Make it like this :
Aia Project :
NewKeypad.aia (3.7 KB)
Screenshot :
Thank you very much, I'll do that.
But now, how can I send datas to my arduino with the BLE ?
Btw, I don't want a "share button" but that each digit I click is sended to the arduino, is it possible ?
i think you should use one account
I think so, but you have to register button1 to ListOtherButton
because the ListOtherButton variable is useful for making (AnyButton.Click) not work with a button whose text will not be entered into a TextBox1
And to Get UUID Service and UUID Characteristic, Check This :
First add item
Second Add Button
Something like this ? 
From 1 to 9 right ?
Btw, I don't have an ESP32, but an arduino UNO, so what should I do ? because this don't work BLE ESP32. Bluetooth. Send. Receive. Arduino IDE
I am confused with you 
do you want all buttons (1,2,3) to send one by one number
You told me to add button1 to ListOtherButton, that's right what I did ?
And I don't have an arduino ESP32 but an arduino UNO, so I should see this : HM-10. BLE. Arduino UNO. Notify. Bluetooth. AT. iBeacon. Arrhythmia ?
Yes send one by one (when I press 1, 1 come in the LCD via the arduino, when I press 2, same , etc)
no, I mean, I think only button1 send data
oh no it was only an example, but i want all button (0 to 9 + clear and delete)
okay I understand,
do you also want to send clear and delete to Arduino?
Exactly, yes
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@Juan_Antonio Now I've updated my project so it works to send numbers automatically,
I hope you update it and add it to your topic. Thank you 
Aia Project :
NewKeypad.aia (192.1 KB)
In my code I prefer use "not Already Handled"
You can use 3 WriteStrings in a Procedure.
I'll use this code to show an example of notAlreadyHandled in another topic.
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