iOS Bluetooth Low Energy Peripheral

01_PeripheralManager.m

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

02_PeripheralManagerDelegate.m

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral {
    if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
        // create service
        // start advertising
    }
}

04_SwitchCharacteristicAndDescriptor.m

_switchCharacteristic = [[CBMutableCharacteristic alloc]
	       initWithType:[CBUUID UUIDWithString:SWITCH_CHARACTERISTIC_UUID]
	       properties:CBCharacteristicPropertyWrite | CBCharacteristicPropertyRead
	       value:nil
	       permissions:CBAttributePermissionsWriteable | CBAttributePermissionsReadable];

descriptor = [[CBMutableDescriptor alloc]
              initWithType: [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString]
              value:@"Switch"];

_switchCharacteristic.descriptors = @[descriptor];

05_DimmerCharacteristicAndDescriptor.m

_dimmerCharacteristic = [[CBMutableCharacteristic alloc]
                         initWithType:[CBUUID UUIDWithString:DIMMER_CHARACTERISTIC_UUID]
                         properties: CBCharacteristicPropertyRead | CBCharacteristicPropertyWrite
                         value:nil
                         permissions:CBAttributePermissionsWriteable | CBAttributePermissionsReadable];

descriptor = [[CBMutableDescriptor alloc]
              initWithType: [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString]
              value:@"Dimmer"];
              
_dimmerCharacteristic.descriptors = @[descriptor];

06_Service.m

CBMutableService *service = [[CBMutableService alloc] 
                             initWithType:[CBUUID UUIDWithString:LED_SERVICE_UUID] 
                                  primary:YES];
                                  
service.characteristics = @[_switchCharacteristic, _dimmerCharacteristic];

[_peripheralManager addService:service];
[_peripheralManager startAdvertising:@{CBAdvertisementDataServiceUUIDsKey : @[service.UUID]}];

07_WriteRequest.m

-(void)peripheralManager:(CBPeripheralManager *)peripheral 
 didReceiveWriteRequests:(NSArray *)requests
{
    NSLog(@"Received %lu write request(s)", (unsigned long)[requests count]);

    CBATTRequest *request = [requests firstObject];
    if ([request.characteristic.UUID isEqual:_switchCharacteristic.UUID]) {
        // ...
    } else if ([request.characteristic.UUID isEqual:_dimmerCharacteristic.UUID]) {
        // ...
    }

    [_peripheralManager respondToRequest:request withResult:CBATTErrorSuccess];
}

08_ReadRequest.m

-(void)peripheralManager:(CBPeripheralManager *)peripheral 
   didReceiveReadRequest:(CBATTRequest *)request 
{
    NSLog(@"Received read request for %@", [request characteristic]);

    if ([request.characteristic.UUID isEqual:_switchCharacteristic.UUID]) {
        request.value = _switchCharacteristic.value
    } 
    [_peripheralManager respondToRequest:request withResult:CBATTErrorSuccess];
}

Hi don, very good gist =] I have a question: Do you know how can I create multiple instances of the same characteristic (for example, Automation IO characteristics)? I've put this question in StackOverflow (http://stackoverflow.com/questions/33546272/how-to-create-multiple-instances-of-the-same-cbcharacteristic)