I am doing a project where I have developed a 2-way authentication system and need to multiply a random number with a pre-stored key. the random number is sent by the Arduino using BLE. but I am receiving that data in form of string or bytes and I cannot multiply it with the key.
I am facing a similar problem and your comment helps me to understand it!!
I wonder, if this kind of information is documented anywhere? So far I was not able to find a comprehensive documentation of the BLE extension of App Inventor as well as of the App Inventor itself.
I would be grateful if somebody could send me a link ...