From 87977ab7987693283c48be19c9b17446357406e1 Mon Sep 17 00:00:00 2001
From: jimZAH <james@colderwood.com>
Date: Sun, 21 Apr 2024 21:49:42 +0100
Subject: [PATCH] start of proto

---
 main.go            |  13 +++++
 proto/statshare.go |  55 +++++++++++++++++++
 proto/types.go     | 128 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 196 insertions(+)
 create mode 100644 main.go
 create mode 100644 proto/statshare.go
 create mode 100644 proto/types.go

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..13fdc06
--- /dev/null
+++ b/main.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/statsharev2/proto"
+)
+
+func main() {
+	client := proto.Init("1234567894321", 234)
+	raw := client.Connect()
+	fmt.Println(raw)
+}
diff --git a/proto/statshare.go b/proto/statshare.go
new file mode 100644
index 0000000..4e3c139
--- /dev/null
+++ b/proto/statshare.go
@@ -0,0 +1,55 @@
+package proto
+
+import (
+	"bytes"
+	"encoding/binary"
+	"log"
+	"strconv"
+)
+
+func Init(mpan string, clientID clientID) *Session {
+	n, err := strconv.ParseUint(mpan, 10, 64)
+	if err != nil {
+		log.Fatal("error with provided mpan")
+	}
+
+	session := new(Session)
+	session.Header.Version = VERSION
+	session.Header.ClientID = clientID
+	session.Mpan = n
+
+	return session
+}
+
+/* connecting to server */
+func (s *Session) Connect() []byte {
+	if s.State != NOT_CONNECTED {
+		return nil
+	}
+
+	s.Header.Flag = AUTH_REQUEST
+	s.Header.DataLen = 64
+
+	Request := Request{
+		Akey_0: s.Mpan,
+	}
+
+	buff := make([]byte, 0, 16)
+	buffer := bytes.NewBuffer(buff)
+	if err := binary.Write(buffer, binary.BigEndian, s.Header); err != nil {
+		log.Fatal(err)
+	}
+
+	if err := binary.Write(buffer, binary.BigEndian, Request); err != nil {
+		log.Fatal(err)
+	}
+
+	s.State = SENT_AUTH
+	return buffer.Bytes()
+}
+
+func (s *Session) SendData() {
+	if s.State != CONNECTED {
+		return
+	}
+}
diff --git a/proto/types.go b/proto/types.go
new file mode 100644
index 0000000..9557bff
--- /dev/null
+++ b/proto/types.go
@@ -0,0 +1,128 @@
+package proto
+
+type (
+	clientID uint16
+	flag     uint8
+	state    uint8
+	version  uint8
+)
+
+/*
+0 -   AUTH REQUEST
+1 -   AUTH RESPONSE
+2 -   CLIENT DATA
+254 - ACK
+255 - NAK
+*/
+const (
+	AUTH_REQUEST flag = iota
+	AUTH_RESPONSE
+	CLIENT_DATA
+	ACK flag = 254
+	NAK flag = 255
+)
+
+const (
+	NOT_CONNECTED state = iota
+	SENT_AUTH
+	AUTH_TOT
+	AUTHENTICATED
+	CONNECTED
+	SENT_DATA
+	RECEIVED_ACK
+	RECEIVED_NAK
+)
+
+const (
+	VERSION version = 1
+)
+
+/*
+===================================================
+| VERSION 1 byte | FLAG 1 byte | CLIENT ID 2 byte |
+===================================================
+|                   LEN OF DATA 4 bytes           |
+===================================================
+*/
+type Header struct {
+	Version  version
+	Flag     flag
+	ClientID clientID
+	DataLen  uint32
+}
+
+/*
+AUTH DATA (REQUEST)
+===================================================
+|               AUTH KEY 0 4 bytes                |
+===================================================
+*/
+
+type Request struct {
+	Akey_0 uint64
+}
+
+/*
+AUTH DATA (RESPONSE)
+===================================================
+|               CLIENT KEY 0 4 bytes              |
+===================================================
+===================================================
+|               CLIENT KEY 1 4 bytes              |
+===================================================
+===================================================
+|               CLIENT KEY 2 4 bytes              |
+===================================================
+===================================================
+|               CLIENT KEY 3 4 bytes              |
+===================================================
+*/
+type Response struct {
+	CKey_0 uint32
+	Ckey_1 uint32
+	Ckey_2 uint32
+	Ckey_3 uint32
+}
+
+/*
+CLIENT DATA
+===================================================
+|               CLIENT KEY 0 4 bytes              |
+===================================================
+===================================================
+|               CLIENT KEY 1 4 bytes              |
+===================================================
+===================================================
+|               CLIENT KEY 2 4 bytes              |
+===================================================
+===================================================
+|               CLIENT KEY 3 4 bytes              |
+===================================================
+===================================================
+|               NOW 4 bytes                       |
+===================================================
+===================================================
+|               DAY 4 bytes                       |
+===================================================
+===================================================
+|               EXPORT 4 bytes                    |
+===================================================
+===================================================
+|               GAS 4 bytes                       |
+===================================================
+*/
+type Energy struct {
+	CKey   Response
+	Now    float32
+	Day    float32
+	Export float32
+	Gas    float32
+}
+
+type Session struct {
+	CKey_p1 uint64
+	Ckey_p2 uint64
+	Header  Header
+	Mpan    uint64
+	State   state
+}