记录用。
手机连蓝牙外设，读取信息，发送指令，监控蓝牙状态，数据实时更新（500毫秒一次）。
首先引入
#import<CoreBluetooth/CoreBluetooth.h>
代理<CBCentralManagerDelegate,CBPeripheralDelegate>
//中央管理者 -->管理设备的扫描 --连接
@property (nonatomic, strong) CBCentralManager *centralManager;
蓝牙一共6种状态，初始化CBCentralManager，系统会调用- (void)centralManagerDidUpdateState:(CBCentralManager *)central代理方法，根据central.state判断蓝牙状态
- (CBCentralManager *)centralManager
{
if (!_centralManager)
{
_centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}
return _centralManager;
}
// 状态更新时调用
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
switch (central.state) {
case CBManagerStateUnknown:{
NSLog(@"为知状态");
self.peripheralState = central.state;
}
break;
case CBManagerStateResetting:
{
NSLog(@"重置状态");
self.peripheralState = central.state;
}
break;
case CBManagerStateUnsupported:
{
NSLog(@"不支持的状态");
self.peripheralState = central.state;
}
break;
case CBManagerStateUnauthorized:
{
NSLog(@"未授权的状态");
self.peripheralState = central.state;
}
break;
case CBManagerStatePoweredOff:
{
NSLog(@"关闭状态");
self.peripheralState = central.state;
self.getBlueStateBlock(4, @"未开启蓝牙(自动)");
}
break;
case CBManagerStatePoweredOn:
{
NSLog(@"开启状态－可用状态");
self.peripheralState = central.state;
NSLog(@"%ld",(long)self.peripheralState);
[self.centralManager scanForPeripheralsWithServices:nil options:nil];
}
break;
default:
break;
}
}
注意看上面开启的状态，加入[self.centralManager scanForPeripheralsWithServices:nil options:nil];
这个会让手机开始扫描蓝牙外设。
然后进入代理方法- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral )peripheral advertisementData:(NSDictionary)advertisementData RSSI:(NSNumber *)RSSI
// [NSString stringWithFormat:@"发现蓝牙设备,设备名:%@",peripheral.name];
//iphone会不断扫描周边的蓝牙设备，在里面找到你的外设。
！！重点，尽量和你的硬件工程师连调！！
找到你的蓝牙外设之后，执行[self.centralManager connectPeripheral:peripheral options:nil];连接你的外设
根据（连接成功，失败）连接状态会走两个方法，先说成功的
连接成功进入----->
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
/**
连接成功
@param central 中心管理
@param peripheral 连接成功的设备
*/
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
// 设置设备的代理
peripheral.delegate = self;
// services:传入nil 代表扫描所有服务
[peripheral discoverServices:nil];
}
然后进入- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
/**
扫描到对应的特征
@param peripheral 设备
@param service 特征对应的服务
@param error 错误信息
*/
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
// 遍历所有的特征
for (CBCharacteristic *characteristic in service.characteristics)
{
NSLog(@"特征值:%@",characteristic.UUID.UUIDString);
NSLog(@"服务server:%@ 的特征:%@, 读写属性:%ld", service.UUID.UUIDString, characteristic, characteristic.properties);
//1.只读
if ([characteristic.UUID.UUIDString isEqualToString:@"根据协议上的说明放入可读特征字符串"])
{
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
}
//2.读写 发送指令就是写。而且无论读写都会进入一个代理方法，方法我会写在结尾
if ([characteristic.UUID.UUIDString isEqualToString:@"根据协议上的说明放入可读写特征字符串"])
{
//发送指令要根据协议是发送16进制data还是8进制（我是16进制，一样就直接复制，如果是8进制搜去吧）
NSString *signal = @"你要发送的指令";
//先转换成16进制字符串，然后转换成16进制data，我都写下面了，找一下
NSString *signalStr = [self convertStringToHexStr:signal];
NSData *signalData = [self stringToHexData:signalStr];
//这里又会执行代理方法mmp
[peripheral writeValue:signalData forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
}
}
}
//将NSString转换成十六进制的字符串则可使用如下方式:
- (NSString *)convertStringToHexStr:(NSString *)str {
if (!str || [str length] == 0) {
return @"";
}
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]];
[data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {
unsigned char *dataBytes = (unsigned char*)bytes;
for (NSInteger i = 0; i < byteRange.length; i++) {
NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
if ([hexStr length] == 2) {
[string appendString:hexStr];
} else {
[string appendFormat:@"0%@", hexStr];
}
}
}];
return string;
}
//将16进制的字符串转换成NSData
- (NSData *) stringToHexData:(NSString *)hexStr
{
int len = [hexStr length] / 2; // Target length
unsigned char *buf = malloc(len);
unsigned char *whole_byte = buf;
char byte_chars[3] = {'\0','\0','\0'};
int i;
for (i=0; i < [hexStr length] / 2; i++) {
byte_chars[0] = [hexStr characterAtIndex:i*2];
byte_chars[1] = [hexStr characterAtIndex:i*2+1];
*whole_byte = strtol(byte_chars, NULL, 16);
whole_byte++;
}
NSData *data = [NSData dataWithBytes:buf length:len];
free( buf );
return data;
}
//写入数据后的回调
//用于检测中心向外设写数据是否成功
- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error{
NSLog(@"peripheral.name=%@,peripheral.services=%@",peripheral.name,peripheral.services);
if (error) {
NSLog(@"%s, line = %d, erro = %@",__FUNCTION__,__LINE__,error.description);
}
}
/**
根据特征读到数据
@param peripheral 读取到数据对应的设备
@param characteristic 特征
@param error 错误信息
*/
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(nonnull CBCharacteristic *)characteristic error:(nullable NSError *)error
{
if ([characteristic.UUID.UUIDString isEqualToString:@“外设特征”])
{
if (characteristic.value != NULL) {
NSData *myD = characteristic.value;
Byte *bytes = (Byte *)[myD bytes];
//下面是Byte 转换为16进制。
NSString *hexStr=@"";
for(int i=0;i<[myD length];i++){
NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数
if([newHexStr length]==1)
hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
else
hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
}
char *myBuffer = (char *)malloc((int)[hexStr length] / 2 + 1);
bzero(myBuffer, [hexStr length] / 2 + 1);
for (int i = 0; i < [hexStr length] - 1; i += 2) {
unsigned int anInt;
NSString * hexCharStr = [hexStr substringWithRange:NSMakeRange(i, 2)];
NSScanner * scanner = [[NSScanner alloc] initWithString:hexCharStr];
[scanner scanHexInt:&anInt];
myBuffer[i / 2] = (char)anInt;
}
NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:4];
NSLog(@"从蓝牙接收到的数据，并转化为NSString=%@<---",unicodeString);
}
}
}
完。
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