IOS bluetooth: Unknown error while writing to characteristic
In my application, I find my peripheral with the given service. Then I check that all the required stats are present before moving on.
When I write a value for my characteristics that didWriteValueForCharacteristic:
invokes the callback trigger:
- (void) peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
NSLog(@"Did write characteristic value : %@ with ID %@", characteristic.value, characteristic.UUID);
NSLog(@"With error: %@", [error localizedDescription]);
}
and outputs this result:
Did write characteristic value : <005c> with ID Unknown (<00005004 1212efde 1523785f eabcd123>)
With error: Unknown error.
The value is correct, the same applies to the 128 bit UUID of the characteristic, but in my peripherals I never get the written value.
Any suggestions on what might be wrong?
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I originally posted a WriteWithoutResponse
, changing that to WriteWithResponse
, gave it to me CoreBluetooth[WARNING] error 13
as @Larme mentioned in the comments. This value corresponds to Invalid attribute length value, that is, I sent the wrong number format, that is, I sent a 16-bit value, and the peripheral expected 8 bits.
Changing the peripheral to accept 16-bit data solved the problem.
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