IOS蓝牙连接和发送数据

首先要确定蓝牙是否打开

本文使用的是 Objective-C语言

1.新建一个蓝牙帮助类BlueHelp

并导入

pragma mark - CBPeripheralDelegate

//只要扫描到服务就会调用,其中的外设就是服务所在的外设

- (void)peripheral:(CBPeripheral )peripheral didDiscoverServices:(NSError )error{

if (error){

NSLog(@”扫描服务出现错误,错误原因:%@”,error);

}else{

//获取外设中所扫描到的服务

NSArray *services = peripheral.services;

for (CBService *service in services){

//拿到需要扫描的服务,例如打印一些服务数据

//把所有的service打印出来

NSLog(@”service is :%@”,service);

//从需要的服务中查找需要的特征

//从peripheral的services中扫描特征

[peripheral discoverCharacteristics:nil forService:service];

}

}

}

//只要扫描到特征就会调用,其中的外设和服务就是特征所在的外设和服务

- (void)peripheral:(CBPeripheral )peripheral didDiscoverCharacteristicsForService:(CBService )service error:(NSError *)error{

if (error){

NSLog(@”扫描特征出现错误,错误原因:%@”,error);

}else{

//拿到服务中所有的特征

NSArray *characteristics = service.characteristics;

//遍历特征,拿到需要的特征进行处理

for (CBCharacteristic *characteristic in characteristics){

NSLog(@”所有的特征为:%@”,characteristic.UUID.UUIDString);

//如果是温度数据处理

if([characteristic.UUID.UUIDString isEqualToString:@”你自己的特征值”]){

//将全部的特征信息打印出来

_peripheral = peripheral;

scperipheral = peripheral;

[peripheral setNotifyValue:YES forCharacteristic:characteristic];

NSLog(@”%@”,characteristic);

}

//这里是发送 设备设置蓝牙发送温度数据的值

else if([characteristic.UUID.UUIDString isEqualToString:@”你自己的特征值”]){

writecharacteristic = characteristic;

[peripheral setNotifyValue:YES forCharacteristic:characteristic];

NSLog(@”写入的值为:%@”,characteristic);

}

//如果是ota进行ota升级

else if([characteristic.UUID.UUIDString isEqualToString:@”你需要的特征值”]){

_peripheral = peripheral;

scperipheral = peripheral;

writeOtacharacteristic = characteristic;

//设置通知

[peripheral setNotifyValue:YES forCharacteristic:characteristic];

//NSLog(@”OTA升级了”);

isOTA = TRUE;

NSString *s = @”OTA”;

NSDictionary *tempOta = [NSDictionary dictionaryWithObject:s forKey:@”ota”];

[[NSNotificationCenter defaultCenter] postNotificationName:@”tempOTA” object:nil userInfo:tempOta];

}

//无键按钮DFU

else if([characteristic.UUID.UUIDString isEqualToString:@”你自己需要的特征值”]){

writeDfucharacteristic = characteristic;

[peripheral setNotifyValue:YES forCharacteristic:characteristic];

NSLog(@”写入的OTA值为:%@”,characteristic);

}

}

}

}

/*

* 获取所有的温度更新数据

* 接收蓝牙发送过来的温度数据 并经过解析和转换

*/

- (void)peripheral:(CBPeripheral )peripheral didUpdateValueForCharacteristic:(CBCharacteristic )characteristic error:(NSError *)error

{

if ([characteristic.UUID isEqual:BOOT_LOADER_CHARACTERISTIC_UUID])

{

uint8_t dataPointer = (uint8_t ) [characteristic.value bytes];

NSString *errorCode = [NSString stringWithFormat:@”0x%2x”,dataPointer[1]];

errorCode = [errorCode stringByReplacingOccurrencesOfString:@” ” withString:@”0”];

// Checking the error code from the response
if ([errorCode isEqualToString:SUCCESS]&&commandArray.count>0)
{
if ([[commandArray objectAtIndex:0] isEqual:@(ENTER_BOOTLOADER)])
{
[self getBootLoaderDataFromCharacteristic:characteristic];
}
else if ([[commandArray objectAtIndex:0] isEqual:@(GET_FLASH_SIZE)])
{
[self getFlashDataFromCharacteristic:characteristic];
}
else if ([[commandArray objectAtIndex:0] isEqual:@(SEND_DATA)])
{
_isWritePacketDataSuccess = YES;
[_userDefaults setBool:_isWritePacketDataSuccess forKey:@"WriteSuccess"];
}
else if ([[commandArray objectAtIndex:0] isEqual:@(PROGRAM_ROW)])
{
_isWritePacketDataSuccess = YES;
[_userDefaults setBool:_isWritePacketDataSuccess forKey:@"WriteSuccess"];
}

else if ([[commandArray objectAtIndex:0] isEqual:@(VERIFY_ROW)])
{
[self getRowCheckSumFromCharacteristic:characteristic];
}
else if([[commandArray objectAtIndex:0] isEqual:@(VERIFY_CHECKSUM)])
{
[self checkApplicationCheckSumFromCharacteristic:characteristic];
}

if (cbCharacteristicUpdationHandler != nil)
{
cbCharacteristicUpdationHandler(YES,[commandArray objectAtIndex:0],nil);
[commandArray removeObjectAtIndex:0];
}

}
else
{
if(commandArray.count>0){
if ([[commandArray objectAtIndex:0] isEqual:@(PROGRAM_ROW)])
{
_isWritePacketDataSuccess = NO;
}
else if ([[commandArray objectAtIndex:0] isEqual:@(SEND_DATA)])
{
_isWritePacketDataSuccess = NO;
}
if (cbCharacteristicUpdationHandler != nil)
{
cbCharacteristicUpdationHandler(YES,[commandArray objectAtIndex:0],nil);
[commandArray removeObjectAtIndex:0];
}
}
}
}
if(!isOTA&&!_isSendData){
NSString *temps=[self getTempData:characteristic];
NSArray *ss = [temps componentsSeparatedByString:@","];
NSString *tempWendu =ss[0];
NSString *tempSymbol = ss[1];

self.currentDate = [NSDate date];

NSString *dateString = [_dateformatter stringFromDate:self.currentDate];

NSLog(@" ==save is time=== :%@",dateString);

NSDate *logDate = [_dateformatter dateFromString:dateString];
long logTime= (long)[logDate timeIntervalSince1970];
if(temps!=nil&&![_bluename isEqualToString:@""]&&_bluename!=nil&&_bluename!=NULL){ //把数据存入到数据库
NSString *a = [_userDefaults objectForKey:@"tempUnit"];
//如果是华氏度的时候一定要把它转为摄氏度之后再来保存数据 以便数据的统一性
if([a isEqualToString:@"°F"]){
float floatString = [tempWendu floatValue];

float aa = [_normalUtil convertFahrenheitToCelcius:floatString];

NSString *ftempWendu =  [NSString stringWithFormat:@"%.1f",aa];
NSString *ftempSymbol = @"°C";

[_tempDao saveTempname:_bluename saveTempaddre:_blueaddre saveTempwenduname:ftempSymbol saveTempwendu:ftempWendu saveTemptime:logTime];
}else{

[_tempDao saveTempname:_bluename saveTempaddre:_blueaddre saveTempwenduname:tempSymbol saveTempwendu:tempWendu saveTemptime:logTime];
}

NSLog(@" ==save is success=== :%ld",logTime);
}

//当读取到数据的时候就要存入数据 以后用来蓝牙自动的去连接
if(_saveAutoOnce){
[_userDefaults setObject:_bluename forKey:@"autoBlueName"];
[_userDefaults setObject:_blueaddre forKey:@"autoBlueAddre"];
_saveAutoOnce = false;
}

NSString * tp = [temps stringByAppendingString:@","];

NSString * tempp = [tp stringByAppendingString:_blueaddre];

NSDictionary *tempDict = [NSDictionary dictionaryWithObject:tempp forKey:@"temp"];

[[NSNotificationCenter defaultCenter] postNotificationName:@"tempNofiction" object:nil userInfo:tempDict];
}

}

上面这些代码可以不看 我写的是一些数据的转换

下面我们可以看下蓝牙写入数据

//也可以自定义主要是给外部调用

//发送数据

-(void)writeBlueValue:(NSString *)value{

_isSendData = TRUE;

[self writeValue:value forCharacteristic:writecharacteristic];

}

/*

这个是给蓝牙发送数据用的

*/

-(void)writeValue:(NSString )value forCharacteristic:(CBCharacteristic )characteristic

{

// NSData *data = [value dataUsingEncoding:4];

NSData *data = [_normalUtil stringToBytes:value]；

NSLog(@”send data is：%@:characteristic:%@”,data,writecharacteristic);

//is no write bluetooth data

if(writecharacteristic.properties & CBCharacteristicPropertyWriteWithoutResponse)

{

//send phone on bluetooth data

[selectPeriperal writeValue:data forCharacteristic:writecharacteristic type:CBCharacteristicWriteWithoutResponse];

}else

{

[selectPeriperal writeValue:data forCharacteristic:writecharacteristic type:CBCharacteristicWriteWithResponse];

}
//发送完成后 又要它归位
_isSendData = FALSE;
NSLog(@"已经向外设%@的特征值%@写入数据",selectPeriperal.name,writecharacteristic.description);

}

一般发送数据都需要用到 NSData数据类型格式下面我有几个方法

/**

* Method to convert hex to byteArray。这里是将16进制转换为NSData

*/

-(NSMutableData )dataFromHexString:(NSString )string

{

NSMutableData *data = [NSMutableData new];

NSCharacterSet *hexSet = [[NSCharacterSet characterSetWithCharactersInString:@”0123456789ABCDEF “] invertedSet];

// Check whether the string is a valid hex string. Otherwise return empty data
if ([string rangeOfCharacterFromSet:hexSet].location == NSNotFound) {

string = [string lowercaseString];
unsigned char whole_byte;
char byte_chars[3] = {'\0','\0','\0'};
int i = 0;
int length = (int)string.length;

while (i < length-1)
{
char c = [string characterAtIndex:i++];

if (c < '0' || (c > '9' && c < 'a') || c > 'f')
continue;
byte_chars[0] = c;
byte_chars[1] = [string characterAtIndex:i++];
whole_byte = strtol(byte_chars, NULL, 16);
[data appendBytes:&whole_byte length:1];
}
}
return data;

}

还有一种是

//字符串转为数组

-(NSData )stringToBytes:(NSString )string{

int a = [string intValue];

NSData *aData = [string dataUsingEncoding: NSUTF8StringEncoding];

Byte testByte = (Byte )[aData bytes];

testByte[0] = (Byte)(a>>24&0xff);

testByte[1] = (Byte) (a>>16&0xff);

testByte[2] = (Byte)(a>>8&0xff);

testByte[3] = (Byte)(a&0xff);

NSData *adata = [[NSData alloc] initWithBytes:testByte length:4];

return adata;

}

这些方法比较常用的

好了基本思路就这样 源代码 过段时间放上来 。