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Matter蓝牙解析

article 2024/10/10 2:30:00

解析 Matter 蓝牙广播

定义需要解析的字段。

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

/// 蓝牙广播服务 ID
extern NSString * const MatterBLEAdvServiceID;

@interface MatterBLEAdv : NSObject
@property (nonatomic, assign) NSInteger opCode;
@property (nonatomic, assign) NSInteger advVersion;
@property (nonatomic, assign) NSInteger discriminator;
@property (nonatomic, assign) NSInteger vendorID;
@property (nonatomic, assign) NSInteger productID;

/// 从广播的 NSData 中解析信息。
+ (MatterBLEAdv * _Nullable)advInfoFromData:(NSData *)advertising;

@end

.m 文件

具体的解析方法, 按照协议规则解析。

#import "MatterBLEAdv.h"

NSString * const MatterBLEAdvServiceID = @"FFF6";

@implementation MatterBLEAdv

/// 从广播中解析相关数据。
+ (MatterBLEAdv *)advInfoFromData:(NSData *)advertising {
    if (advertising.length != 8) {
        return nil;
    }
    int opCode = 0;
    [advertising getBytes:&opCode range:NSMakeRange(0, 1)];
    
    int data1_2 = 0;
    [advertising getBytes:&data1_2 range:NSMakeRange(1, 2)];
    int advVersion = data1_2 & 0xf000; // bit 15-12
    int discriminator = data1_2 & 0x0fff; // bit 0-12
    
    int vendorID = 0; // 16进制：1345 十进制：4933
    [advertising getBytes:&vendorID range:NSMakeRange(3, 2)];
    int productID = 0; // 16进制：a001 十进制：40961
    [advertising getBytes:&productID range:NSMakeRange(5, 2)];
    
    MatterBLEAdv *adv = [[MatterBLEAdv alloc] init];
    adv.opCode = opCode;
    adv.advVersion = advVersion;
    adv.discriminator = discriminator;
    adv.vendo

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