This is the result of my own risk assessment and mitigation thoughts, and doesn't constitute a recipe for anyone seeking to do the same thing - may be worth considering the above, but research the risks yourself. How does it connect according to hcitool con yet not be registered as an input device (and register any inputs)? It turns out that the iOS buttons sends Volume Up (key 123) whereas the Android button sends Enter (key 36). It works! Sorta...

AB Shutter 3 Bluetooth Remote Shutter control Android and iOS AB Shutter 3 Bluetooth Remote Shutter control Android and iOS

Override the onKeyUp() (in your Activity) and assign some actions to the keys that you wish to use: @Override The script needs to be re-run every time the Bluetooth connection is re-established. Probably best to run it on reconnect as part of the Python code above. Basically that’s what you will have and don’t expect for any cables. 🙂 Yes folks! There’s no cables included since you will be maximizing the included battery. And like any Bluetooth V3, you can take the shot within 10m radius.The device actually does not show up as an input in /dev/input/. When I connect it manually through the GUI, it shows up as /dev/input/event5. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. Pressing the selfie-button instantly sends the command to my computer! Well... until the button goes to sleep. The device is powered by a CR2032 battery which, despite the power efficiencies of Bluetooth, isn't magical. I planned on using a bluetooth button instead as the Dash is limited to 1000 presses before it dies and the battery is hardwired... But, there are many events that occur with each button push. For example when I push what is probably "KEY_3" I see this:

AB shutter 3 to my iPhon… - Apple Community Can’t connect my AB shutter 3 to my iPhon… - Apple Community

I was thinking that all I need is to figure out the button press from Bluetooth, but as you say, the bluetooth button goes to sleep mode, and wakes up on first press? Reply The selfie remote shows up in Android as a Bluetooth keyboard, right? Or as a HID (Human Interface Device) in general.

What I Have Done

Open your camera application on your phone just as you always do when you are about to take a picture. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.