iOS Tutorial => Configure Beacons with CoreBluetooth

Introduction

Hot to read and write data to a bluetooth low energy device.

Remarks

Some important points

No capabilities are needed.
iPhone store bytes in Little Endian format, so check if bluetooth accessory use Little Endian too. Example:
- intel CPU usually use little endian.
- The ARM architecture was little-endian before version 3 when it became big-endian.
After a single or batch operation the connection will be lost, so you have to reconnect before continue.

Scan for SERVICE UUID

func SearchBLE(){
    cb_manager.scanForPeripherals(withServices:[service_uuid], options: nil)
    StopSearchBLE()
}

How to discover SERVICE UUID without documentation

func centralManager(_ central: CBCentralManager, didConnect peripheral:             
CBPeripheral) {
        peripheral.delegate = self
        peripheral.discoverServices(nil)
}

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    for service in peripheral.services! {
        print("Service: \(service)\n error: \(error)")
    }
}

discoverServices(nil) - NIL means that all services will be returned, which is not a good option.( READ Remarks 3)
If you haven't found the SERVICE UUID run your code and looking for in console

I found have 3 services: Battery, Device information (Firmware) and FFF0
This uuid service isn't a standard one, a list with standards can find here
FFF0 is the SERVICE UUID in this case

Convert data to UInt16 and contrary

Add this extensions to your class

protocol DataConvertible {
    init?(data: Data)
    var data: Data { get }
}

extension DataConvertible {

    init?(data: Data) {
        guard data.count == MemoryLayout<Self>.size else { return nil }
        self = data.withUnsafeBytes { $0.pointee }
    }

    var data: Data {
        var value = self
        return Data(buffer: UnsafeBufferPointer(start: &value, count: 1))
    }
}
extension UInt16 : DataConvertible {
    init?(data: Data) {
        guard data.count == MemoryLayout<UInt16>.size else { return nil }
        self = data.withUnsafeBytes { $0.pointee }
    }
    var data: Data {
        var value = CFSwapInt16HostToBig(self)
        return Data(buffer: UnsafeBufferPointer(start: &value, count: 1))
    }
}

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iOS

Fastest Entity Framework Extensions

Introduction

Remarks

Some important points

Scan for SERVICE UUID

How to discover SERVICE UUID without documentation

Convert data to UInt16 and contrary

Got any iOS Question?

iOS

iOS Configure Beacons with CoreBluetooth

Fastest Entity Framework Extensions

Introduction

Remarks

Some important points

Scan for SERVICE UUID

How to discover SERVICE UUID without documentation

Convert data to UInt16 and contrary

Configure Beacons with CoreBluetooth Related Examples

Got any iOS Question?