I would like to increase the rate at which my app receives and processes data from a peripheral. I seem to remember reading that the iPhone's baud rate can be increased. How is this done?

Is there a limit to the speed at which information can be printed in a label on the iPhone screen? I seem to recall reading that this rate is restricted until a developer joins the Apple Developers' Group. I am writing in Swift, using Xcode.

I have the following code in my app, which reads a single byte send from a peripheral. I now want to read 20 bytes sent together from the peripheral. How do I change the swift code? func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) { var u16: UInt8 u16 = UInt8((characteristic.value! as NSData).bytes.bindMemory(to: Int.self, capacity: characteristic.value!.count).pointee)// get input ascii value // let chart = Character(UnicodeScalar(u16))// make into a character //