从RSSI蓝牙低功耗（BLE）标签？ [英] RSSI from Bluetooth Low Energy (BLE) Tags?

问题描述

我正在写一个应用程序（在Android）从蓝牙设备中读取RSSI，使用RSSI指纹位置辨识。我有工作code从不在BT4.0 / BLE非成对和发现的蓝牙设备读取RSSI。我想知道如果我得到一些基于BLE-标签（如棒-N-FIND）我就可以只把自己阅读他们的RSSI（我的Andr​​oid手机是precise），为BT-发现模式。

I'm writing an app (on android) to read RSSI from bluetooth devices, for location recognition using rssi fingerprinting. I have working code for reading RSSI from non-paired and discoverable bluetooth devices that are not BT4.0/BLE. I would like to know if I get some BLE-based tags (such as stick-n-find) would I be able to read their RSSI only by putting myself (my android phone to be precise), into bt-discovery mode.

推荐答案

在BT低能的角色转换。
棍子-N-FIND将广告它的服务（S）姓名或其他信息。当您从iOS应用接收广告，你会得到与广告的RSSI值。

In BT Low Energy the roles are switched. The Stick-n-find would be Advertising it's service(s) Name or other information. When you receive that Advertisement from your iOS APP you will get an RSSI value with that Advertisement.

所以才做这样的事情：

@property (strong, nonatomic) CBCentralManager *CM;

#define SERVICE_ID_STR     "4d1dc300-424d-13e2-a661-0002a55dc51b"

self.CM = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
NSDictionary *scanOptions = [NSDictionary dictionaryWithObject:[NSNumber
   numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
CBUUID *peripheralUUID = [CBUUID UUIDWithString:@SERVICE_ID_STR];
[self.CM scanForPeripheralsWithServices:[NSArray arrayWithObject:myUUID]
   options:scanOptions];

那么当它从周围听到的广告包您将获得

then when it hears the Advertisement package from a Peripheral you will get

- (void)centralManager:(CBCentralManager *)central 
    didDiscoverPeripheral:(CBPeripheral *)peripheral 
    advertisementData:(NSDictionary *)advertisementData
    RSSI:(NSNumber *)RSSI {

你在哪里得到的RSSI。

where you get the RSSI.

如果你只想要一个回调didDiscoverPeripheral的第一次外围的一声，然后不使用ScanOptions

If you only want a callback to didDiscoverPeripheral for the FIRST time the peripheral is heard then don't use the ScanOptions

[self.CM scanForPeripheralsWithServices:[NSArray arrayWithObject:myUUID] options:nil];

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