IOS Core Bluetooth : Writing NSData for Characteristic

Question

I am using the following code to write the 0xDE value for a Bluetooth Caracteristic (Reset Device) using the IOS Core Bluetooth :

...
NSData *bytes = [@\"0xDE\"          


        

Answer 1

What you are, in fact, doing here is writing the string "0xDE" to the characteristic. If you want to use binary/octal notation, you need to stay away from strings.

int integer = 0xDE;
NSData *data = [[NSData alloc] initWithBytes:&integer length:sizeof(integer)];
[peripheral writeValue:data
     forCharacteristic:characteristic
                  type:CBCharacteristicWriteWithResponse];