[iOS] New Line seems not to be send corectly

[SunboX]

If I'm trying to send something like this:

bleKeyboard.print("0000111133335\n");
bleKeyboard.print("0000111133335\n");
bleKeyboard.print("0000111133335\n");
bleKeyboard.print("0000111133335\n");

it mostly gets printed on iOS like this:

0000111133335000011113333500001111333350000111133335

and sometimes like this

0000111133335000011113333500001111333350000111133335








...(never ending new lines)

I would expect it like this:

0000111133335
0000111133335
0000111133335
0000111133335

I know, there's no official OSX or iOS support yet. But it's working really well so far. Just this issue is frustrating.

[T-vK]

Try println: https://www.arduino.cc/reference/en/language/functions/usb/keyboard/keyboardprintln/
Or check: https://forum.arduino.cc/index.php?topic=243947.0

[SunboX]

Thx, will try it!

[T-vK]

The example has an example for sending an enter key as well: https://github.com/T-vK/ESP32-BLE-Keyboard/blob/master/examples/SendKeyStrokes/SendKeyStrokes.ino

[SunboX]

Sadly, none of both versions did work. I tried this one:

bleKeyboard.println("0000111133335");

and also this one:

bleKeyboard.print("0000111133335");
bleKeyboard.write(KEY_RETURN);

[T-vK]

Can you try adding delays and separating the press and release for the ENTER key?

Like this:

bleKeyboard.print("0000111133335");
delay(500); // wait 1/2 a second
bleKeyboard.press(KEY_RETURN); // Hold enter key down
delay(500); // wait 1/2 a second
bleKeyboard.release(KEY_RETURN); // Release enter key
delay(500); // wait 1/2 a second

Do other characters work? What about letters that involve the shift key? Can you test bleKeyboard.print("Hello");?

Also, can you rule out that the issue is with the app? For example by sending the keys to a different note app?

[SunboX]

Yep, that did the trick:

[SunboX]

I did some tests, 30ms has many missed line breaks, 40ms still has some occasional misses, with 50ms it seems to be fine.

[SunboX]

Can we add some config parameter for such a delay between key events?

[T-vK]

I want to keep the BLE Keyboard library compatible with the USB Keyboard library, so probably not. But feel free to write your own function that wraps the print, press, release and delay.

[T-vK]

We have added a default delay of 7 milliseconds in PR #111 and also added a setDelay method. We need some people to test it before we can merge it and release a new version though. (Especially with Mac OS and iOS devices.) Maybe you can give it a try?