IOS: Request to have the check in write function if the data is Buffer data

[duc-tran-epam]

Mobile Device Environment

• Device: any
• OS: IOS

Is your feature request related to a problem? Please describe.
Currently, the app sends Buffer data. However, the write function tries to convert it to a string, causing a failure check. As a result, the data isn't sent to the Printer device.

Describe the solution you'd like
I suggest removing the check if let sending = String(data: data, encoding: self.encoding)
or implementing another check if the data is Buffer data.

I tried to remove the condition and it's working correctly.

func write(_ data: Data) -> Bool {
    if let sending = String(data: data, encoding: self.encoding) {
        NSLog("(BluetoothDevice:writeToDevice) Writing %@ to device %@", sending, accessory.serialNumber)
        NSLog("(BluetoothDevice:writeToDevice) 2222")
        outBuffer.append(data)
        writeDataToStream((session?.outputStream)!)
    } else {
        NSLog("(BluetoothDevice:writeToDevice) Writing false")
        return false
    }

    return true
}

Additional context
Here is the buffer data we passed to write function

      const n = 42; // Feed amount
      const PRINT_AND_FEED_PAPER_COMMAND = '\x1B\x6A';

      const command = Buffer.from(PRINT_AND_FEED_PAPER_COMMAND, 'binary');
      const values = Buffer.from([n]);
      const combinedCommand = Buffer.concat([command, values]);
      await classicDevice.write(combinedCommand);

[kenjdavidson]

Feel free to open a PR, not sure what check you removed, since the "working" code you posted has the line/content that you mention you want to remove above. I'm not entirely sure why it was done that way, but it does look a little weird that I'm converting to the sending string but then never using that string.