiple writers from accessing the port at once.
}
func NewSerialXBee(portName string, mode *serial.Mode) (*SerialSession, error) {
func NewSerialXBee(portName string, mode *serial.Mode, baseLog *slog.Logger) (*SerialSession, error) {
// make the session with the port/mode given, and set up the conntrack.
sess := &SerialSession{}
@ -48,7 +48,8 @@ func NewSerialXBee(portName string, mode *serial.Mode) (*SerialSession, error) {
}
sess.port = port
sess.ct = connTrack{}
sess.ct = *NewConnTrack()
sess.Logger = *baseLog.With("portname", portName)
// setup io readwriter with a pipe.
rd, wr := io.Pipe()
@ -76,19 +77,16 @@ func (sess *SerialSession) rxHandler() {
scan.Split(xbeeFrameSplit)
for scan.Scan() {
// TODO: check for errors?
// data is a frame payload - not a full frame.
data, err := parseFrame(scan.Bytes())
if err != nil {
sess.Logger.Warn("error parsing frame", "error", err, "data", data)
continue
}
// data is good, lets parse the frame - using the first byte as the identifier.
switch XBeeCmd(data[0]) {
case RxPktType:
// we parse the data, and push it to the rx buffer.
//TODO: if we have multiple sources, we need to track them here.
//TODO: if we have multiple remotes on the network, we need to track them here.
frame, err := ParseRxFrame(data)
if err != nil {
sess.Logger.Warn("error parsing rx packet", "error", err, "data", data)
@ -100,10 +98,8 @@ func (sess *SerialSession) rxHandler() {
sess.Logger.Warn("error writing data", "error", err, "payload", frame.Payload)
}
// the "callback"-style handler. Any received packet with a frame ID should
// be handled here.
case TxStatusType, ATCmdResponseType, RemoteCmdRespType: // these take the frame bytes and parse it themselves.
// we hand it back via the channel. we directly find the ID since it's always
case TxStatusType, ATCmdResponseType, RemoteCmdRespType:
// we hand the frame back via the channel. we directly find the ID since it's always
// the second byte.
idx := data[1]
@ -130,12 +126,13 @@ func (sess *SerialSession) Read(p []byte) (int, error) {
}
func (sess *SerialSession) Write(p []byte) (n int, err error) {
// we construct a packet - using the conntrack to ensure that the packet is okay.
// we block - this is more correct.
sess.Warn("hello")
idx, ch, err := sess.ct.GetMark()
if err != nil {
return
}
n = len(p)
wf := &TxFrame{
Id: idx,
Destination: BroadcastAddr,
@ -144,7 +141,7 @@ func (sess *SerialSession) Write(p []byte) (n int, err error) {
// write the actual packet
sess.writeLock.Lock()
n, err = writeXBeeFrame(sess.port, wf.Bytes())
_, err = writeXBeeFrame(sess.port, wf.Bytes())
sess.writeLock.Unlock()
if err != nil {
return
@ -180,7 +177,6 @@ func (sess *SerialSession) ATCommand(cmd [2]rune, data []byte, queued bool) ([]b
// get a mark for the frame
isQuery := len(data) > 0
idx, ch, err := sess.ct.GetMark()
if err != nil {
return nil, err
@ -195,12 +191,8 @@ func (sess *SerialSession) ATCommand(cmd [2]rune, data []byte, queued bool) ([]b
return nil, fmt.Errorf("error writing xbee frame: %w", err)
}
// we use the AT command that was provided to decode the frame.
// Parse stores the response result locally.
// we parse the base frame ourselves, and if it's okay we pass it
// to the provided ATCommand
// TODO: add timeout.
resp, err := ParseATCmdResponse(<-ch)
if err != nil {
return nil, err
@ -208,20 +200,10 @@ func (sess *SerialSession) ATCommand(cmd [2]rune, data []byte, queued bool) ([]b
if resp.Status != 0 {
// sinec ATCmdStatus is a stringer thanks to the generator
return nil, fmt.Errorf("AT command failed: %v", resp.Status)
return resp.Data, fmt.Errorf("AT command failed: %v", resp.Status)
}
// finally, we use the provided ATCmd interface to unpack the data.
// this overwrites the values provided, but this should only happen
// during a query, so this is fine.
// TODO: skip if not a query command?
if isQuery {
return resp.Data, nil
}
// it's not a query, and there was no error, so we just plain return
return nil, nil
return resp.Data, nil
}
@ -235,6 +217,5 @@ func (sess *SerialSession) Close() error {
return sess.port.Close()
}
func (sess *SerialSession) DiscoverNodes() {
panic("TODO: implement")
}
// next, we define AT commands. These are functions that take in a Session and
// provide wrappers around AT command information, like type checking.