IOS藍芽連線和傳送資料
首先要確定藍芽是否開啟
本文使用的是 Objective-C語言
1.新建一個藍芽幫助類BlueHelp
並匯入
pragma mark - CBPeripheralDelegate
//只要掃描到服務就會呼叫,其中的外設就是服務所在的外設
- (void)peripheral:(CBPeripheral )peripheral didDiscoverServices:(NSError )error{
if (error){
NSLog(@”掃描服務出現錯誤,錯誤原因:%@”,error);
}else{
//獲取外設中所掃描到的服務
NSArray *services = peripheral.services;
for (CBService *service in services){
//拿到需要掃描的服務,例如列印一些服務資料
//把所有的service打印出來
NSLog(@”service is :%@”,service);
//從需要的服務中查詢需要的特徵
//從peripheral的services中掃描特徵
[peripheral discoverCharacteristics:nil forService:service];
}
}
}
//只要掃描到特徵就會呼叫,其中的外設和服務就是特徵所在的外設和服務
- (void)peripheral:(CBPeripheral )peripheral didDiscoverCharacteristicsForService:(CBService )service error:(NSError *)error{
if (error){
NSLog(@”掃描特徵出現錯誤,錯誤原因:%@”,error);
}else{
//拿到服務中所有的特徵
NSArray *characteristics = service.characteristics;
//遍歷特徵,拿到需要的特徵進行處理
for (CBCharacteristic *characteristic in characteristics){
NSLog(@”所有的特徵為:%@”,characteristic.UUID.UUIDString);
//如果是溫度資料處理
if([characteristic.UUID.UUIDString isEqualToString:@”你自己的特徵值”]){
//將全部的特徵資訊打印出來
_peripheral = peripheral;
scperipheral = peripheral;
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
NSLog(@”%@”,characteristic);
}
//這裡是傳送 裝置設定藍芽傳送溫度資料的值
else if([characteristic.UUID.UUIDString isEqualToString:@”你自己的特徵值”]){
writecharacteristic = characteristic;
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
NSLog(@”寫入的值為:%@”,characteristic);
}
//如果是ota進行ota升級
else if([characteristic.UUID.UUIDString isEqualToString:@”你需要的特徵值”]){
_peripheral = peripheral;
scperipheral = peripheral;
writeOtacharacteristic = characteristic;
//設定通知
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
//NSLog(@”OTA升級了”);
isOTA = TRUE;
NSString *s = @”OTA”;
NSDictionary *tempOta = [NSDictionary dictionaryWithObject:s forKey:@”ota”];
[[NSNotificationCenter defaultCenter] postNotificationName:@”tempOTA” object:nil userInfo:tempOta];
}
//無鍵按鈕DFU
else if([characteristic.UUID.UUIDString isEqualToString:@”你自己需要的特徵值”]){
writeDfucharacteristic = characteristic;
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
NSLog(@”寫入的OTA值為:%@”,characteristic);
}
}
}
}
/*
* 獲取所有的溫度更新資料
* 接收藍芽傳送過來的溫度資料 並經過解析和轉換
*/
- (void)peripheral:(CBPeripheral )peripheral didUpdateValueForCharacteristic:(CBCharacteristic )characteristic error:(NSError *)error
{
if ([characteristic.UUID isEqual:BOOT_LOADER_CHARACTERISTIC_UUID])
{
uint8_t dataPointer = (uint8_t
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){ //把資料存入到資料庫
NSString *a = [_userDefaults objectForKey:@"tempUnit"];
//如果是華氏度的時候一定要把它轉為攝氏度之後再來儲存資料 以便資料的統一性
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);
}
//當讀取到資料的時候就要存入資料 以後用來藍芽自動的去連線
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];
}
}
上面這些程式碼可以不看 我寫的是一些資料的轉換
下面我們可以看下藍芽寫入資料
//也可以自定義主要是給外部呼叫
//傳送資料
-(void)writeBlueValue:(NSString *)value{
_isSendData = TRUE;
[self writeValue:value forCharacteristic:writecharacteristic];
}
/*
這個是給藍芽傳送資料用的
*/
-(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];
}
//傳送完成後 又要它歸位
_isSendData = FALSE;
NSLog(@"已經向外設%@的特徵值%@寫入資料",selectPeriperal.name,writecharacteristic.description);
}
一般傳送資料都需要用到 NSData資料型別格式下面我有幾個方法
/**
* Method to convert hex to byteArray。這裡是將16進位制轉換為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;
}
還有一種是
//字串轉為陣列
-(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;
}
這些方法比較常用的
好了基本思路就這樣 原始碼 過段時間放上來 。