I'm using a workflow where I end up in a view controller with a 'connect' and 'disconnect' button.

I can always connect/disconnect on the first attempt, however, subsequent attempts never connect. I need to go back to my listview, in order to re-scan for peripherals - and then try to connect again later when the peripheral has been re-discovered.

What could be going on?

Thanks! -SJ

When I run the code only thing outputted is this: 2015-09-01 11:44:22.415 LGBluetoothExample[6344:762493] Connection with error - (null) 2015-09-01 11:44:22.714 LGBluetoothExample[6344:762493] Service discovered - FFE0

Is there something I'm missing? Could do with a bit of insight on this.

Hi,

Thanks for your project!

During my usage, I've improved some details, and I've been using my version for more than 3 months, it's very stable now.

Best regards,

As the question asks, how can we scan indefinitely, and get a callback on each advertisement?

The scanWithPeripherals() call doesn't have any callbacks on device discovery. Also, I can't see any way to otherwise get some advertisement discovery information (other to maybe put a KVO on the peripherals variable?)

Changed deprecated iOS8 RSSI CoreBluetooth call.

peripheral.RSSI and peripheralDidUpdateRSSI were deprecated in iOS8 - now need to use the didReadRSSI API.

after Restart Bluetooth for several times,app crashed at [self.cbCharacteristic.service.peripheral writeValue:data forCharacteristic:self.cbCharacteristic type:type]; it seems that "self.cbCharacteristic.service" exist,but the "self.cbCharacteristic.service.peripheral" lost.so it crashed.

i tried to read temperature from foramed devices with command 0x26 i can pairing and read info (name ,version , manufacturer) but i cann't write command 0x26 to read result

// Scaning 4 seconds for peripherals [[LGCentralManager sharedInstance] scanForPeripheralsByInterval:10 completion:^(NSArray *peripherals) { // If we found any peripherals sending to test for (LGPeripheral *per in peripherals) { if ([per.UUIDString isEqualToString:@"2FF2DAFC-D4D5-4929-8E80-4CA23C56EEF2"]) {

         const uint16_t bytes[] = {0x26};
         NSData *data = [NSData dataWithBytes:bytes length:sizeof(bytes)];
            
             [LGUtils writeData:data
                    charactUUID:@"00001524-1212-efde-1523-785feabcd123"
                    serviceUUID:@"00001523-1212-efde-1523-785feabcd123"
                     peripheral:per completion:^(NSError *error) {
                         NSLog(@"Error : %@", error);
                         
                         [LGUtils readDataFromCharactUUID:@"00001524-1212-efde-1523-785feabcd123"
                                              serviceUUID:@"00001523-1212-efde-1523-785feabcd123"
                                               peripheral:per
                                               completion:^(NSData *data, NSError *error) {
                                                   NSLog(@"Data : %s Error : %@", (char *)[data bytes], error);
                                               }];
                     }];
         
             
     }
         NSLog(@"name:%@ UUID:%@",per.name,per.UUIDString);
     }
     
     

 }];

I'm having some problems while writing data

>       Byte bytes[] = {0x00, 0x01, 0x04, 0xd2};
>       NSData *data = [[NSData alloc] initWithBytes:bytes length:sizeof(bytes)];  // Funziona
> 
>       
>       [LGUtils writeData:data
>              charactUUID:@"01080000-0000-55f8-0840-5404a6b91b26"
>              serviceUUID:@"01000000-0000-55f8-0840-5404a6b91b26"
>               peripheral:peripheral completion:^(NSError *error) {
>                 [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
>                 NSLog(@"Scrittura dati - %@ %d Error : %@", data, data.length, error);
>                 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
>                   [LGUtils readDataFromCharactUUID:@"01080000-0000-55f8-0840-5404a6b91b26"
>                                        serviceUUID:@"01000000-0000-55f8-0840-5404a6b91b26"
>                                         peripheral:peripheral
>                                         completion:^(NSData *data, NSError *error) {
>                                           NSLog(@"%@ Data lenght %d : Error : %@", data, data.length, error);
>                                         }];
>                 });
>               }];

When I read the data I get the same value I wrote, instead the expected response from the device (in this case 0x000100000000)

I make a test with DarkBlue, an app from GitHub, which use the standard bluetooth library, and this code works:

  Byte bytes[] = {0x00, 0x01, 0x04, 0xd2};
  NSData *wrData = [[NSData alloc] initWithBytes:bytes length:sizeof(bytes)];  // Funziona

  NSLog(@"DEBUG ... %@", wrData);

  [self.peripheral writeValue:wrData forCharacteristic:self.defaultBTServer.selectCharacteristic type:CBCharacteristicWriteWithResponse];
  [self readAction];

The readAction method is a call to readValue, and the response from the device is as expected. Can you help me to figure out what is wrong with my code ?

When I set a notification on the Peripheral's characteristic manually, after being called once (working), I then perform some operations using LGUtils as a utility method to ensure that all services/characteristics are discovered, and that I'm connected - however, this wipes out my notification value next time around.