蓝牙相关
作者:互联网
central(中心) 和 peripheral(外设)
iOS 设备既可以作为 central,也可以作为 peripheral,这主要取决于通信需求。
区分的方式即是这两个角色的重要特点:提供数据的是谁,谁就是 peripheral;需要数据的是谁,谁就是 central。就像是 client 和 server 之间的关系一样。
iOS 设备既可以作为 central,也可以作为 peripheral,这主要取决于通信需求。
区分的方式即是这两个角色的重要特点:提供数据的是谁,谁就是 peripheral;需要数据的是谁,谁就是 central。就像是 client 和 server 之间的关系一样。
在 BLE 中,最常见的就是广播。实际上,peripheral 在不停的发送广播,希望被 central 找到。广播的信息中包含它的名字等信息。central 的作用则是去 scan,找到需要连接的 peripheral,连接后便可进行通信了。
[[CBCentralManager alloc]
initWithDelegate:self queue:nil options:nil];
搜索当前可用的 peripheral
[myCentralManager scanForPeripheralsWithServices:nil options:nil]; - (void)centralManager:(CBCentralManager *)central [myCentralManager stopScan]; |
连接 peripheral
[myCentralManager connectPeripheral:peripheral options:nil]; - (void)centralManager:(CBCentralManager *)central |
搜索 peripheral 的 service
[peripheral discoverServices:nil];
- (void)peripheral:(CBPeripheral *)peripheral |
搜索 service 的 characteristic
[peripheral discoverCharacteristics:nil forService:interestingService];
- (void)peripheral:(CBPeripheral *)peripheral |
读取 characteristic 数据
1、
NSLog(@"Reading value for characteristic %@", interestingCharacteristic); 2、 - (void)peripheral:(CBPeripheral *)peripheral |
订阅 Characteristic 数据
[peripheral setNotifyValue:YES forCharacteristic:interestingCharacteristic]; - (void)peripheral:(CBPeripheral *)peripheral 当订阅成功以后,那数据便会实时的传回了,数据的回调依然和之前读取 characteristic 的回调相同(注意,不是订阅的那个回调)
|
向 characteristic 写数据
[peripheral writeValue:dataToWrite forCharacteristic:interestingCharacteristic type:CBCharacteristicWriteWithResponse];
- (void)peripheral:(CBPeripheral *)peripheral |
检查设备是否能作为 central
centralManagerDidUpdateState
typedef NS_ENUM(NSInteger, CBCentralManagerState) {
CBCentralManagerStateUnknown = 0,
CBCentralManagerStateResetting,
CBCentralManagerStateUnsupported,
CBCentralManagerStateUnauthorized,
CBCentralManagerStatePoweredOff,
CBCentralManagerStatePoweredOn,
};
检查 characteristic 访问权限
CBCharacteristic
的properties
typedef NS_OPTIONS(NSUInteger, CBCharacteristicProperties) {
CBCharacteristicPropertyBroadcast = 0x01,
CBCharacteristicPropertyRead = 0x02,
CBCharacteristicPropertyWriteWithoutResponse = 0x04,
CBCharacteristicPropertyWrite = 0x08,
CBCharacteristicPropertyNotify = 0x10,
CBCharacteristicPropertyIndicate = 0x20,
CBCharacteristicPropertyAuthenticatedSignedWrites = 0x40,
CBCharacteristicPropertyExtendedProperties = 0x80,
CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0) = 0x100,
CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0) = 0x200
};
多个权限可以通过|
和&
来判断是否支持,比如判断是否支持读或写:
BOOL isSupport = characteristic.properties & (CBCharacteristicPropertyRead | CBCharacteristicPropertyWrite)
写入后是否回调
[self.connectedPeripheral writeValue:data forCharacteristic:connectedCharacteristic type:CBCharacteristicWriteWithResponse];
typedef NS_ENUM(NSInteger, CBCharacteristicWriteType) { - (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
|
CBCharacteristicPropertyNotify
Notifications of the characteristic’s value are permitted, without a response from the central to indicate that the notification was received.
Available in iOS 5.0 and later.
CBCharacteristicPropertyIndicate
Indications of the characteristic’s value are permitted, with a response from the central to indicate that the indication was received.
-
● HFP using eSCO channel
-
● A2DP using ACL channel
标签:central,characteristic,peripheral,蓝牙,error,相关,CBPeripheral,void 来源: https://www.cnblogs.com/zlaizp/p/14250086.html