commit d9b33b0e0b8731b347d4463468b17ed35282377d
Author: suguo.yao <ysg@myschools.me>
Date:   Sun Oct 22 15:02:24 2023 +0800

    init

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..7445f5d
--- /dev/null
+++ b/main.go
@@ -0,0 +1,215 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type client struct {
+	Conn     net.Conn
+	Payload  string
+	DeviceID string
+	Plen     int    //包长度
+	ver      string //版本
+	step     bool   //计步开关
+	find     bool   //发现开关
+	phb      string //电话本
+	sms      string //短消息
+	cr       string //定位
+}
+
+func (m *client) unpack() {
+	str := strings.Split(m.Payload, "*")
+	m.DeviceID = str[1]
+	l, err := strconv.Atoi(str[2])
+	if err == nil {
+		m.Plen = l
+	}
+	m.Payload = strings.TrimRight(str[3], "]")
+}
+
+func (m *client) pack() string {
+	return fmt.Sprintf("[3G*%s*%04d*%s]", m.DeviceID, len(m.Payload), m.Payload)
+}
+
+var messageChan chan *client
+var platfromChan chan *client
+var devices map[string]*client
+
+func init() {
+	messageChan = make(chan *client)
+	platfromChan = make(chan *client)
+	devices = make(map[string]*client)
+}
+
+func main() {
+
+	go processPlatfrom()
+	go messageWrite()
+
+	listen, err := net.Listen("tcp", "0.0.0.0:8080")
+	if err != nil {
+		fmt.Println("Listen() failed, err: ", err)
+		return
+	}
+
+	for {
+		conn, err := listen.Accept()
+		if err != nil {
+			fmt.Println("Accept() failed, err: ", err)
+			continue
+		}
+
+		go processClient(conn)
+	}
+}
+
+func processClient(conn net.Conn) {
+	defer conn.Close()
+
+	for {
+		reader := bufio.NewReader(conn)
+		var buf [128]byte
+		n, err := reader.Read(buf[:])
+		if err != nil {
+			fmt.Println("read from client failed, err: ", err)
+			break
+		}
+
+		mess := &client{
+			Conn:    conn,
+			Payload: string(buf[:n]),
+		}
+
+		messageChan <- mess
+	}
+}
+
+func messageWrite() {
+	for {
+		select {
+		case msg := <-messageChan:
+			if processContent(msg) {
+				n, err := msg.Conn.Write([]byte(msg.pack()))
+				if err != nil {
+					fmt.Printf("%s[%s] reply write[%d]: %v\n", msg.DeviceID, msg.Conn.RemoteAddr(), n, err)
+					continue
+				}
+				fmt.Printf("%s[%s] reply write[%d]: %s\n", msg.DeviceID, msg.Conn.RemoteAddr(), n, msg.Payload)
+			}
+		case msg := <-platfromChan:
+			n, err := msg.Conn.Write([]byte(msg.pack()))
+			if err != nil {
+				fmt.Printf("%s[%s] platfrom write[%d]: %v\n", msg.DeviceID, msg.Conn.RemoteAddr(), n, err)
+				continue
+			}
+			fmt.Printf("%s[%s] platfrom write[%d]: %s\n", msg.DeviceID, msg.Conn.RemoteAddr(), n, msg.Payload)
+		}
+		time.Sleep(5 * time.Microsecond)
+	}
+}
+
+func processContent(c *client) bool {
+	reply := false
+	c.unpack()
+	fmt.Printf("%s[%s] read: %s\n", c.DeviceID, c.Conn.RemoteAddr().String(), c.Payload)
+
+	content := strings.Split(c.Payload, ",")
+
+	switch content[0] {
+	case "LK":
+		c.Payload = "LK"
+		reply = true
+	case "TKQ":
+	case "VERNO":
+		c.ver = content[1]
+	case "MESSAGE":
+		c.sms = "ok"
+	case "PEDO":
+		c.step = true
+	case "WALKTIME":
+		c.step = true
+	case "PHB":
+		c.phb = "ok"
+	case "CR":
+		c.cr = "ok"
+	}
+
+	devices[c.DeviceID] = c
+
+	return reply
+}
+
+func processPlatfrom() {
+	for {
+		for _, c := range devices {
+			if c.ver == "" {
+				platfromChan <- &client{
+					Conn:     c.Conn,
+					DeviceID: c.DeviceID,
+					Payload:  "VERNO",
+				}
+				continue
+			}
+
+			//定位
+			if c.cr == "" {
+				platfromChan <- &client{
+					Conn:     c.Conn,
+					DeviceID: c.DeviceID,
+					Payload:  "CRa",
+				}
+				continue
+			}
+
+			if c.sms == "" {
+				platfromChan <- &client{
+					Conn:     c.Conn,
+					DeviceID: c.DeviceID,
+					Payload:  "MESSAGE,597D003100320033",
+				}
+				continue
+			}
+
+			if c.phb == "" {
+				// n1 := strconv.QuoteToASCII("爸爸")
+				platfromChan <- &client{
+					Conn:     c.Conn,
+					DeviceID: c.DeviceID,
+					Payload:  "PHB,13967898042,a,13967898042,b,13967898042,c,13967898042,d,13967898042,e",
+				}
+				continue
+			}
+
+			//查找手表（通过）
+			if !c.find {
+				platfromChan <- &client{
+					Conn:     c.Conn,
+					DeviceID: c.DeviceID,
+					Payload:  "FIND",
+				}
+				continue
+			}
+
+			//计步通不过
+			if !c.step {
+				platfromChan <- &client{
+					Conn:     c.Conn,
+					DeviceID: c.DeviceID,
+					Payload:  "PEDO,1",
+				}
+				platfromChan <- &client{
+					Conn:     c.Conn,
+					DeviceID: c.DeviceID,
+					Payload:  "WALKTIME,00:00-23:59",
+				}
+				continue
+			}
+		}
+		time.Sleep(5 * time.Second)
+	}
+}