From 2ea433f93e2293842485001079dbbdd9ac6ccc43 Mon Sep 17 00:00:00 2001
From: Michael Smith <m@smith.eu>
Date: Wed, 20 May 2026 11:17:17 +0200
Subject: [PATCH] Implement Frames

---
 agwpe.go      | 32 ------------------------
 frame.go      | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++
 frame_test.go | 13 ++++++++++
 3 files changed, 82 insertions(+), 32 deletions(-)
 create mode 100644 frame.go
 create mode 100644 frame_test.go

diff --git a/agwpe.go b/agwpe.go
index 0ac13ad..c573708 100644
--- a/agwpe.go
+++ b/agwpe.go
@@ -64,35 +64,3 @@ func (pe *PacketEngine) Disconnect() error {
 
 	return nil
 }
-
-// import "encoding/binary"
-
-// type Frame struct {
-// 	Port      byte
-// 	Reserved0 [3]byte
-// 	DataKind  byte
-// 	Reserved1 byte
-// 	PID       byte
-// 	Reserved2 byte
-// 	CallFrom  [10]byte
-// 	CallTo    [10]byte
-// 	DataLen   uint32
-// 	User      [4]byte
-// }
-
-// func (f *Frame) Serialize() []byte {
-// 	buf := make([]byte, 36)
-
-// 	buf[0] = f.Port
-// 	// Ignore reserved bytes 1 to 3
-// 	buf[4] = f.DataKind
-// 	// Ignore reserved byte 5
-// 	buf[6] = f.PID
-// 	// Ignore reserved byte 7
-// 	copy(buf[8:18], f.CallFrom[:])
-// 	copy(buf[18:28], f.CallTo[:])
-// 	binary.LittleEndian.PutUint32(buf[28:32], f.DataLen)
-// 	copy(buf[32:36], f.User[:])
-
-// 	return buf
-// }
diff --git a/frame.go b/frame.go
new file mode 100644
index 0000000..d13b392
--- /dev/null
+++ b/frame.go
@@ -0,0 +1,69 @@
+package agwpe
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+type Header struct {
+	Port      byte
+	Reserved0 [3]byte
+	DataKind  byte
+	Reserved1 byte
+	PID       byte
+	Reserved2 byte
+	CallFrom  [10]byte
+	CallTo    [10]byte
+	DataLen   uint32
+	User      [4]byte
+}
+
+func serializeHeader(h Header) []byte {
+	data := make([]byte, 36)
+
+	data[0] = h.Port
+	// Ignore reserved bytes 1 to 3
+	data[4] = h.DataKind
+	// Ignore reserved byte 5
+	data[6] = h.PID
+	// Ignore reserved byte 7
+	copy(data[8:18], h.CallFrom[:])
+	copy(data[18:28], h.CallTo[:])
+	binary.LittleEndian.PutUint32(data[28:32], h.DataLen)
+	copy(data[32:36], h.User[:])
+
+	return data
+}
+
+type Frame interface {
+	Header() Header
+}
+
+type VersionFrame struct {
+	header       Header
+	major, minor uint16
+}
+
+func NewVersionFrame() *VersionFrame {
+	return &VersionFrame{
+		header: Header{
+			Port:     0x01,
+			DataKind: 0x52},
+	}
+}
+
+func (f *VersionFrame) Header() Header {
+	return f.header
+}
+
+func (f *VersionFrame) Serialize() ([]byte, error) {
+	data := serializeHeader(f.header)
+
+	return data, nil
+}
+
+func (f *VersionFrame) parseVersion(data []byte) {
+	f.major = (uint16(data[37]) << 8) | uint16(data[36])
+	f.minor = (uint16(data[41]) << 8) | uint16(data[40])
+	fmt.Printf("AGWPE version: %d.%d\n", f.major, f.minor)
+}
diff --git a/frame_test.go b/frame_test.go
new file mode 100644
index 0000000..9470f90
--- /dev/null
+++ b/frame_test.go
@@ -0,0 +1,13 @@
+package agwpe
+
+import (
+	"testing"
+)
+
+func TestNewFrameHeader(t *testing.T) {
+
+}
+
+func TestFrameHeader_Serialize(t *testing.T) {
+
+}