iOS從BLE設備讀取數據

我試圖從BLE設備讀取數據，但不斷收到權限錯誤。演示項目可以在這裏找到：https://github.com/sergiomtzlosa/CoreBluetooth-Demo（請記住 - 我的代碼有點不同於這個）。iOS從BLE設備讀取數據

連接和閱讀值沒有問題，但是有一些特性（這是必需的）會導致權限錯誤。

Console log: Update error!!! Characteristic: "Unknown (< fff4 >)" with error: "Reading is not permitted".

所以，當我訂閱或從特徵讀取數據時，它發出我每次NULL（可能的原因：沒有讀取權限）。

Console log: Characteristic: "Unknown (< fff4 >)" -> with value: (null)

下面是一個代碼段：

//Action on discovering services 
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error 
{ 

if (error) 
{ 
    NSLog(@"Discovered services for %@ with error: %@", peripheral.name, [error localizedDescription]); 
    return; 
} 
for (CBService *service in peripheral.services) { 

    NSLog(@"Discovereddddddddddd service %@", service.UUID); 
    [testPeripheral discoverCharacteristics:nil forService:service]; 
} 
NSLog(@"didDiscoverServicesEnd"); 
} 

//Action on discovered characteristics 
- (void)peripheral:(CBPeripheral *)peripheral 
didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error { 
NSLog(@"didDiscoverCharacteristicsForService!"); 
for (CBCharacteristic *characteristic in service.characteristics) { 
    NSLog(@"Discovered characteristic %@", characteristic.UUID); 
    NSLog(@"---------------------------------------------------"); 
    NSLog(@"Reading value for characteristic %@", characteristic.UUID); 
    [peripheral readValueForCharacteristic:characteristic]; 
    NSLog(@"+++++++++++++++++++++++++++++++++++++++++++++++++++"); 
    [peripheral setNotifyValue:YES forCharacteristic:characteristic]; 
    } 
} 

//Action on reading value 
- (void)peripheral:(CBPeripheral *)peripheral 
didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{ 
if (error){ 
    NSLog(@"Update error!!! Characteristic: %@ with error: %@", characteristic.UUID, [error localizedDescription]); 
    return; 
}else{ 
    NSData *data = characteristic.value; 
    NSString *str = [NSString stringWithUTF8String:[data bytes]]; 
    NSLog(@"Characteristic: %@ -> with value: %@", characteristic.UUID, str); 
} 
}

有什麼不對？無論如何要克服這個問題？

來源

2013-08-19 snns

你確定那些是可讀的特點呢？讓我們看看從外周側的特徵初始化代碼。 – allprog

該特徵似乎不允許閱讀。也許配對首先要做？ – Larme

它已經配對。我沒有外圍設備的驅動代碼，但仍然試圖去獲取它們。 – snns

外設是嵌入式設備還是它是另一個iOS設備。我已經看到外設的特性必須被明確配置爲具有讀取權限。僅僅因爲你發現了一個特徵並不意味着你可以閱讀它。

來源

2013-12-19 23:32:54 OneGuyInDc

您必須時初始化的CBCharacteristic

「特徵值權限表示所讀取值，寫和加密權限特徵的值來檢查，如果你要訪問的值權限，權限設置。

typedef enum { 
    CBAttributePermissionsReadable = 0x01, 
    CBAttributePermissionsWriteable = 0x02, 
    CBAttributePermissionsReadEncryptionRequired = 0x04, 
    CBAttributePermissionsWriteEncryptionRequired = 0x08, 
} CBAttributePermissions;"

https://developer.apple.com/library/ios/documentation/CoreBluetooth/Reference/CBMutableCharacteristic_Class/Reference/CBMutableCharacteristic.html

來源

2014-08-02 07:05:34

iOS從BLE設備讀取數據

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