Fix build issue with server

Not useful yet... I thought it would be but I changed my mind...
Need to think about this a lot more

.gitea/workflows/benchmark.yaml

@@ -2,8 +2,7 @@ name: Benchmark BufferPool
 on:
   push:
     branches:
-      - '*'
+      - 'master'
-      - '!benchmark'
 
 jobs:
   RunBenchmarks:

.gitignore

@@ -1 +1,4 @@
 jstester/node_modules
+encoding/tmp
+pdu/tmp
+tmp

benchmark/benchmark.go

@@ -38,7 +38,7 @@ func main() {
 		log.Fatalf("Error creating result file %s with %v", resultFile, err)
 	}
 
-	cmd := exec.Command("go", "test", "-bench", ".", "./pdu")
+	cmd := exec.Command("go", "test", "-bench", ".", "./...")
 	cmd.Dir = "../"
 	cmd.Stdout = outFile
 

client/client.go

@@ -1 +1,165 @@
-package client
+package client
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+	"smpptester/pdu"
+	"smpptester/utils"
+	"time"
+
+	"golang.org/x/time/rate"
+)
+
+var (
+	SMPP_CLIENT_RETRY_TIMEOUT      = 1 * time.Second
+	SMPP_CLIENT_SEND_QUEUE_SIZE    = 1024 * 8
+	SMPP_CLIENT_RECEIVE_QUEUE_SIZE = 1024 * 8
+	SMPP_CLIENT_ASYNC_SEND_WORKERS = 16
+	SMPP_CLIENT_SEND_LIMIT         = 4
+)
+
+type SMPPClient struct {
+	Id           int
+	Connected    bool
+	SendQueue    chan pdu.PDU
+	ReceiveQueue chan pdu.PDU
+	SendLimit    *utils.ReactiveValue[int]
+
+	sendLimiter *rate.Limiter
+	enabled     bool
+	running     bool
+	conn        net.Conn
+	port        string
+	log         log.Logger
+	dcErr       chan (error)
+}
+
+func NewSMPPClient(port string, id int) *SMPPClient {
+	client := &SMPPClient{
+		Id:           id,
+		SendQueue:    make(chan pdu.PDU, SMPP_CLIENT_SEND_QUEUE_SIZE),
+		ReceiveQueue: make(chan pdu.PDU, SMPP_CLIENT_RECEIVE_QUEUE_SIZE),
+		SendLimit:    utils.NewReactiveValue[int](SMPP_CLIENT_SEND_LIMIT),
+
+		sendLimiter: rate.NewLimiter(rate.Limit(SMPP_CLIENT_SEND_LIMIT), SMPP_CLIENT_SEND_LIMIT),
+		port:        port,
+		log:         log.Logger{},
+		dcErr:       make(chan error, 128),
+	}
+	client.log = *log.New(log.Writer(), "", log.LstdFlags|log.Lshortfile)
+	client.log.SetPrefix(fmt.Sprintf("SMPP client %d: ", client.Id))
+
+	go func() {
+		limit := client.SendLimit.Subscribe()
+		defer client.SendLimit.Unsubscribe(limit)
+		for {
+			v := <-limit
+			client.log.Printf("Send limit changed to %d", *v)
+			client.sendLimiter.SetLimit(rate.Limit(*v))
+			client.sendLimiter.SetBurst(*v)
+		}
+	}()
+
+	return client
+}
+
+func (c *SMPPClient) Enable() {
+	if c.enabled {
+		c.log.Printf("SMPP client %d is already enabled", c.Id)
+		return
+	}
+	c.enabled = true
+	c.start()
+	c.log.Printf("SMPP client %d enabled", c.Id)
+}
+func (c *SMPPClient) Disable() {
+	if !c.enabled {
+		c.log.Printf("SMPP client %d is already disabled", c.Id)
+		return
+	}
+	c.enabled = false
+	c.dcErr <- fmt.Errorf("client is disabled")
+	if c.conn != nil {
+		c.conn.Close()
+	}
+	c.log.Printf("SMPP client %d disabled", c.Id)
+}
+
+func (c *SMPPClient) start() {
+	if c.running {
+		c.log.Printf("SMPP client %d is already running", c.Id)
+		return
+	}
+	go func() {
+		c.running = true
+		defer func() {
+			c.running = false
+		}()
+
+		c.log.Printf("SMPP client %d started", c.Id)
+		for {
+			if c.enabled && !c.Connected {
+				c.log.Printf("Trying to connect to %s", c.port)
+				err := c.connect()
+				if err != nil {
+					c.dcErr <- err
+				}
+			}
+			err := <-c.dcErr
+			c.Connected = false
+			if c.enabled {
+				c.log.Printf("Disconnected: '%v' trying again in %d second(s)", err, int(SMPP_CLIENT_RETRY_TIMEOUT.Seconds()))
+				time.Sleep(SMPP_CLIENT_RETRY_TIMEOUT)
+			} else {
+				c.log.Printf("Disconnected: '%v' & client is disabled, quitting", err)
+				break
+			}
+		}
+	}()
+}
+
+func (c *SMPPClient) connect() error {
+	if !c.enabled {
+		return fmt.Errorf("client is not enabled")
+	}
+	if c.Connected {
+		return fmt.Errorf("client is already connected")
+	}
+	conn, err := net.Dial("tcp", c.port)
+	if err != nil {
+		return fmt.Errorf("failed to connect to SMPP server: %w", err)
+	}
+	c.log.Printf("SMPP client %d connected to %s", c.Id, c.port)
+	c.Connected = true
+	c.conn = conn
+	return nil
+}
+
+func (c *SMPPClient) Send(pdata pdu.PDU) error {
+	if c.conn == nil {
+		return fmt.Errorf("connection is not established")
+	}
+
+	pdata.UpdateSize()
+	buf := pdu.ByteBufferPool.Get(pdata.Size())
+	err := pdata.Encode(buf)
+	if err != nil {
+		return fmt.Errorf("failed to encode PDU: %w", err)
+	}
+
+	err = c.sendLimiter.Wait(context.Background())
+	if err != nil {
+		return fmt.Errorf("failed to wait for rate limiter: %w", err)
+	}
+
+	_, err = c.conn.Write(buf.Bytes())
+	if err != nil {
+		c.dcErr <- err
+		return fmt.Errorf("failed to send PDU: %w", err)
+	}
+
+	// c.log.Printf("SMPP client %d sent PDU: %+v", c.Id, pdata)
+	return nil
+}

encoding/.air.toml

@@ -0,0 +1,51 @@
+root = "."
+testdata_dir = "testdata"
+tmp_dir = "tmp"
+
+[build]
+  args_bin = []
+  bin = "tmp\\main.exe"
+  cmd = "go test ."
+  delay = 1000
+  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
+  exclude_file = []
+  exclude_regex = []
+  exclude_unchanged = false
+  follow_symlink = false
+  full_bin = ""
+  include_dir = []
+  include_ext = ["go", "tpl", "tmpl", "html"]
+  include_file = []
+  kill_delay = "0s"
+  log = "build-errors.log"
+  poll = false
+  poll_interval = 0
+  post_cmd = []
+  pre_cmd = []
+  rerun = false
+  rerun_delay = 100
+  send_interrupt = false
+  stop_on_error = false
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  main_only = false
+  time = false
+
+[misc]
+  clean_on_exit = true
+
+[proxy]
+  app_port = 0
+  enabled = false
+  proxy_port = 0
+
+[screen]
+  clear_on_rebuild = true
+  keep_scroll = true

encoding/ascii.go

@@ -0,0 +1,22 @@
+package encoding
+
+import "bytes"
+
+type ASCIICoder struct{}
+
+func (c *ASCIICoder) Encode(s *string, buf *bytes.Buffer) error {
+	// These should be ASCII but UTF8 is a superset of ASCII so hopefully this'll be fine
+	buf.WriteString(*s)
+	return nil
+}
+
+func (c *ASCIICoder) Decode(buf *bytes.Buffer) (string, error) {
+	return buf.String(), nil
+}
+
+func (c ASCIICoder) EncodesInto(s *string) int {
+	return len(*s)
+}
+func (c ASCIICoder) DecodesInto(buf *bytes.Buffer) int {
+	return buf.Len()
+}

encoding/ascii_test.go

@@ -0,0 +1,74 @@
+package encoding
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestASCIIEncodeSimpleASCIIString(t *testing.T) {
+	coder := &ASCIICoder{}
+	var buf bytes.Buffer
+	input := "Hello, World!"
+
+	expected := []byte{72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33}
+	err := coder.Encode(&input, &buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Errorf("Expected %v, but got %v", expected, buf.Bytes())
+	}
+}
+
+func TestASCIIDecodeSimpleASCIIString(t *testing.T) {
+	coder := &ASCIICoder{}
+	var buf bytes.Buffer
+	input := []byte{72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33}
+
+	expected := "Hello, World!"
+	buf.Write(input)
+	output, err := coder.Decode(&buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if output != expected {
+		t.Errorf("Expected %v, but got %v", expected, output)
+	}
+}
+
+func TestASCIIEncodeEmptyString(t *testing.T) {
+	coder := &ASCIICoder{}
+	var buf bytes.Buffer
+	input := ""
+
+	expected := []byte{}
+	err := coder.Encode(&input, &buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Errorf("Expected %v, but got %v", expected, buf.Bytes())
+	}
+}
+
+func TestASCIIDecodeEmptyString(t *testing.T) {
+	coder := &ASCIICoder{}
+	buf := bytes.NewBuffer([]byte{})
+
+	expected := ""
+	output, err := coder.Decode(buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if output != expected {
+		t.Errorf("Expected %v, but got %v", expected, output)
+	}
+}

encoding/charset.json

@@ -0,0 +1,5 @@
+{
+	"ucs2": {
+		"link": "http://www.columbia.edu/kermit/ucs2.html"
+	}
+}

encoding/coder.go

@@ -0,0 +1,10 @@
+package encoding
+
+import "bytes"
+
+type Coder interface {
+	Encode(s *string, buf *bytes.Buffer) error
+	Decode(buf *bytes.Buffer) (string, error)
+	EncodesInto(s *string) int
+	DecodesInto(buf *bytes.Buffer) int
+}

encoding/gsm7.go

@@ -0,0 +1,136 @@
+package encoding
+
+import (
+	"bytes"
+	"fmt"
+)
+
+type GSM7Coder struct{}
+
+// Make sure buffer can fit EncodesInto bytes
+// Otherwise Encode will allocate memory as it sees fit
+// Which is fine but not optimal
+// Preallocate the buffer with the size of EncodesInto bytes
+func (c *GSM7Coder) Encode(s *string, buf *bytes.Buffer) error {
+	// utf8 := *(*[]byte)(unsafe.Pointer(&s))
+	utf8 := []byte(*s)
+	var (
+		offset      int  = 1
+		bitshift    byte = 0
+		leap, shift bool
+	)
+	encodedSize := c.EncodesInto(s)
+	cap := buf.Cap()
+	if cap < encodedSize {
+		buf.Grow(encodedSize - cap)
+	}
+
+	for index, septet := range utf8 {
+		if septet > 0b01111111 {
+			return fmt.Errorf("invalid character at index %d", index)
+		}
+		if index == 0 {
+			continue
+		}
+		bitshift++
+		// log.Printf("Index:%-3d Offset:%-3d Bitshift:%-3d CurrentByte:%08b (%-3d) OffsetByte:%08b (%-3d) Leap:%5v", index, offset, bitshift, utf8[index], utf8[index], utf8[index-offset], utf8[index-offset], leap)
+		mask := byte(255 >> (8 - bitshift))
+		masked := (mask & septet) << (8 - bitshift)
+		// log.Printf("Index:%-3d Offset:%-3d Bitshift:%-3d Mask:%08b Masked:%08b", index, offset, bitshift, mask, masked)
+		if leap {
+			masked >>= 1
+		}
+		utf8[index-offset] |= masked
+		utf8[index] >>= bitshift
+
+		if !leap {
+			buf.WriteByte(utf8[index-offset])
+		}
+		if index == len(utf8)-1 && utf8[index] > 0 {
+			buf.WriteByte(utf8[index])
+		}
+		// log.Printf("Index:%-3d Offset:%-3d Bitshift:%-3d CurrentByte:%08b (%-3d) OffsetByte:%08b (%-3d) Leap:%5v", index, offset, bitshift, utf8[index], utf8[index], utf8[index-offset], utf8[index-offset], leap)
+		if bitshift >= 7 {
+			if leap {
+				// log.Printf("Shift at Index:%-3d Offset:%-3d Bitshift:%-3d", index, offset, bitshift)
+				leap = false
+				bitshift = 0
+				offset++
+				shift = true
+				continue
+			}
+			// log.Printf("Leap at Index:%-3d Offset:%-3d Bitshift:%-3d", index, offset, bitshift)
+			leap = true
+			bitshift = 6
+		}
+		if shift {
+			offset = 1
+		}
+	}
+	return nil
+}
+
+func (c *GSM7Coder) Decode(buf *bytes.Buffer) (string, error) {
+	gsm7 := buf.Bytes()
+	var (
+		offset   int
+		bitshift byte = 0
+		leap     bool
+	)
+	outLength := c.DecodesInto(buf)
+	lengthDiff := outLength - len(gsm7)
+	gsm7 = append(gsm7, make([]byte, lengthDiff)...)
+	start := len(gsm7) - 2
+
+	// We don't care about the last byte
+	// Unless it's the %8.......
+	// We'll deal with that later
+	for index := start; index >= 0; index-- {
+		octet := gsm7[index]
+		bitshift = byte((index % 7) + 1)
+		if bitshift == 7 {
+			leap = true
+		}
+		offset = 1
+		// log.Println(offset, index, index+offset)
+		// log.Printf("Index:%-3d Offset:%-3d Bitshift:%-3d CurrentByte:%08b (%-3d) OffsetByte(%-3d):%08b (%-3d) Leap:%5v", index, offset, bitshift, gsm7[index], gsm7[index], index+offset, gsm7[index+offset], gsm7[index+offset], leap)
+
+		mask := byte(255 << (8 - bitshift))
+		masked := (mask & octet) >> (8 - bitshift)
+		// log.Printf("Index:%-3d Offset:%-3d Bitshift:%-3d Mask:%08b Masked:%08b", index, offset, bitshift, mask, masked)
+		if leap {
+			InsertAt(&gsm7, index+offset, masked)
+		} else {
+			gsm7[index+offset] |= masked
+		}
+		// Remove last bitshift bits
+		gsm7[index] <<= bitshift
+		// Move the remaining bit once to the right to form septet instead of octet
+		gsm7[index] >>= 1
+
+		// log.Printf("Index:%-3d Offset:%-3d Bitshift:%-3d CurrentByte:%08b (%-3d) OffsetByte(%-3d):%08b (%-3d) Leap:%5v", index, offset, bitshift, gsm7[index], gsm7[index], index+offset, gsm7[index+offset], gsm7[index+offset], leap)
+		leap = false
+	}
+	return string(gsm7), nil
+}
+
+// Allocation free
+// Which means data MUST have space for value
+func InsertAt(data *[]byte, index int, value byte) {
+	copy((*data)[index+1:], (*data)[index:])
+	(*data)[index] = value
+}
+
+func (c GSM7Coder) EncodesInto(s *string) int {
+	slen := len(*s)
+	enclen := slen * 7 / 8
+	if slen%8 != 0 {
+		enclen++
+	}
+	return enclen
+}
+func (c GSM7Coder) DecodesInto(buf *bytes.Buffer) int {
+	blen := buf.Len()
+	declen := blen * 8 / 7
+	return declen
+}

encoding/gsm7_test.go

@@ -0,0 +1,369 @@
+package encoding
+
+import (
+	"bytes"
+	"testing"
+)
+
+var (
+	short8nString   = "Sunshine"
+	longNot8nString = "Golden rays play, Chasing night away."
+	long8nString    = "Ducks are fucking great, they quacks, O quackers, what the fuck."
+
+	short8nStringEncodedBytes   = []byte{0b11010011, 0b10111010, 0b01111011, 0b10001110, 0b01001110, 0b10111011, 0b11001011}
+	longNot8nStringEncodedBytes = []byte{0b11000111, 0b00110111, 0b10011011, 0b01011100, 0b01110110, 0b10000011, 0b11100100, 0b11100001, 0b11111100, 0b00011100, 0b00000100, 0b01100111, 0b10000111, 0b11110011, 0b00101100, 0b11010000, 0b00010000, 0b00011101, 0b10011110, 0b10100111, 0b11011101, 0b01100111, 0b10010000, 0b00111011, 0b01111101, 0b01000110, 0b11010011, 0b01000001, 0b11100001, 0b01111011, 0b00111000, 0b11101111, 0b00000010}
+	long8nStringEncodedBytes    = []byte{0b11000100, 0b11111010, 0b01111000, 0b00111101, 0b00000111, 0b10000101, 0b11100101, 0b01100101, 0b10010000, 0b10111001, 0b00111110, 0b01011110, 0b10100111, 0b11011101, 0b01100111, 0b11010000, 0b01011001, 0b01011110, 0b00001110, 0b11010011, 0b01011001, 0b00100000, 0b00111010, 0b10111010, 0b10011100, 0b00000111, 0b11000101, 0b11101011, 0b11100001, 0b11110001, 0b01111010, 0b11001110, 0b00000010, 0b00111101, 0b01000001, 0b11110001, 0b01111010, 0b01111000, 0b10111100, 0b00101110, 0b11001011, 0b11100111, 0b00101100, 0b11010000, 0b00011101, 0b00011101, 0b10100110, 0b10000011, 0b11101000, 0b11101000, 0b00110010, 0b11001000, 0b01011100, 0b00011111, 0b10101111, 0b01011101}
+)
+
+// region encode
+func TestGSM7EncodeSimpleASCIIString(t *testing.T) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := short8nString
+
+	expected := short8nStringEncodedBytes
+	err := coder.Encode(&input, &buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Errorf("Expected '%v', but got '%v'", expected, buf.Bytes())
+	}
+}
+
+func TestGSM7EncodeComplexASCIIString(t *testing.T) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := longNot8nString
+
+	expected := longNot8nStringEncodedBytes
+	err := coder.Encode(&input, &buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Errorf("Expected '%v', but got '%v'", expected, buf.Bytes())
+	}
+}
+
+func TestGSM7EncodeComplex8nASCIIString(t *testing.T) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := "Ducks are fucking great, they quacks, O quackers, what the fuck."
+
+	expected := long8nStringEncodedBytes
+	err := coder.Encode(&input, &buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Errorf("Expected '%v', but got '%v'", expected, buf.Bytes())
+	}
+}
+
+func TestGSM7EncodeDoesNotAllocateMoreThanNecessary(t *testing.T) {
+	coder := &GSM7Coder{}
+	input := "Ducks are fucking great, they quacks, O quackers, what the fuck."
+	buf := bytes.NewBuffer(make([]byte, coder.EncodesInto(&input)))
+	buf.Reset()
+
+	expected := buf.Cap()
+	err := coder.Encode(&input, buf)
+	actual := buf.Cap()
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if actual != expected {
+		t.Errorf("Expected buffer of size %v, but got %v", expected, actual)
+	}
+}
+
+func TestGSM7EncodeDoesAllocateWhenNecessary(t *testing.T) {
+	coder := &GSM7Coder{}
+	input := "Ducks are fucking great, they quacks, O quackers, what the fuck."
+	var buf bytes.Buffer
+	buf.Reset()
+
+	original := buf.Cap()
+	err := coder.Encode(&input, &buf)
+	modified := buf.Cap()
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if !(modified > original) {
+		t.Errorf("Expected buffer to grow but buffer changed from %v to %v", original, modified)
+	}
+}
+
+func TestGSM7EncodeEmptyString(t *testing.T) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := ""
+
+	expected := []byte{}
+	err := coder.Encode(&input, &buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Errorf("Expected '%v', but got '%v'", expected, buf.Bytes())
+	}
+}
+
+// region decode
+func TestGSM7DecodeSimpleASCIIString(t *testing.T) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := short8nStringEncodedBytes
+
+	expected := short8nString
+	buf.Write(input)
+	actual, err := coder.Decode(&buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if actual != expected {
+		t.Errorf("Expected '%v', but got '%v'", expected, actual)
+	}
+}
+
+func TestGSM7DecodeComplexASCIIString(t *testing.T) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := longNot8nStringEncodedBytes
+
+	expected := longNot8nString
+	buf.Write(input)
+	actual, err := coder.Decode(&buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if actual != expected {
+		t.Errorf("Expected '%v', but got '%v'", expected, actual)
+	}
+}
+
+func TestGSM7DecodeComplex8nASCIIString(t *testing.T) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := long8nStringEncodedBytes
+
+	expected := long8nString
+	buf.Write(input)
+	actual, err := coder.Decode(&buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if actual != expected {
+		t.Errorf("Expected '%v', but got '%v'", expected, actual)
+	}
+}
+
+func TestGSM7DecodeEmptyString(t *testing.T) {
+	coder := &GSM7Coder{}
+	buf := bytes.NewBuffer([]byte{})
+
+	expected := ""
+	actual, err := coder.Decode(buf)
+
+	if err != nil {
+		t.Errorf("Expected no error, but got %v", err)
+	}
+
+	if actual != expected {
+		t.Errorf("Expected '%v', but got '%v'", expected, actual)
+	}
+}
+
+// region insertat
+func TestInsertAtBeginning(t *testing.T) {
+	data := []byte{2, 3, 4, 0}
+	InsertAt(&data, 0, 1)
+	expected := []byte{1, 2, 3, 4}
+	if !bytes.Equal(data, expected) {
+		t.Errorf("expected %v, got %v", expected, data)
+	}
+}
+
+func TestInsertInMiddle(t *testing.T) {
+	data := []byte{2, 3, 4, 0}
+	InsertAt(&data, 1, 5)
+	expected := []byte{2, 5, 3, 4}
+	if !bytes.Equal(data, expected) {
+		t.Errorf("expected %v, got %v", expected, data)
+	}
+}
+
+func TestInsertAtEnd(t *testing.T) {
+	data := []byte{1, 2, 3, 0}
+	InsertAt(&data, 3, 4)
+	expected := []byte{1, 2, 3, 4}
+	if !bytes.Equal(data, expected) {
+		t.Errorf("expected %v, got %v", expected, data)
+	}
+}
+
+func TestIndexOutOfBounds(t *testing.T) {
+	data := []byte{2, 3, 4}
+	defer func() {
+		if r := recover(); r == nil {
+			t.Errorf("The code did not panic")
+		}
+	}()
+	InsertAt(&data, 4, 5)
+}
+
+func TestNegativeIndex(t *testing.T) {
+	data := []byte{2, 3, 4}
+	defer func() {
+		if r := recover(); r == nil {
+			t.Errorf("The code did not panic")
+		}
+	}()
+	InsertAt(&data, -1, 1)
+}
+
+func TestMaintainsOrderAfterInsertion(t *testing.T) {
+	data := []byte{2, 3, 4, 0}
+	InsertAt(&data, 1, 1)
+	expected := []byte{2, 1, 3, 4}
+	if !bytes.Equal(data, expected) {
+		t.Errorf("expected %v, got %v", expected, data)
+	}
+}
+
+func TestMaintainsLength(t *testing.T) {
+	data := []byte{2, 3, 4, 0}
+	InsertAt(&data, 1, 1)
+	if len(data) != 4 {
+		t.Errorf("expected length 4, got %d", len(data))
+	}
+}
+
+func TestDeletesLastValue(t *testing.T) {
+	data := []byte{2, 3, 4, 5}
+	InsertAt(&data, 0, 1)
+	expected := []byte{1, 2, 3, 4}
+	if !bytes.Equal(data, expected) {
+		t.Errorf("expected %v, got %v", expected, data)
+	}
+}
+
+// region misc tests
+func TestGSM7EncodesIntoSmallString(t *testing.T) {
+	input := short8nString
+	expected := 7
+	actual := GSM7Coder{}.EncodesInto(&input)
+	if actual != expected {
+		t.Errorf("Expected %d, but got %d", expected, actual)
+	}
+}
+
+func TestGSM7EncodesIntoLargerNot8nString(t *testing.T) {
+	input := longNot8nString
+	expected := 33
+	actual := GSM7Coder{}.EncodesInto(&input)
+	if actual != expected {
+		t.Errorf("Expected %d, but got %d", expected, actual)
+	}
+}
+
+func TestGSM7EncodesIntoLarger8nString(t *testing.T) {
+	input := long8nString
+	expected := 56
+	actual := GSM7Coder{}.EncodesInto(&input)
+	if actual != expected {
+		t.Errorf("Expected %d, but got %d", expected, actual)
+	}
+}
+
+func TestGSM7DecodesIntoSmallString(t *testing.T) {
+	input := short8nStringEncodedBytes
+	expected := 8
+	actual := GSM7Coder{}.DecodesInto(bytes.NewBuffer(input))
+	if actual != expected {
+		t.Errorf("Expected %d, but got %d", expected, actual)
+	}
+}
+
+func TestGSM7DecodesIntoLargerNot8nString(t *testing.T) {
+	input := longNot8nStringEncodedBytes
+	expected := 37
+	actual := GSM7Coder{}.DecodesInto(bytes.NewBuffer(input))
+	if actual != expected {
+		t.Errorf("Expected %d, but got %d", expected, actual)
+	}
+}
+
+func TestGSM7DecodesIntoLarger8nString(t *testing.T) {
+	input := long8nStringEncodedBytes
+	expected := 64
+	actual := GSM7Coder{}.DecodesInto(bytes.NewBuffer(input))
+	if actual != expected {
+		t.Errorf("Expected %d, but got %d", expected, actual)
+	}
+}
+
+// region benchmark
+func BenchmarkGSM7EncodeSimpleASCIIString(b *testing.B) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := short8nString
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		coder.Encode(&input, &buf)
+	}
+}
+
+func BenchmarkGSM7EncodeComplexASCIIString(b *testing.B) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := longNot8nString
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		coder.Encode(&input, &buf)
+	}
+}
+
+func BenchmarkGSM7EncodeComplex8nASCIIString(b *testing.B) {
+	coder := &GSM7Coder{}
+	var buf bytes.Buffer
+	input := long8nString
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		coder.Encode(&input, &buf)
+	}
+}
+
+func BenchmarkGSM7EncodeComplex8nASCIIStringPrealloc(b *testing.B) {
+	coder := &GSM7Coder{}
+	input := long8nString
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		buf := bytes.NewBuffer(make([]byte, coder.EncodesInto(&input)))
+		buf.Reset()
+		coder.Encode(&input, buf)
+	}
+}

encoding/ucs2.go

@@ -0,0 +1,19 @@
+package encoding
+
+import "bytes"
+
+type UCS2Coder struct{}
+
+func (c *UCS2Coder) Encode(s *string, buf *bytes.Buffer) error {
+	panic("UCS2 not implemented yet")
+}
+func (c *UCS2Coder) Decode(buf *bytes.Buffer) (string, error) {
+	panic("UCS2 not implemented yet")
+}
+
+func (c UCS2Coder) EncodesInto(s *string) int {
+	return len(*s) * 2
+}
+func (c UCS2Coder) DecodesInto(buf *bytes.Buffer) int {
+	return buf.Len() / 2
+}

go.mod

@@ -3,6 +3,6 @@ module smpptester
 go 1.22.4
 
 require (
-	github.com/warthog618/sms v0.3.0
 	github.com/yuin/gopher-lua v1.1.1
+	golang.org/x/time v0.5.0
 )

go.sum

@@ -1,16 +1,4 @@
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/warthog618/sms v0.3.0 h1:LYAb5ngmu2qjNExgji3B7xi2tIZ9+DsuE9pC5xs4wwc=
-github.com/warthog618/sms v0.3.0/go.mod h1:+bYZGeBxu003sxD5xhzsrIPBAjPBzTABsRTwSpd7ld4=
 github.com/yuin/gopher-lua v1.1.1 h1:kYKnWBjvbNP4XLT3+bPEwAXJx262OhaHDWDVOPjL46M=
 github.com/yuin/gopher-lua v1.1.1/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
-gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+golang.org/x/time v0.5.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

@@ -4,12 +4,15 @@ import (
 	"bytes"
 	"encoding/binary"
 	"log"
-	"net"
 	"sync"
+	"time"
+
+	"smpptester/client"
+	"smpptester/pdu"
 )
 
 func init() {
-	log.SetFlags(log.Lmicroseconds)
+	log.SetFlags(log.Lmicroseconds | log.Lshortfile)
 }
 
 // Function to create a submit_sm PDU
@@ -29,7 +32,7 @@ func createSubmitSMPDU() []byte {
 	validityPeriod := ""
 	registeredDelivery := byte(0x01)
 	replaceIfPresentFlag := byte(0x00)
-	dataCoding := byte(0x00)
+	dataCoding := byte(0x01)
 	smDefaultMsgID := byte(0x00)
 	shortMessage := "Hello, SMPP!"
 
@@ -37,7 +40,6 @@ func createSubmitSMPDU() []byte {
 	headerLength := 16
 	bodyLength := 1 + len(serviceType) + 1 + 1 + len(sourceAddr) + 1 + 1 + len(destinationAddr) + 1 + 1 + len(scheduleDeliveryTime) + 1 + len(validityPeriod) + 1 + 1 + 1 + 1 + 1 + len(shortMessage)
 	totalLength := headerLength + bodyLength
-	log.Printf("Total length: %d", totalLength)
 
 	// Create a buffer to hold the PDU
 	var buffer bytes.Buffer
@@ -136,28 +138,55 @@ func main() {
 	// 		go handleConnection(conn)
 	// 	}
 	// }()
-	log.Println(createSubmitSMPDU())
+	submit := &pdu.SUBMIT_SM{
+		Header: &pdu.PDU_HEADER{
+			Command_length:  0,
+			Command_id:      4,
+			Command_status:  0,
+			Sequence_number: 1,
+		},
+		Service_type:           "hehe",
+		Source_addr_ton:        0x01,
+		Source_addr_npi:        0x01,
+		Source_addr:            "12345",
+		Dest_addr_ton:          0x01,
+		Dest_addr_npi:          0x01,
+		Destination_addr:       "67890",
+		Esm_class:              0x00,
+		Protocol_id:            0x00,
+		Priority_flag:          0x00,
+		Schedule_delivery_time: "",
+		Validity_period:        "",
+		Registered_delivery:    0x01,
+		Replace_if_present:     0x00,
+		Data_coding:            0x01,
+		Sm_default_msg_id:      0x00,
+		Short_message:          "Hello, SMPP!",
+	}
+	submit.UpdateSize()
+	buf := pdu.ByteBufferPool.Get(submit.Size())
+	defer pdu.ByteBufferPool.Put(buf)
+	submit.Encode(buf)
 
 	wg := &sync.WaitGroup{}
 	wg.Add(1)
 
-	conn, err := net.Dial("tcp", "localhost:2775")
+	client := client.NewSMPPClient("localhost:2775", 1)
-	if err != nil {
+	client.Enable()	
-		log.Printf("Failed to connect to SMPP server: %+v", err)
+	for {
-		return
+		if client.Connected {
-	}
+			// err := client.Send(submit)
-	log.Printf("Connected to SMPP server")
+			// if err != nil {
-	defer conn.Close()
+			// 	log.Printf("Failed to send PDU: %v", err)
-
+			// }
-	go func() {
+			go client.Send(submit)
-		conn.Write(createSubmitSMPDU())
+			// if rand.Int() % 1000 == 0 {
-		data, err := conn.Read(make([]byte, 1024))
+			// 	client.SendLimit.Set(rand.Int() % 1000)
-		if err != nil {
+			// }
-			log.Printf("Failed to read from connection: %+v", err)
-			return
 		}
-		log.Printf("Received data: %#v", data)
+		time.Sleep(500 * time.Millisecond)
-	}()
+	}
+	log.Println("Are we done")
 
 	wg.Wait()
 }

pdu/.air.toml

@@ -0,0 +1,51 @@
+root = "."
+testdata_dir = "testdata"
+tmp_dir = "tmp"
+
+[build]
+  args_bin = []
+  bin = "tmp\\main.exe"
+  cmd = "go test ."
+  delay = 1000
+  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
+  exclude_file = []
+  exclude_regex = []
+  exclude_unchanged = false
+  follow_symlink = false
+  full_bin = ""
+  include_dir = []
+  include_ext = ["go", "tpl", "tmpl", "html"]
+  include_file = []
+  kill_delay = "0s"
+  log = "build-errors.log"
+  poll = false
+  poll_interval = 0
+  post_cmd = []
+  pre_cmd = []
+  rerun = false
+  rerun_delay = 500
+  send_interrupt = false
+  stop_on_error = false
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  main_only = false
+  time = false
+
+[misc]
+  clean_on_exit = false
+
+[proxy]
+  app_port = 0
+  enabled = false
+  proxy_port = 0
+
+[screen]
+  clear_on_rebuild = false
+  keep_scroll = true

pdu/bind.go

@@ -2,19 +2,19 @@ package pdu
 
 type (
 	BIND struct {
-		header            *PDU_HEADER
+		Header            *PDU_HEADER
-		system_id         string
+		System_id         string
-		password          string
+		Password          string
-		system_type       string
+		System_type       string
-		interface_version byte
+		Interface_version byte
-		addr_ton          byte
+		Addr_ton          byte
-		addr_npi          byte
+		Addr_npi          byte
-		address_range     string
+		Address_range     string
 	}
 	BIND_RESP struct {
-		header               *PDU_HEADER
+		Header               *PDU_HEADER
-		system_id            string
+		System_id            string
-		sc_interface_version byte
+		Sc_interface_version byte
 	}
 	BIND_RECVEIVER struct {
 		BIND
@@ -36,9 +36,9 @@ type (
 	}
 
 	UNBIND struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 	}
 	UNBIND_RESP struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 	}
 )

pdu/cancel.go

@@ -2,17 +2,17 @@ package pdu
 
 type (
 	CANCEL_SM struct {
-		header           *PDU_HEADER
+		Header           *PDU_HEADER
-		service_type     string
+		Service_type     string
-		message_id       string
+		Message_id       string
-		source_addr_ton  byte
+		Source_addr_ton  byte
-		source_addr_npi  byte
+		Source_addr_npi  byte
-		source_addr      string
+		Source_addr      string
-		dest_addr_ton    byte
+		Dest_addr_ton    byte
-		dest_addr_npi    byte
+		Dest_addr_npi    byte
-		destination_addr string
+		Destination_addr string
 	}
 	CANCEL_SM_RESP struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 	}
 )

pdu/deliver.go

@@ -2,11 +2,11 @@ package pdu
 
 type (
 	DELIVER_SM struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 		SUBMIT_SM
 	}
 	DELIVER_SM_RESP struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 		SUBMIT_SM_RESP
 	}
 )

pdu/enquire.go

@@ -2,9 +2,9 @@ package pdu
 
 type (
 	ENQUIRE_LINK struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 	}
 	ENQUIRE_LINK_RESP struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 	}
 )

pdu/pdu.go

@@ -16,14 +16,14 @@ type (
 	}
 
 	PDU_HEADER struct {
-		command_length  uint32
+		Command_length  uint32
-		command_id      uint32
+		Command_id      uint32
-		command_status  uint32
+		Command_status  uint32
-		sequence_number uint32
+		Sequence_number uint32
 	}
 
 	GENERIC_NACK struct {
-		header *PDU_HEADER
+		Header *PDU_HEADER
 	}
 )
 
@@ -62,25 +62,25 @@ func (p *PDU_HEADER) Encode(buf *bytes.Buffer) error {
 	if buf == nil {
 		return fmt.Errorf("cannot encode into nil buffer")
 	}
-	binary.Write(buf, binary.BigEndian, p.command_length)
+	binary.Write(buf, binary.BigEndian, p.Command_length)
-	binary.Write(buf, binary.BigEndian, p.command_id)
+	binary.Write(buf, binary.BigEndian, p.Command_id)
-	binary.Write(buf, binary.BigEndian, p.command_status)
+	binary.Write(buf, binary.BigEndian, p.Command_status)
-	binary.Write(buf, binary.BigEndian, p.sequence_number)
+	binary.Write(buf, binary.BigEndian, p.Sequence_number)
 	return nil
 }
 func (p *PDU_HEADER) Decode(buf *bytes.Buffer) error {
 	if buf == nil {
 		return fmt.Errorf("cannot decode nil buffer")
 	}
-	binary.Read(buf, binary.BigEndian, &p.command_length)
+	binary.Read(buf, binary.BigEndian, &p.Command_length)
-	binary.Read(buf, binary.BigEndian, &p.command_id)
+	binary.Read(buf, binary.BigEndian, &p.Command_id)
-	binary.Read(buf, binary.BigEndian, &p.command_status)
+	binary.Read(buf, binary.BigEndian, &p.Command_status)
-	binary.Read(buf, binary.BigEndian, &p.sequence_number)
+	binary.Read(buf, binary.BigEndian, &p.Sequence_number)
 	return nil
 }
 func (p *PDU_HEADER) Size() int {
 	return 16
 }
 func (p *PDU_HEADER) UpdateSize() {
-	p.command_length = uint32(p.Size())
+	p.Command_length = uint32(p.Size())
-}
+}

pdu/pdu_test.go

@@ -11,10 +11,10 @@ import (
 // region encode
 func TestEncodeReturnsByteSliceOfLength16(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  1,
+		Command_length:  1,
-		command_id:      1,
+		Command_id:      1,
-		command_status:  1,
+		Command_status:  1,
-		sequence_number: 1,
+		Sequence_number: 1,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -30,10 +30,10 @@ func TestEncodeReturnsByteSliceOfLength16(t *testing.T) {
 
 func TestEncodeHandlesZeroValues(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  0,
+		Command_length:  0,
-		command_id:      0,
+		Command_id:      0,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 0,
+		Sequence_number: 0,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -53,10 +53,10 @@ func TestEncodeHandlesZeroValues(t *testing.T) {
 
 func TestEncodeEncodesProperly(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  1,
+		Command_length:  1,
-		command_id:      2,
+		Command_id:      2,
-		command_status:  3,
+		Command_status:  3,
-		sequence_number: 4,
+		Sequence_number: 4,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -77,10 +77,10 @@ func TestEncodeEncodesProperly(t *testing.T) {
 
 func TestEncodeEncodesProperlyComplex(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  13426724,
+		Command_length:  13426724,
-		command_id:      254352,
+		Command_id:      254352,
-		command_status:  35634264,
+		Command_status:  35634264,
-		sequence_number: 476543523,
+		Sequence_number: 476543523,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -101,10 +101,10 @@ func TestEncodeEncodesProperlyComplex(t *testing.T) {
 
 func TestEncodeIntoCorrectlyEncodesFields(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  16,
+		Command_length:  16,
-		command_id:      1,
+		Command_id:      1,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 12345,
+		Sequence_number: 12345,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -115,26 +115,26 @@ func TestEncodeIntoCorrectlyEncodesFields(t *testing.T) {
 	}
 
 	innerbuf := buf.Bytes()
-	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.command_length {
+	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.Command_length {
-		t.Errorf("Expected command_length %d, got %d", p.command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
+		t.Errorf("Expected command_length %d, got %d", p.Command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.command_id {
+	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.Command_id {
-		t.Errorf("Expected command_id %d, got %d", p.command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
+		t.Errorf("Expected command_id %d, got %d", p.Command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.command_status {
+	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.Command_status {
-		t.Errorf("Expected command_status %d, got %d", p.command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
+		t.Errorf("Expected command_status %d, got %d", p.Command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.sequence_number {
+	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.Sequence_number {
-		t.Errorf("Expected sequence_number %d, got %d", p.sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
+		t.Errorf("Expected sequence_number %d, got %d", p.Sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
 	}
 }
 
 func TestEncodeIntoHandlesLargerBuffer(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  16,
+		Command_length:  16,
-		command_id:      1,
+		Command_id:      1,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 12345,
+		Sequence_number: 12345,
 	}
 	buf := bytes.NewBuffer(make([]byte, 20)) // larger buffer size
 	buf.Reset()
@@ -145,26 +145,26 @@ func TestEncodeIntoHandlesLargerBuffer(t *testing.T) {
 	}
 
 	innerbuf := buf.Bytes()
-	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.command_length {
+	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.Command_length {
-		t.Errorf("Expected command_length %d, got %d", p.command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
+		t.Errorf("Expected command_length %d, got %d", p.Command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.command_id {
+	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.Command_id {
-		t.Errorf("Expected command_id %d, got %d", p.command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
+		t.Errorf("Expected command_id %d, got %d", p.Command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.command_status {
+	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.Command_status {
-		t.Errorf("Expected command_status %d, got %d", p.command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
+		t.Errorf("Expected command_status %d, got %d", p.Command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.sequence_number {
+	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.Sequence_number {
-		t.Errorf("Expected sequence_number %d, got %d", p.sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
+		t.Errorf("Expected sequence_number %d, got %d", p.Sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
 	}
 }
 
 func TestEncodeIntoUsesBigEndianEncoding(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  16,
+		Command_length:  16,
-		command_id:      1,
+		Command_id:      1,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 12345,
+		Sequence_number: 12345,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -175,26 +175,26 @@ func TestEncodeIntoUsesBigEndianEncoding(t *testing.T) {
 	}
 
 	innerbuf := buf.Bytes()
-	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.command_length {
+	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.Command_length {
-		t.Errorf("Expected command_length %d, got %d", p.command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
+		t.Errorf("Expected command_length %d, got %d", p.Command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.command_id {
+	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.Command_id {
-		t.Errorf("Expected command_id %d, got %d", p.command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
+		t.Errorf("Expected command_id %d, got %d", p.Command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.command_status {
+	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.Command_status {
-		t.Errorf("Expected command_status %d, got %d", p.command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
+		t.Errorf("Expected command_status %d, got %d", p.Command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.sequence_number {
+	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.Sequence_number {
-		t.Errorf("Expected sequence_number %d, got %d", p.sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
+		t.Errorf("Expected sequence_number %d, got %d", p.Sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
 	}
 }
 
 func TestEncodeIntoConcurrencySafety(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  16,
+		Command_length:  16,
-		command_id:      1,
+		Command_id:      1,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 12345,
+		Sequence_number: 12345,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -209,26 +209,26 @@ func TestEncodeIntoConcurrencySafety(t *testing.T) {
 	wg.Wait()
 
 	innerbuf := buf.Bytes()
-	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.command_length {
+	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.Command_length {
-		t.Errorf("Expected command_length %d, got %d", p.command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
+		t.Errorf("Expected command_length %d, got %d", p.Command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.command_id {
+	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.Command_id {
-		t.Errorf("Expected command_id %d, got %d", p.command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
+		t.Errorf("Expected command_id %d, got %d", p.Command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.command_status {
+	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.Command_status {
-		t.Errorf("Expected command_status %d, got %d", p.command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
+		t.Errorf("Expected command_status %d, got %d", p.Command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.sequence_number {
+	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.Sequence_number {
-		t.Errorf("Expected sequence_number %d, got %d", p.sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
+		t.Errorf("Expected sequence_number %d, got %d", p.Sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
 	}
 }
 
 func TestEncodeIntoWithMaximumValues(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  math.MaxUint32,
+		Command_length:  math.MaxUint32,
-		command_id:      math.MaxUint32,
+		Command_id:      math.MaxUint32,
-		command_status:  math.MaxUint32,
+		Command_status:  math.MaxUint32,
-		sequence_number: math.MaxUint32,
+		Sequence_number: math.MaxUint32,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -239,26 +239,26 @@ func TestEncodeIntoWithMaximumValues(t *testing.T) {
 	}
 
 	innerbuf := buf.Bytes()
-	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.command_length {
+	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.Command_length {
-		t.Errorf("Expected command_length %d, got %d", p.command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
+		t.Errorf("Expected command_length %d, got %d", p.Command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.command_id {
+	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.Command_id {
-		t.Errorf("Expected command_id %d, got %d", p.command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
+		t.Errorf("Expected command_id %d, got %d", p.Command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.command_status {
+	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.Command_status {
-		t.Errorf("Expected command_status %d, got %d", p.command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
+		t.Errorf("Expected command_status %d, got %d", p.Command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.sequence_number {
+	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.Sequence_number {
-		t.Errorf("Expected sequence_number %d, got %d", p.sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
+		t.Errorf("Expected sequence_number %d, got %d", p.Sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
 	}
 }
 
 func TestEncodeIntoWithBoundaryValues(t *testing.T) {
 	p := &PDU_HEADER{
-		command_length:  0,
+		Command_length:  0,
-		command_id:      0,
+		Command_id:      0,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 0,
+		Sequence_number: 0,
 	}
 	buf := bytes.NewBuffer(make([]byte, 16))
 	buf.Reset()
@@ -269,17 +269,17 @@ func TestEncodeIntoWithBoundaryValues(t *testing.T) {
 	}
 
 	innerbuf := buf.Bytes()
-	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.command_length {
+	if binary.BigEndian.Uint32(innerbuf[0:4]) != p.Command_length {
-		t.Errorf("Expected command_length %d, got %d", p.command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
+		t.Errorf("Expected command_length %d, got %d", p.Command_length, binary.BigEndian.Uint32(innerbuf[0:4]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.command_id {
+	if binary.BigEndian.Uint32(innerbuf[4:8]) != p.Command_id {
-		t.Errorf("Expected command_id %d, got %d", p.command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
+		t.Errorf("Expected command_id %d, got %d", p.Command_id, binary.BigEndian.Uint32(innerbuf[4:8]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.command_status {
+	if binary.BigEndian.Uint32(innerbuf[8:12]) != p.Command_status {
-		t.Errorf("Expected command_status %d, got %d", p.command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
+		t.Errorf("Expected command_status %d, got %d", p.Command_status, binary.BigEndian.Uint32(innerbuf[8:12]))
 	}
-	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.sequence_number {
+	if binary.BigEndian.Uint32(innerbuf[12:16]) != p.Sequence_number {
-		t.Errorf("Expected sequence_number %d, got %d", p.sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
+		t.Errorf("Expected sequence_number %d, got %d", p.Sequence_number, binary.BigEndian.Uint32(innerbuf[12:16]))
 	}
 }
 
@@ -307,17 +307,17 @@ func TestDecodeParsesValidByteSlice(t *testing.T) {
 		t.Errorf("Expected no error, got %v", err)
 	}
 
-	if p.command_length != 16 {
+	if p.Command_length != 16 {
-		t.Errorf("Expected command_length to be 16, got %d", p.command_length)
+		t.Errorf("Expected command_length to be 16, got %d", p.Command_length)
 	}
-	if p.command_id != 1 {
+	if p.Command_id != 1 {
-		t.Errorf("Expected command_id to be 1, got %d", p.command_id)
+		t.Errorf("Expected command_id to be 1, got %d", p.Command_id)
 	}
-	if p.command_status != 2 {
+	if p.Command_status != 2 {
-		t.Errorf("Expected command_status to be 2, got %d", p.command_status)
+		t.Errorf("Expected command_status to be 2, got %d", p.Command_status)
 	}
-	if p.sequence_number != 3 {
+	if p.Sequence_number != 3 {
-		t.Errorf("Expected sequence_number to be 3, got %d", p.sequence_number)
+		t.Errorf("Expected sequence_number to be 3, got %d", p.Sequence_number)
 	}
 }
 
@@ -343,17 +343,17 @@ func TestDecodeHandlesNilDataInput(t *testing.T) {
 		t.Errorf("Expected error, got none")
 	}
 
-	if p.command_length != 0 {
+	if p.Command_length != 0 {
-		t.Errorf("Expected command_length to be 0, got %d", p.command_length)
+		t.Errorf("Expected command_length to be 0, got %d", p.Command_length)
 	}
-	if p.command_id != 0 {
+	if p.Command_id != 0 {
-		t.Errorf("Expected command_id to be 0, got %d", p.command_id)
+		t.Errorf("Expected command_id to be 0, got %d", p.Command_id)
 	}
-	if p.command_status != 0 {
+	if p.Command_status != 0 {
-		t.Errorf("Expected command_status to be 0, got %d", p.command_status)
+		t.Errorf("Expected command_status to be 0, got %d", p.Command_status)
 	}
-	if p.sequence_number != 0 {
+	if p.Sequence_number != 0 {
-		t.Errorf("Expected sequence_number to be 0, got %d", p.sequence_number)
+		t.Errorf("Expected sequence_number to be 0, got %d", p.Sequence_number)
 	}
 }
 
@@ -366,17 +366,17 @@ func TestDecodeHandlesEmptyByteSliceGracefully(t *testing.T) {
 		t.Errorf("Expected no error, got %v", err)
 	}
 
-	if p.command_length != 0 {
+	if p.Command_length != 0 {
-		t.Errorf("Expected command_length to be 0, got %d", p.command_length)
+		t.Errorf("Expected command_length to be 0, got %d", p.Command_length)
 	}
-	if p.command_id != 0 {
+	if p.Command_id != 0 {
-		t.Errorf("Expected command_id to be 0, got %d", p.command_id)
+		t.Errorf("Expected command_id to be 0, got %d", p.Command_id)
 	}
-	if p.command_status != 0 {
+	if p.Command_status != 0 {
-		t.Errorf("Expected command_status to be 0, got %d", p.command_status)
+		t.Errorf("Expected command_status to be 0, got %d", p.Command_status)
 	}
-	if p.sequence_number != 0 {
+	if p.Sequence_number != 0 {
-		t.Errorf("Expected sequence_number to be 0, got %d", p.sequence_number)
+		t.Errorf("Expected sequence_number to be 0, got %d", p.Sequence_number)
 	}
 }
 
@@ -408,11 +408,11 @@ func TestDecodeHandlesByteSlicesWithMaxUint32Values(t *testing.T) {
 		t.Errorf("Expected no error, got %v", err)
 	}
 
-	if p.command_length != math.MaxUint32 {
+	if p.Command_length != math.MaxUint32 {
-		t.Errorf("Expected command_length to be %d, got %d", math.MaxUint32, p.command_length)
+		t.Errorf("Expected command_length to be %d, got %d", math.MaxUint32, p.Command_length)
 	}
-	if p.command_id != math.MaxUint32 {
+	if p.Command_id != math.MaxUint32 {
-		t.Errorf("Expected command_id to be %d, got %d", math.MaxUint32, p.command_id)
+		t.Errorf("Expected command_id to be %d, got %d", math.MaxUint32, p.Command_id)
 	}
 }
 
@@ -425,11 +425,11 @@ func TestDecodeHandlesByteSlicesWithMinimumUint32Values(t *testing.T) {
 		t.Errorf("Expected no error, got %v", err)
 	}
 
-	if p.command_length != 0 {
+	if p.Command_length != 0 {
-		t.Errorf("Expected command_length to be 0, got %d", p.command_length)
+		t.Errorf("Expected command_length to be 0, got %d", p.Command_length)
 	}
-	if p.command_id != 0 {
+	if p.Command_id != 0 {
-		t.Errorf("Expected command_id to be 0, got %d", p.command_id)
+		t.Errorf("Expected command_id to be 0, got %d", p.Command_id)
 	}
 }
 
@@ -445,10 +445,10 @@ func TestSizeReturns16(t *testing.T) {
 // With buffer pool
 func BenchmarkEncodeWithBufferPool(b *testing.B) {
 	p := &PDU_HEADER{
-		command_length:  16,
+		Command_length:  16,
-		command_id:      1,
+		Command_id:      1,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 12345,
+		Sequence_number: 12345,
 	}
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
@@ -461,10 +461,10 @@ func BenchmarkEncodeWithBufferPool(b *testing.B) {
 // Without buffer pool
 func BenchmarkEncodeWithoutBufferPool(b *testing.B) {
 	p := &PDU_HEADER{
-		command_length:  16,
+		Command_length:  16,
-		command_id:      1,
+		Command_id:      1,
-		command_status:  0,
+		Command_status:  0,
-		sequence_number: 12345,
+		Sequence_number: 12345,
 	}
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {

pdu/submit.go

@@ -2,34 +2,33 @@ package pdu
 
 import (
 	"bytes"
-	"encoding/ascii85"
 	"encoding/binary"
 	"fmt"
 
-	"github.com/warthog618/sms/encoding/gsm7"
+	"smpptester/encoding"
 )
 
 type (
 	SUBMIT_SM struct {
-		header                 *PDU_HEADER
+		Header                 *PDU_HEADER
-		service_type           string
+		Service_type           string
-		source_addr_ton        byte
+		Source_addr_ton        byte
-		source_addr_npi        byte
+		Source_addr_npi        byte
-		source_addr            string
+		Source_addr            string
-		dest_addr_ton          byte
+		Dest_addr_ton          byte
-		dest_addr_npi          byte
+		Dest_addr_npi          byte
-		destination_addr       string
+		Destination_addr       string
-		esm_class              byte
+		Esm_class              byte
-		protocol_id            byte
+		Protocol_id            byte
-		priority_flag          byte
+		Priority_flag          byte
-		schedule_delivery_time string
+		Schedule_delivery_time string
-		validity_period        string
+		Validity_period        string
-		registered_delivery    byte
+		Registered_delivery    byte
-		replace_if_present     byte
+		Replace_if_present     byte
-		data_coding            byte
+		Data_coding            byte
-		sm_default_msg_id      byte
+		Sm_default_msg_id      byte
-		sm_length              byte
+		Sm_length              byte
-		short_message          string
+		Short_message          string
 		// user_message_reference uint16
 		// source_port               uint16
 		// source_addr_subunit       byte
@@ -60,51 +59,50 @@ type (
 		// ussd_service_op           byte
 	}
 	SUBMIT_SM_RESP struct {
-		header     *PDU_HEADER
+		Header     *PDU_HEADER
-		message_id string
+		Message_id string
 	}
 	SUBMIT_MULTI      struct{}
 	SUBMIT_MULTI_RESP struct{}
 )
 
+// See https://www.codeproject.com/Tips/470755/Encoding-Decoding-7-bit-User-Data-for-SMS-PDU-PDU
+// Another great site: https://doubleblak.com/blogPost.php?k=7bitpdu
+
 func (p *SUBMIT_SM) Encode(buf *bytes.Buffer) error {
 	if buf == nil {
 		return fmt.Errorf("cannot encode into nil buffer")
 	}
-	asciiEncoder := ascii85.NewEncoder(buf)
+	messageEncoder := p.GetEncoder()
-	// TODO: Implement encodings bsed on p.data_coding
-	messageEncoder := gsm7.NewEncoder()
 
-	p.header.Encode(buf)
+	p.Header.Encode(buf)
-	asciiEncoder.Write([]byte(p.service_type))
+	// These should be ASCII but UTF8 is a superset of ASCII so hopefully this'll be fine
+	buf.WriteString(p.Service_type)
 	buf.Write(NULL_ARR)
-	asciiEncoder.Write([]byte(p.service_type))
+	binary.Write(buf, binary.BigEndian, p.Source_addr_ton)
+	binary.Write(buf, binary.BigEndian, p.Source_addr_npi)
+	buf.WriteString(p.Source_addr)
 	buf.Write(NULL_ARR)
-	binary.Write(buf, binary.BigEndian, p.source_addr_ton)
+	binary.Write(buf, binary.BigEndian, p.Dest_addr_ton)
-	binary.Write(buf, binary.BigEndian, p.source_addr_npi)
+	binary.Write(buf, binary.BigEndian, p.Dest_addr_npi)
-	asciiEncoder.Write([]byte(p.source_addr))
+	buf.WriteString(p.Destination_addr)
 	buf.Write(NULL_ARR)
-	binary.Write(buf, binary.BigEndian, p.dest_addr_ton)
+	binary.Write(buf, binary.BigEndian, p.Esm_class)
-	binary.Write(buf, binary.BigEndian, p.dest_addr_npi)
+	binary.Write(buf, binary.BigEndian, p.Protocol_id)
-	asciiEncoder.Write([]byte(p.destination_addr))
+	binary.Write(buf, binary.BigEndian, p.Priority_flag)
+	buf.WriteString(p.Schedule_delivery_time)
 	buf.Write(NULL_ARR)
-	binary.Write(buf, binary.BigEndian, p.esm_class)
+	buf.WriteString(p.Validity_period)
-	binary.Write(buf, binary.BigEndian, p.protocol_id)
-	binary.Write(buf, binary.BigEndian, p.priority_flag)
-	asciiEncoder.Write([]byte(p.schedule_delivery_time))
 	buf.Write(NULL_ARR)
-	asciiEncoder.Write([]byte(p.validity_period))
+	binary.Write(buf, binary.BigEndian, p.Registered_delivery)
-	buf.Write(NULL_ARR)
+	binary.Write(buf, binary.BigEndian, p.Replace_if_present)
-	binary.Write(buf, binary.BigEndian, p.registered_delivery)
+	binary.Write(buf, binary.BigEndian, p.Data_coding)
-	binary.Write(buf, binary.BigEndian, p.replace_if_present)
+	binary.Write(buf, binary.BigEndian, p.Sm_default_msg_id)
-	binary.Write(buf, binary.BigEndian, p.data_coding)
+	binary.Write(buf, binary.BigEndian, p.Sm_length)
-	binary.Write(buf, binary.BigEndian, p.sm_default_msg_id)
+	err := messageEncoder.Encode(&p.Short_message, buf)
-	binary.Write(buf, binary.BigEndian, p.sm_length)
-	encodedMsg, err := messageEncoder.Encode([]byte(p.short_message))
 	if err != nil {
 		return err
 	}
-	buf.Write(encodedMsg)
 	return nil
 }
 func (p *SUBMIT_SM) Decode(buf *bytes.Buffer) error {
@@ -115,38 +113,42 @@ func (p *SUBMIT_SM) Decode(buf *bytes.Buffer) error {
 }
 func (p *SUBMIT_SM) Size() int {
 	var size int
-	size += p.header.Size()
+	size += p.Header.Size()
-	size += 1 + len(p.service_type)
+	size += 1 + len(p.Service_type)
 	size += 1 // source_addr_ton
 	size += 1 // source_addr_npi
-	size += 1 + len(p.source_addr)
+	size += 1 + len(p.Source_addr)
 	size += 1 // dest_addr_ton
 	size += 1 // dest_addr_npi
-	size += 1 + len(p.destination_addr)
+	size += 1 + len(p.Destination_addr)
 	size += 1 // esm_class
 	size += 1 // protocol_id
 	size += 1 // priority_flag
-	size += 1 + len(p.schedule_delivery_time)
+	size += 1 + len(p.Schedule_delivery_time)
-	size += 1 + len(p.validity_period)
+	size += 1 + len(p.Validity_period)
 	size += 1 // registered_delivery
 	size += 1 // replace_if_present
 	size += 1 // data_coding
 	size += 1 // sm_default_msg_id
 	size += 1 // sm_length
-	// TODO: Handle encoding based on p.data_coding
+	size += p.GetEncoder().EncodesInto(&p.Short_message)
-	switch p.data_coding {
-	case 0b00000000: // GSM7
-		size += (len(p.short_message)*7 + 8 - 1) / 8
-	case 0b00000001: // ASCII
-		size += len(p.short_message)
-	case 0b00000011: // LATIN1
-		size += len(p.short_message)
-	case 0b00001000: // UCS2
-		size += len(p.short_message) * 2
-	}
 	return size
 }
 func (p *SUBMIT_SM) UpdateSize() {
-	p.header.command_length = uint32(p.Size())
+	p.Header.Command_length = uint32(p.Size())
-	p.sm_length = byte(len(p.short_message))
+	p.Sm_length = byte(p.GetEncoder().EncodesInto(&p.Short_message))
+}
+func (p *SUBMIT_SM) GetEncoder() encoding.Coder {
+	switch p.Data_coding {
+	case 0b00000000: // GSM7
+		return &encoding.GSM7Coder{}
+	case 0b00000001: // ASCII
+		return &encoding.ASCIICoder{}
+	// case 0b00000011: // LATIN1
+	// 	return &encoding.LATIN1Coder{}
+	case 0b00001000: // UCS2
+		return &encoding.UCS2Coder{}
+	default:
+		return &encoding.ASCIICoder{}
+	}
 }

pdu/submit_test.go

@@ -9,28 +9,28 @@ import (
 // See examples: https://www.openmarket.com/docs/Content/apis/v4smpp/mt-examples.htm
 func TestEncodeFunctionCorrectlyEncodesAllFields(t *testing.T) {
 	p := &SUBMIT_SM{
-		header: &PDU_HEADER{
+		Header: &PDU_HEADER{
-			command_length:  0,
+			Command_length:  0,
-			command_id:      4,
+			Command_id:      4,
-			command_status:  0,
+			Command_status:  0,
-			sequence_number: 378019,
+			Sequence_number: 378019,
 		},
-		service_type:           "OMV4",
+		Service_type:           "OMV4",
-		source_addr_ton:        3,
+		Source_addr_ton:        3,
-		source_addr_npi:        1,
+		Source_addr_npi:        1,
-		source_addr:            "80362",
+		Source_addr:            "80362",
-		dest_addr_ton:          1,
+		Dest_addr_ton:          1,
-		dest_addr_npi:          1,
+		Dest_addr_npi:          1,
-		destination_addr:       "812345001000",
+		Destination_addr:       "812345001000",
-		esm_class:              0,
+		Esm_class:              0,
-		protocol_id:            0,
+		Protocol_id:            0,
-		priority_flag:          0,
+		Priority_flag:          0,
-		schedule_delivery_time: "",
+		Schedule_delivery_time: "",
-		validity_period:        "180105120000004+",
+		Validity_period:        "180105120000004+",
-		registered_delivery:    1,
+		Registered_delivery:    1,
-		data_coding:            1, // The example uses 0 and claims to use GSM but the message is encoded as ASCII...
+		Data_coding:            1, // The example uses 0 and claims to use GSM but the message is encoded as ASCII...
-		sm_default_msg_id:      0,
+		Sm_default_msg_id:      0,
-		short_message:          "Reply Yes to opt in or No to opt out.",
+		Short_message:          "Reply Yes to opt in or No to opt out.",
 	}
 	p.UpdateSize()
 	buf := ByteBufferPool.Get(p.Size())
@@ -39,45 +39,81 @@ func TestEncodeFunctionCorrectlyEncodesAllFields(t *testing.T) {
 		t.Fatalf("expected no error, got %v", err)
 	}
 
-	expected := []byte{0,0,0,107,0,0,0,4,0,0,0,0,0,5,196,163,79,77,86,52,0,3,1,56,48,51,54,50,0,1,1,56,49,50,51,52,53,48,48,49,48,48,48,0,0,0,0,0,49,56,48,49,48,53,49,50,48,48,48,48,48,48,52,43,0,1,0,0,0,37,82,101,112,108,121,32,89,101,115,32,116,111,32,111,112,116,32,105,110,32,111,114,32,78,111,32,116,111,32,111,112,116,32,111,117,116,46}
+	expected := []byte{0, 0, 0, 107, 0, 0, 0, 4, 0, 0, 0, 0, 0, 5, 196, 163, 79, 77, 86, 52, 0, 3, 1, 56, 48, 51, 54, 50, 0, 1, 1, 56, 49, 50, 51, 52, 53, 48, 48, 49, 48, 48, 48, 0, 0, 0, 0, 0, 49, 56, 48, 49, 48, 53, 49, 50, 48, 48, 48, 48, 48, 48, 52, 43, 0, 1, 0, 1, 0, 37, 82, 101, 112, 108, 121, 32, 89, 101, 115, 32, 116, 111, 32, 111, 112, 116, 32, 105, 110, 32, 111, 114, 32, 78, 111, 32, 116, 111, 32, 111, 112, 116, 32, 111, 117, 116, 46}
 	if !bytes.Equal(buf.Bytes(), expected) {
 		t.Fatalf("expected %v, got %v", expected, buf.Bytes())
 	}
 }
 
-// func TestRealScenario(t *testing.T) {
+func TestEncodeFunctionCorrectlyEncodesAllFieldsGSM7Message(t *testing.T) {
-//
+	p := &SUBMIT_SM{
-// 	p.header.command_length = uint32(p.Size())
+		Header: &PDU_HEADER{
-// 	p.sm_length = byte(len(p.short_message))
+			Command_length:  0,
-// 	buf := make([]byte, p.Size())
+			Command_id:      4,
-// 	err := p.EncodeInto(&buf)
+			Command_status:  0,
-// 	if err != nil {
+			Sequence_number: 378019,
-// 		t.Errorf("Expected no error, got %v", err)
+		},
-// 	}
+		Service_type:           "OMV4",
-// 	if len(buf) != len(expected) {
+		Source_addr_ton:        3,
-// 		t.Errorf("Expected byte slice of length %d, got %d", len(expected), len(buf))
+		Source_addr_npi:        1,
-// 	}
+		Source_addr:            "80362",
-// 	for i, v := range buf {
+		Dest_addr_ton:          1,
-// 		if v != expected[i] {
+		Dest_addr_npi:          1,
-// 			t.Errorf("Expected byte slice with values %v, got %v", expected, buf)
+		Destination_addr:       "812345001000",
-// 			break
+		Esm_class:              0,
-// 		}
+		Protocol_id:            0,
-// 	}
+		Priority_flag:          0,
-// }
+		Schedule_delivery_time: "",
+		Validity_period:        "180105120000004+",
+		Registered_delivery:    1,
+		Data_coding:            0, // The example uses 0 and claims to use GSM but the message is encoded as ASCII...
+		Sm_default_msg_id:      0,
+		Short_message:          "Reply Yes to opt in or No to opt out.",
+	}
+	p.UpdateSize()
+	buf := ByteBufferPool.Get(p.Size())
+	err := p.Encode(buf)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expected := []byte{0, 0, 0, 103, 0, 0, 0, 4, 0, 0, 0, 0, 0, 5, 196, 163, 79, 77, 86, 52, 0, 3, 1, 56, 48, 51, 54, 50, 0, 1, 1, 56, 49, 50, 51, 52, 53, 48, 48, 49, 48, 48, 48, 0, 0, 0, 0, 0, 49, 56, 48, 49, 48, 53, 49, 50, 48, 48, 48, 48, 48, 48, 52, 43, 0, 1, 0, 0, 0, 33, 210, 50, 156, 157, 7, 101, 203, 115, 16, 253, 13, 122, 195, 233, 160, 180, 27, 244, 150, 131, 156, 111, 16, 253, 13, 122, 195, 233, 160, 119, 157, 238, 2}
+	if !bytes.Equal(buf.Bytes(), expected) {
+		t.Fatalf("expected %v, got %v", expected, buf.Bytes())
+	}
+}
 
 // region decode
 
 // region size
 func TestCalculateSizeTypicalInstance(t *testing.T) {
 	p := &SUBMIT_SM{
-		service_type:           "test_service",
+		Service_type:           "test_service",
-		source_addr:            "12345",
+		Source_addr:            "12345",
-		destination_addr:       "67890",
+		Destination_addr:       "67890",
-		schedule_delivery_time: "",
+		Schedule_delivery_time: "",
-		validity_period:        "",
+		Validity_period:        "",
-		short_message:          "Hello, World!",
+		Short_message:          "Hello, World!",
+		Data_coding:            1,
 	}
-	expectedSize := 16 + len(p.service_type) + 1 + 1 + len(p.source_addr) + 1 + 1 + len(p.destination_addr) + 1 + 1 + 1 + len(p.schedule_delivery_time) + len(p.validity_period) + 1 + 1 + 1 + 1 + 1 + len(p.short_message)
+	expectedSize := 68
+	actualSize := p.Size()
+	if actualSize != expectedSize {
+		t.Errorf("Expected size %d, but got %d", expectedSize, actualSize)
+	}
+}
+
+func TestCalculateSizeTypicalGSM7Instance(t *testing.T) {
+	p := &SUBMIT_SM{
+		Service_type:           "test_service",
+		Source_addr:            "12345",
+		Destination_addr:       "67890",
+		Schedule_delivery_time: "",
+		Validity_period:        "",
+		Short_message:          "Hello, World!",
+		Data_coding:            0,
+	}
+	expectedSize := 67
 	actualSize := p.Size()
 	if actualSize != expectedSize {
 		t.Errorf("Expected size %d, but got %d", expectedSize, actualSize)
@@ -87,14 +123,15 @@ func TestCalculateSizeTypicalInstance(t *testing.T) {
 func TestCalculateSizeMaxLengths(t *testing.T) {
 	maxLen := 255
 	p := &SUBMIT_SM{
-		service_type:           string(make([]byte, maxLen)),
+		Service_type:           string(make([]byte, maxLen)),
-		source_addr:            string(make([]byte, maxLen)),
+		Source_addr:            string(make([]byte, maxLen)),
-		destination_addr:       string(make([]byte, maxLen)),
+		Destination_addr:       string(make([]byte, maxLen)),
-		schedule_delivery_time: string(make([]byte, maxLen)),
+		Schedule_delivery_time: string(make([]byte, maxLen)),
-		validity_period:        string(make([]byte, maxLen)),
+		Validity_period:        string(make([]byte, maxLen)),
-		short_message:          string(make([]byte, maxLen)),
+		Short_message:          string(make([]byte, maxLen)),
+		Data_coding:            1,
 	}
-	expectedSize := 16 + maxLen + 1 + 1 + maxLen + 1 + 1 + maxLen + 1 + 1 + 1 + maxLen + maxLen + 1 + 1 + 1 + 1 + 1 + maxLen
+	expectedSize := 1563
 	actualSize := p.Size()
 	if actualSize != expectedSize {
 		t.Errorf("Expected size %d, but got %d", expectedSize, actualSize)
@@ -103,14 +140,14 @@ func TestCalculateSizeMaxLengths(t *testing.T) {
 
 func TestHandlesEmptyStringsForAllStringFields(t *testing.T) {
 	p := &SUBMIT_SM{
-		service_type:           "",
+		Service_type:           "",
-		source_addr:            "",
+		Source_addr:            "",
-		destination_addr:       "",
+		Destination_addr:       "",
-		schedule_delivery_time: "",
+		Schedule_delivery_time: "",
-		validity_period:        "",
+		Validity_period:        "",
-		short_message:          "",
+		Short_message:          "",
 	}
-	expectedSize := 16 + len(p.service_type) + 1 + 1 + len(p.source_addr) + 1 + 1 + len(p.destination_addr) + 1 + 1 + 1 + len(p.schedule_delivery_time) + len(p.validity_period) + 1 + 1 + 1 + 1 + 1 + len(p.short_message)
+	expectedSize := 33
 	actualSize := p.Size()
 	if actualSize != expectedSize {
 		t.Errorf("Expected size %d, but got %d", expectedSize, actualSize)

server/server.go

@@ -1 +1,66 @@
-package server
+package server
+
+import (
+	"fmt"
+	"log"
+	"net"
+)
+
+type SMPPServer struct {
+	Id int
+	conns []*net.Conn
+	listener net.Listener
+	port  string
+	log log.Logger
+}
+
+func NewSMPPServer(port string, id int) *SMPPServer {
+	server := &SMPPServer{
+		port: port,
+		log: log.Logger{},
+		Id: id,
+	}
+	server.log = *log.New(log.Writer(), "", log.LstdFlags)
+	server.log.SetPrefix(fmt.Sprintf("SMPP server %d: ", server.Id))
+	return server
+}
+
+func (s *SMPPServer) Listen() error {
+	listener, err := net.Listen("tcp", s.port)
+	if err != nil {
+		return fmt.Errorf("failed to start SMPP server: %w", err)
+	}
+	// s.log.Printf("SMPP server %d started on %s", s.port)
+	s.listener = listener
+	return nil
+}
+
+// package main
+
+// import (
+// 	"net"
+// 	"fmt"
+// )
+
+// func main() {
+// 	ln, err := net.Listen("tcp", ":8080")
+// 	if err != nil {
+// 		fmt.Println(err)
+// 		return
+// 	}
+// 	defer ln.Close()
+
+// 	for {
+// 		conn, err := ln.Accept()
+// 		if err != nil {
+// 			fmt.Println(err)
+// 			continue
+// 		}
+// 		go handleConnection(conn)
+// 	}
+// }
+
+// func handleConnection(conn net.Conn) {
+// 	defer conn.Close()
+// 	// Handle the connection
+// }

utils/reactivevalue.go

@@ -0,0 +1,36 @@
+package utils
+
+type ReactiveValue[T any] struct {
+	V       T
+	subscribers []chan *T
+}
+
+func NewReactiveValue[T any](value T) *ReactiveValue[T] {
+	return &ReactiveValue[T]{
+		V:       value,
+		subscribers: make([]chan *T, 0),
+	}
+}
+
+func (rv *ReactiveValue[T]) Set(value T) {
+	rv.V = value
+	for _, subscriber := range rv.subscribers {
+		subscriber <- &value
+	}
+}
+
+func (rv *ReactiveValue[T]) Subscribe() chan *T {
+	subscriber := make(chan *T)
+	rv.subscribers = append(rv.subscribers, subscriber)
+	return subscriber
+}
+
+func (rv *ReactiveValue[T]) Unsubscribe(subscriber chan *T) {
+	for i, s := range rv.subscribers {
+		if s == subscriber {
+			rv.subscribers = append(rv.subscribers[:i], rv.subscribers[i+1:]...)
+			close(subscriber)
+			return
+		}
+	}
+}