updated README, avoid gooutinges for TCP handling, force disconnects when client is gone.

README.md

@@ -99,8 +99,8 @@ use `rigctl` normally.
 
 ## GPS(d) mode
 
-The PTC offer the possibility to attach a NMEA compatible GNSS receiver to them. To use them with Pat, the 
-PACTOR-TCP-bridge contains a small server which provides a [gpsd](https://gpsd.gitlab.io/gpsd/) compatible server.
+The PTC offer the possibility to attach a NMEA compatible GNSS receiver to it. To use this with Pat, the 
+PACTOR-TCP-bridge contains a small server code which provides a [gpsd](https://gpsd.gitlab.io/gpsd/) compatible TCP socket.
 
 So your setup looks like this:
 

ptc.go

@@ -7,9 +7,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
-	"github.com/TwiN/go-color"
-	"github.com/albenik/go-serial/v2"
-	"github.com/augustoroman/hexdump"
 	"log"
 	"math"
 	"math/bits"
@@ -22,6 +19,10 @@ import (
 	"sync"
 	"time"
 
+	"github.com/TwiN/go-color"
+	"github.com/albenik/go-serial/v2"
+	"github.com/augustoroman/hexdump"
+
 	"github.com/howeyc/crc16"
 )
 
@@ -320,7 +321,7 @@ func (p *Modem) modemThread() {
 	time.Sleep(time.Second)
 	const chunkSize = 1024
 	p.wg.Add(1)
-	for !p.flags.stopmodem {
+	for !(p.flags.stopmodem && s.Command.Cmd.GetLen() == 0) {
 
 		// TX data
 		if p.getNumFramesNotTransmitted() < MaxFrameNotTX {
@@ -358,7 +359,7 @@ func (p *Modem) modemThread() {
 					s.Command.Response.Enqueue(ans[2:])
 				}
 			}
-			writeDebug("Answer from modem: "+ans, 1)
+			writeDebug("Answer from modem: "+hex.EncodeToString([]byte(ans)), 1)
 			// TODO: Catch errors!
 		}
 
@@ -914,7 +915,9 @@ func (p *Modem) read(readsize int) (int, []byte, error) {
 			writeDebug("ERROR in ReadyToRead: "+err.Error(), 3)
 		} else {
 			chunkSize = int(t)
-			writeDebug(fmt.Sprintf("chunksize: %d", chunkSize), 3)
+			if chunkSize > 0 {
+				writeDebug(fmt.Sprintf("chunksize: %d", chunkSize), 3)
+			}
 		}
 	} else {
 		chunkSize = readsize

tcpserver.go

@@ -5,12 +5,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"github.com/TwiN/go-color"
 	"log"
 	"net"
 	"regexp"
 	"strings"
 	"time"
+
+	"github.com/TwiN/go-color"
 )
 
 // Chunks splits a string into chunks of chunkSize length
@@ -41,6 +42,7 @@ func Chunks(s string, chunkSize int) []string {
 func handleTCPCmdConnection(conn net.Conn) {
 	defer func() {
 		s.Status &^= StatusTCPCmdActive
+		s.Command.Cmd.Enqueue("DD") // force stop all connetions if TCP connection is closing
 		err := conn.Close()
 		if err != nil {
 			writeDebug(err.Error(), 0)
@@ -158,7 +160,7 @@ func handleTCPDataConnection(conn net.Conn) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	go func() {
-		for {
+		for ctx.Err() == nil {
 			msg, err := s.Data.Response.DequeueOrWaitContext(ctx, 1)
 			if err != nil {
 				s.Protocol <- fmt.Sprintf(color.InRed("End of TCP Data Connection %s\n"), conn.RemoteAddr())
@@ -326,8 +328,8 @@ func tcpCmdServer(Config *Userconfig) {
 			continue
 		}
 
-		// Handle connection in a separate goroutine
-		go handleTCPCmdConnection(conn)
+		// don't handle in goroutine as you normally would. There shouldn't be more than one connection.
+		handleTCPCmdConnection(conn)
 	}
 }
 
@@ -354,7 +356,7 @@ func tcpDataServer(Config *Userconfig) {
 			continue
 		}
 
-		// Handle connection in a separate goroutine
-		go handleTCPDataConnection(conn)
+		// don't handle in goroutine as you normally would. There shouldn't be more than one connection.
+		handleTCPDataConnection(conn)
 	}
 }