iOS iBeacon

01_CreateBeacon.m

_peripheralManager = [[CBPeripheralManager alloc]
                      initWithDelegate:self 
                                 queue:nil];

NSUUID *uuid = [[NSUUID alloc] 
                initWithUUIDString:@"12345678-AAAA-BBBB-CCCC-123456789ABC"];

_region = [[CLBeaconRegion alloc] 
           initWithProximityUUID:uuid
                            major:1
                            minor:1
                       identifier:@"com.example.beacon"];

02_AdvertiseBeaconInCallback.m

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral
{
    // Ignore anything but powered on
    if (peripheral.state != CBPeripheralManagerStatePoweredOn) {
        return;
    }

    NSDictionary *peripheralData = [_region peripheralDataWithMeasuredPower:nil];

    [_peripheralManager startAdvertising:peripheralData];

}