问题描述
我有一个TI传感器标签作为外围设备，它以kCBAdvDataManufacturerData的形式广播BLE数据.我想从iOS中的这些数据中提取不同的值.
I have a TI sensor Tag as a peripheral that broadcasts BLE data in the form of kCBAdvDataManufacturerData. I would like to extract different values from this data in iOS.
我正在Swift中执行以下操作:
I am executing the following in Swift:
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber){
for (index, foundPeripheral) in peripherals.enumerated(){
if foundPeripheral.peripheral?.identifier == peripheral.identifier{
peripherals[index].lastRSSI = RSSI
print("AdvertisementData:\(advertisementData)")
return
}
}
let isConnectable = advertisementData["kCBAdvDataIsConnectable"] as! Bool
let displayPeripheral = DisplayPeripheral(peripheral: peripheral, lastRSSI: RSSI, isConnectable: isConnectable)
peripherals.append(displayPeripheral)
tableView.reloadData()
}
}
这就是我在控制台中看到的:
And this is what I see in the console:
AdvertisementData:["kCBAdvDataIsConnectable":0，"kCBAdvDataManufacturerData":< 0d00fe05 0c6f32>，"kCBAdvDataLocalName":CLIMBC]
AdvertisementData:["kCBAdvDataIsConnectable": 0, "kCBAdvDataManufacturerData": <0d00fe05 0c6f32>, "kCBAdvDataLocalName": CLIMBC]
我要解码的数据是kCBAdvDataManufacturerData:< 0d00fe05 0c6f32>，并在屏幕上显示每个字段.具体来说，这就是我所代表的数字:
The data that I am interested in decoding is kCBAdvDataManufacturerData : <0d00fe05 0c6f32> and displaying each field on the screen.Specifically, this is what the numbers represent in my case:
- 0d00-TI制造商ID
- fe-我提供的节点ID
- 05-节点的状态(保持不变的状态
- c6f-是传感器标签电池的电压
- 32-是BLE数据包计数器.
在Android中，我可以进行以下解码:
In Android I am able to decode as following:
private static String getNodeIdFromRawPacket(byte[] manufSpecField) {
if(manufSpecField != null && manufSpecField.length > 1) {
return String.format("%02X", manufSpecField[0]);
}else{
return null;
}
}
private static int getNodeBatteryVoltageFromRawPacket(byte[] manufSpecField){
if(manufSpecField != null && manufSpecField.length > 4) {
return (((((int) manufSpecField[manufSpecField.length - 3]) << 24) >>> 24) << 8) + ((((int) manufSpecField[manufSpecField.length - 2]) << 24) >>> 24);
}else{
return 0;
}
}
private byte[] extractManufacturerSpecificData(byte[] scanRecord, int manufacturer_id){
if(scanRecord != null) {
int ptr = 0;
while (ptr < scanRecord.length && scanRecord[ptr] != 0) {
int field_length = scanRecord[ptr];
if (scanRecord[ptr + 1] == (byte) (0xFF)) { //this is true when the manufacturer specific data field has been found
if (((scanRecord[ptr + 3] << 8) + scanRecord[ptr + 2]) == manufacturer_id) {
byte[] manufacturerSpecificData = new byte[field_length - 3];
System.arraycopy(scanRecord, ptr + 4, manufacturerSpecificData, 0, field_length - 3);
return manufacturerSpecificData;
}
}
ptr += (field_length + 1);
}
return null;
}else{
return null;
}
}
};
我到底该如何实现?我是Swift的新手，这就是为什么我遇到一些困难.任何代码段都将受到欢迎.
How exactly can I achieve this? I am new to Swift that is why I am finding some difficulties. Any code snippet will be most welcome.
推荐答案
看到控制台的输出， advertisementData ["kCBAdvDataManufacturerData"] 似乎是包含以下内容的 NSData 7个字节.您可以轻松地将其作为Swift Data 进行访问，并且 Data 中的每个字节都可以使用下标进行访问:
Seeing the output of your console, advertisementData["kCBAdvDataManufacturerData"] seems to be an NSData containing 7 bytes. You can easily access it as a Swift Data, and each byte in a Data can be accessed with subscript:
if let manufacturerData = advertisementData["kCBAdvDataManufacturerData"] as? Data {
assert(manufacturerData.count >= 7)
//0d00 - TI manufacturer ID
//Constructing 2-byte data as little endian (as TI's manufacturer ID is 000D)
let manufactureID = UInt16(manufacturerData[0]) + UInt16(manufacturerData[1]) << 8
print(String(format: "%04X", manufactureID)) //->000D
//fe - the node ID that I have given
let nodeID = manufacturerData[2]
print(String(format: "%02X", nodeID)) //->FE
//05 - state of the node (something that remains constant
let state = manufacturerData[3]
print(String(format: "%02X", state)) //->05
//c6f - is the sensor tag battery voltage
//Constructing 2-byte data as big endian (as shown in the Java code)
let batteryVoltage = UInt16(manufacturerData[4]) << 8 + UInt16(manufacturerData[5])
print(String(format: "%04X", batteryVoltage)) //->0C6F
//32- is the BLE packet counter.
let packetCounter = manufacturerData[6]
print(String(format: "%02X", packetCounter)) //->32
}
这篇关于在Swift上从kCBAdvDataManufacturerData提取数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！