Can we open a APP by buttons?

[Manlio]

Can we open a APP of phone or Pad used buttons by ble? For example, press a button of slave to open the camera APP of iphone. Thanks!

[Ole Morten]

Such functionality can only be provided by the OS. For iOS I believe that it's possible for a BLE keyboard to start the camera app by sending a specific key press. It should hence be possible to create a device that pretends to be a BLE keyboard, that can be used to start the camera app and perhaps shoot a picture or similar, depending on what the OS provides. For more information on these capabilities of iOS, you'll have to refer to the MFi documentation.

However, you won't be able to do something similar to start a custom app.