import Foundation

/// BLE 协议帧结构
/// 格式: [head:1][type:1][subpageTotal:2][curPage:2][dataLen:2][data:N][checksum:1]
public struct ProtocolFrame: Sendable {
    /// 传输方向标识 (0xC7 = APP→Device, 0xB0 = Device→APP)
    public let head: UInt8
    /// 命令类型，对应 CommandType
    public let type: UInt8
    /// 总分包数 (0 = 单帧不分包)
    public let subpageTotal: UInt16
    /// 当前包序号 (从 total-1 倒数到 0)
    public let curPage: UInt16
    /// 数据段字节长度
    public let dataLen: UInt16
    /// 数据段内容
    public let data: Data
    /// 校验字节
    public let checksum: UInt8
}