#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>
 
...
 
- (NSString *)getMacAddress
{
  int                 mgmtInfoBase[6];
  char                *msgBuffer = NULL;
  size_t              length;
  unsigned char       macAddress[6];
  struct if_msghdr    *interfaceMsgStruct;
  struct sockaddr_dl  *socketStruct;
  NSString            *errorFlag = NULL;
 
  // Setup the management Information Base (mib)
  mgmtInfoBase[0] = CTL_NET;        // Request network subsystem
  mgmtInfoBase[1] = AF_ROUTE;       // Routing table info
  mgmtInfoBase[2] = 0;              
  mgmtInfoBase[3] = AF_LINK;        // Request link layer information
  mgmtInfoBase[4] = NET_RT_IFLIST;  // Request all configured interfaces
 
  // With all configured interfaces requested, get handle index
  if ((mgmtInfoBase[5] = if_nametoindex("en0")) == 0) 
    errorFlag = @"if_nametoindex failure";
  else
  {
    // Get the size of the data available (store in len)
    if (sysctl(mgmtInfoBase, 6, NULL, &length, NULL, 0) < 0) 
      errorFlag = @"sysctl mgmtInfoBase failure";
    else
    {
      // Alloc memory based on above call
      if ((msgBuffer = malloc(length)) == NULL)
        errorFlag = @"buffer allocation failure";
      else
      {
        // Get system information, store in buffer
        if (sysctl(mgmtInfoBase, 6, msgBuffer, &length, NULL, 0) < 0)
          errorFlag = @"sysctl msgBuffer failure";
      }
    }
  }
 
  // Befor going any further...
  if (errorFlag != NULL)
  {
    NSLog(@"Error: %@", errorFlag);
    return errorFlag;
  }
 
  // Map msgbuffer to interface message structure
  interfaceMsgStruct = (struct if_msghdr *) msgBuffer;
 
  // Map to link-level socket structure
  socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1);
 
  // Copy link layer address data in socket structure to an array
  memcpy(&macAddress, socketStruct->sdl_data + socketStruct->sdl_nlen, 6);
 
  // Read from char array into a string object, into traditional Mac address format
  NSString *macAddressString = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X", 
                                macAddress[0], macAddress[1], macAddress[2], 
                                macAddress[3], macAddress[4], macAddress[5]];
  NSLog(@"Mac Address: %@", macAddressString);
 
  // Release the buffer memory
  free(msgBuffer);
 
  return macAddressString;
}

// Enabled monitoring of the sensor
[[UIDevice currentDevice] setProximityMonitoringEnabled:YES];
 
// Set up an observer for proximity changes
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(sensorStateChange:) 
	name:@"UIDeviceProximityStateDidChangeNotification" object:nil];

- (void)sensorStateChange:(NSNotificationCenter *)notification
{
  if ([[UIDevice currentDevice] proximityState] == YES)
    NSLog(@"Device is close to user.");
  else 
    NSLog(@"Device is ~not~ closer to user.");
}

[[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];
 
[[UIDevice currentDevice] batteryLevel];
[[UIDevice currentDevice] batteryState];

// Request to be notified when battery charge or state changes
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryStatus) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryStatus) name:UIDeviceBatteryStateDidChangeNotification object:nil];

- (void)loadView 
{
  [self setView:[[[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] autorelease]];
 
  // Setup the textview to display battery status
  textViewStatus = [[UITextView alloc] initWithFrame:CGRectMake	(20, 20, 280, 64)];
  [textViewStatus setFont:[UIFont boldSystemFontOfSize:18.0]];
  [textViewStatus setEditable:NO];
  [textViewStatus setTextAlignment:UITextAlignmentCenter];
  [[self view] addSubview:textViewStatus];
 
  // Round the corners and set border color  
  [textViewStatus setBackgroundColor:[UIColor whiteColor]];
  [[textViewStatus layer] setBorderColor:[[UIColor blueColor] CGColor]];
  [[textViewStatus layer] setBorderWidth:2.3];
  [[textViewStatus layer] setCornerRadius:15];
  [textViewStatus setClipsToBounds: YES];
 
  // Enable monitoring of battery status
  [[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];
 
  // Print current status
  [self batteryStatus];
 
  // Request to be notified when battery charge or state changes
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryStatus) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
 
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryStatus) name:UIDeviceBatteryStateDidChangeNotification object:nil];
 
}

- (void)batteryStatus
{
 NSArray *batteryStatus = [NSArray arrayWithObjects: 
    @"Battery status is unknown.", 
    @"Battery is in use (discharging).", 
    @"Battery is charging.", 
    @"Battery is fully charged.", nil];
 
  if ([[UIDevice currentDevice] batteryState] == UIDeviceBatteryStateUnknown)
  {
    [textViewStatus setText:[batteryStatus objectAtIndex:0]];  
    NSLog(@"%@", [batteryStatus objectAtIndex:0]);
  }
  else
  {  	
    NSString *msg = [NSString stringWithFormat:
      @"Battery charge level: %0.2f%%\n%@", [[UIDevice currentDevice] batteryLevel] * 100,
    [batteryStatus objectAtIndex:[[UIDevice currentDevice] batteryState]] ];
 
    [textViewStatus setText:msg];  
    NSLog(@"%@", msg);
  }
}

NSLog(@"uniqueIdentifier: %@", [[UIDevice currentDevice] uniqueIdentifier]);
NSLog(@"name: %@", [[UIDevice currentDevice] name]);
NSLog(@"systemName: %@", [[UIDevice currentDevice] systemName]);
NSLog(@"systemVersion: %@", [[UIDevice currentDevice] systemVersion]);
NSLog(@"model: %@", [[UIDevice currentDevice] model]);
NSLog(@"localizedModel: %@", [[UIDevice currentDevice] localizedModel]);

@interface UIDevice(machine)
- (NSString *)machine;
@end

sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen);

#import "UIDevice+machine.h"
#include <sys/types.h>
#include <sys/sysctl.h>
 
@implementation UIDevice(machine)
 
- (NSString *)machine
{
  size_t size;
 
  // Set 'oldp' parameter to NULL to get the size of the data
  // returned so we can allocate appropriate amount of space
  sysctlbyname("hw.machine", NULL, &size, NULL, 0); 
 
  // Allocate the space to store name
  char *name = malloc(size);
 
  // Get the platform name
  sysctlbyname("hw.machine", name, &size, NULL, 0);
 
  // Place name into a string
  NSString *machine = [NSString stringWithCString:name];
 
  // Done with this
  free(name);
 
  return machine;
}
 
@end

#import "UIDevice+machine.h"
 
...
 
NSLog(@"device: %@", [[UIDevice currentDevice] machine]);

NSString *deviceType = [UIDevice currentDevice].model;

NSString *deviceType = [UIDevice currentDevice].modellocalizedModel;
NSLog(@"type: %@", deviceType);

float version = 1.1;
...
NSString *deviceType = [UIDevice currentDevice].model;
NSLog(@"Your %@ has version %2.1f of Today's Horoscope installed.", 
    deviceType, version);