83 lines
2.7 KiB
Go
83 lines
2.7 KiB
Go
package ble
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import (
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"device-ble/internal/interfaces"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"strings"
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"time"
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"github.com/google/uuid"
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)
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const (
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MTU = 247 // 蓝牙模块 MTU 限制为 64 字节
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Suffix = "\r\n" // AT 指令后缀 (2字节)
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HeaderSize = 4 // 分包头部：2 字节索引 + 2 字节总包数
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)
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var Prefix string = "AT+QBLEGATTSNTFY=0,fff2," // AT 指令前缀 (20字节）
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var MaxPayload int = MTU - len(Prefix) - len(Suffix) - HeaderSize // 实际载荷大小：247 - 20 - 2 - 4 = 221 字节
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// Packet 分包结构
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type Packet struct {
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Index uint16 // 分包索引
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Total uint16 // 总分包数
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Payload []byte // 数据载荷
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}
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// splitIntoPackets 将数据分包
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func splitIntoPackets(data []byte) []Packet {
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var packets []Packet
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totalPackets := (len(data) + MaxPayload - 1) / MaxPayload // 向上取整
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for i := 0; i < len(data); i += MaxPayload {
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end := i + MaxPayload
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if end > len(data) {
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end = len(data)
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}
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packet := Packet{
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Index: uint16(i / MaxPayload),
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Total: uint16(totalPackets),
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Payload: data[i:end],
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}
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packets = append(packets, packet)
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}
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return packets
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}
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// SendJSONOverBLE 发送 JSON 数据的主要函数。
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func SendJSONOverBLE(sq interfaces.SerialQueueInterface, jsonData interface{}) error {
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// 这里需要传入logger参数，建议后续重构接口
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// 目前先用fmt.Println模拟日志，后续可传入logger
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tag := uuid.New().String()
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dataBytes, err := json.Marshal(jsonData)
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if err != nil {
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return fmt.Errorf("JSON序列化失败: %v", err)
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}
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packets := splitIntoPackets(dataBytes)
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for _, packet := range packets {
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packetData := make([]byte, len(Prefix)+HeaderSize+len(packet.Payload)+len(Suffix))
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copy(packetData, Prefix)
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binary.BigEndian.PutUint16(packetData[len(Prefix):], packet.Index)
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binary.BigEndian.PutUint16(packetData[len(Prefix)+2:], packet.Total)
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copy(packetData[len(Prefix)+HeaderSize:], packet.Payload)
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copy(packetData[len(Prefix)+HeaderSize+len(packet.Payload):], Suffix)
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response, err := sq.SendCommand(packetData, 300*time.Millisecond, 1*time.Millisecond, 100*time.Millisecond)
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if strings.Contains(response, "OK") {
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fmt.Printf("⚡ 数据包： %v ⬇️ 子包： %d/%d 发送成功, size：%d bytes\n", tag, packet.Index+1, packet.Total, len(packetData))
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} else if strings.Contains(response, "ERROR") {
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fmt.Printf("⛔️ 数据包： %v ⬇️ 子包： %d/%d 发送失败\n", tag, packet.Index+1, packet.Total)
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return err
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} else {
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fmt.Printf("❗❓ 数据包： %v ⬇️ 子包： %d/%d 未知回显：%v, error：%v\n", tag, packet.Index+1, packet.Total, response, err)
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return err
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}
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}
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fmt.Printf("✅️ All packets of Packet %v sent and verified.\n", tag)
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return nil
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}
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