iOS bluetooth low energy not detecting peripherals -

my app won't detect peripherals. im using light blue simulate bluetooth low energy peripheral , app won't sense it. installed light blue on 2 devices make sure generating peripheral signal , is. suggestions? labels updating , nslog showing scanning starting.

thanks in advance.

#import <uikit/uikit.h>          #import <corebluetooth/corebluetooth.h>                @interface viewcontroller : uiviewcontroller          @property (weak, nonatomic) iboutlet uitextfield *navdestination;             @end            #import "viewcontroller.h"              @implementation viewcontroller          - (ibaction)connect:(id)sender {           }          - (ibaction)navdestination:(id)sender {              nsstring *destinationtext  = self.navdestination.text;           }           - (void)viewdidload {          }             - (void)viewwilldisappear:(bool)animated {               [super viewwilldisappear:animated];            }            - (void)didreceivememorywarning {              [super didreceivememorywarning];              // dispose of resources can recreated.          }         @end            #import <uikit/uikit.h>         #import "viewcontroller.h"         @interface bluetoothviewcontroller : uiviewcontroller          @property (strong, nonatomic) cbcentralmanager *centralmanager;          @property (strong, nonatomic) cbperipheral *discoveredperepheral;          @property (strong, nonatomic) nsmutabledata *data;          @property (strong, nonatomic) iboutlet uitextview *textview;         @property (weak, nonatomic) iboutlet uilabel *charlabel;          @property (weak, nonatomic) iboutlet uilabel *isconnected;          @property (weak, nonatomic) iboutlet uilabel *myperipherals;          @property (weak, nonatomic) iboutlet uilabel *alabel;            - (void)centralmanagerdidupdatestate:(cbcentralmanager *)central;          - (void)centralmanger:(cbcentralmanager *)central diddiscoverperipheral:     (cbperipheral *)peripheral advertisementdata:(nsdictionary *)advertisementdata rssi:(nsnumber *)rssi;  -(void)centralmanager:(cbcentralmanager *)central didfailtoconnectperipheral:(cbperipheral *)peripheral error:(nserror *)error;  -(void)cleanup;  -(void)centralmanager:(cbcentralmanager *)central didconnectperipheral:(cbperipheral *)peripheral;    -(void)peripheral:(cbperipheral *)peripheral diddiscoverservices:(nserror *)error;  -(void)peripheral:(cbperipheral *)peripheral diddiscovercharacteristicsforservice:(cbservice *)service error:(nserror *)error;  -(void)centralmanager:(cbcentralmanager *)central diddisconnectperipheral:(cbperipheral *)peripheral error:(nserror *)error;  -(void)peripheral:(cbperipheral *)peripheral didupdatevalueforcharacteristic:(cbcharacteristic *)characteristic error:(nserror *)error;  -(void)peripheral:(cbperipheral *)peripheral didupdatenotificationstateforcharacteristic:(cbcharacteristic *)characteristic error:(nserror *)error;      @end     @interface bluetoothviewcontroller ()  @end  @implementation bluetoothviewcontroller  - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil {     self = [super initwithnibname:nibnameornil bundle:nibbundleornil];     if (self) {         // custom initialization     }     return self; }  - (void)viewdidload {      _centralmanager = [[cbcentralmanager alloc]initwithdelegate:self queue:nil options:nil];      _data = [[nsmutabledata alloc]init];    }    - (void)viewwilldisappear:(bool)animated {      [super viewwilldisappear:animated];      [_centralmanager stopscan];  }    - (void)didreceivememorywarning {      [super didreceivememorywarning];      // dispose of resources can recreated.  }  - (void)centralmanagerdidupdatestate:(cbcentralmanager *)central {      //you should test scenarios      if (central.state == cbcentralmanagerstateunknown) {          self.alabel.text = @"i dont because state unknown.";          return;      }      if (central.state == cbcentralmanagerstatepoweredon) {          //scan devices          [_centralmanager scanforperipheralswithservices:nil options:@{ cbcentralmanagerscanoptionallowduplicateskey : @yes }];          nslog(@"scanning started");      }      if (central.state == cbcentralmanagerstateresetting) {          self.alabel.text = @"i dont because state resetting.";          return;      }      if (central.state == cbcentralmanagerstateunsupported) {          self.alabel.text = @"i dont because state unsupported.";          return;      }      if (central.state == cbcentralmanagerstateunauthorized) {          self.alabel.text = @"i dont because state unauthorized.";          return;      }      if (central.state == cbcentralmanagerstatepoweredoff) {          self.alabel.text = @"i dont because state powered off.";          return;      }          }  - (void)centralmanger:(cbcentralmanager *)central diddiscoverperipheral:(cbperipheral *)peripheral advertisementdata:(nsdictionary *)advertisementdata rssi:(nsnumber *)rssi {        nslog(@"discovered %@ @ %@", peripheral.name, rssi);      self.myperipherals.text = [nsstring stringwithformat:@"%@%@",peripheral.name, rssi];      if (_discoveredperepheral != peripheral) {          //save copy of peripheral          _discoveredperepheral = peripheral;          //and connect          nslog(@"connecting peripheral %@", peripheral);          [_centralmanager connectperipheral:peripheral options:nil];          self.alabel.text = [nsstring stringwithformat:@"%@", peripheral];      }  }  -(void)centralmanager:(cbcentralmanager *)central didfailtoconnectperipheral:(cbperipheral *)peripheral error:(nserror *)error {        nslog(@"failed connect");      [self cleanup];  }  -(void)cleanup {      //see if subscribed characteristic on peripheral      if (_discoveredperepheral.services != nil) {          (cbservice *service in _discoveredperepheral.services) {              if (service.characteristics != nil) {                  (cbcharacteristic *characteristic in service.characteristics) {                      if ([characteristic.uuid isequal:[cbuuid uuidwithstring:@"508eff8e-f541-57ef-bd82-b0b4ec504ca9"]]) {                          if (characteristic.isnotifying) {                              [_discoveredperepheral setnotifyvalue:no forcharacteristic:characteristic];                              return;                          }                      }                  }              }          }      }      [_centralmanager cancelperipheralconnection:_discoveredperepheral];  }  -(void)centralmanager:(cbcentralmanager *)central didconnectperipheral:(cbperipheral *)peripheral {      nslog(@"connected");        [_centralmanager stopscan];      nslog(@"scanning stopped");        self.isconnected.text = [nsstring stringwithformat:@"connected"];        [_data setlength:0];        peripheral.delegate = self;        [peripheral discoverservices:nil];  }  -(void)peripheral:(cbperipheral *)peripheral diddiscoverservices:(nserror *)error {      if (error) { [self cleanup];          return;      }      (cbservice *service in peripheral.services) {          [peripheral discovercharacteristics:nil forservice:service];      }      //discover other characteristics  }  -(void)peripheral:(cbperipheral *)peripheral diddiscovercharacteristicsforservice:(cbservice *)service error:(nserror *)error {     if (error) { [self cleanup];      return;  }      (cbcharacteristic *characteristic in service.characteristics) {                [peripheral setnotifyvalue:yes forcharacteristic:characteristic];        }  }  -(void)peripheral:(cbperipheral *)peripheral didupdatevalueforcharacteristic:(cbcharacteristic *)characteristic error:(nserror *)error {        if (error) { nslog(@"error");          return;      }      nsstring *stringfromdata = [[nsstring alloc]initwithdata:characteristic.value encoding:nsutf8stringencoding];      self.charlabel.text = [nsstring stringwithformat:@"%@", stringfromdata];      //have got need?        if ([stringfromdata isequaltostring:@"eom"]) {          [_textview settext:[[nsstring alloc]initwithdata:self.data encoding:nsutf8stringencoding]];            [peripheral setnotifyvalue:no forcharacteristic:characteristic];            [_centralmanager cancelperipheralconnection:peripheral];        }      }  -(void)peripheral:(cbperipheral *)peripheral didupdatenotificationstateforcharacteristic:(cbcharacteristic *)characteristic error:(nserror *)error {        if ([characteristic.uuid isequal:nil]) {          return;      }      if (characteristic.isnotifying) {          nslog(@"notification began on %@", characteristic);      }      else {          [_centralmanager cancelperipheralconnection:peripheral];      }  }  -(void)centralmanager:(cbcentralmanager *)central diddisconnectperipheral:(cbperipheral *)peripheral error:(nserror *)error {      _discoveredperepheral = nil;        self.isconnected.text = [nsstring stringwithformat:@"connecting..."];        [_centralmanager scanforperipheralswithservices:nil options:@{ cbcentralmanagerscanoptionallowduplicateskey : @yes}];    }    @end 

looks aren't declaring implement cbcentralmanagerdelegate protocol. change bluetoothviewcontroller interface add cbcentralmanagerdelegate.

@interface bluetoothviewcontroller () <cbcentralmanagerdelegate>