Implemented grabbing input device (#58)

* Implemented grabbing input device

* Chmod scripts executable

* Bump version

* Chmod main script executable

* Use shell wrapper script that activates venv
Add pip constraints

* Chmod scripts

* Remove dot imports

* Add blank line

* Modify log messages

* Bump version

* Update performs a clean reinstall

* Fix executable path

* Preserve repo ownership

* Fix stat dir

* Remove constraints

* Re-enable constraints

* Preserve currently checked out branch

* Add cleanup function

* Add cd to parent dir

* Adapt reboot hint

* Adapt to latest script changes

* Remove unnecessary blank lines

* Update to v0.6.6

* Add adafruit-circuitpython-typing

* Set fixed version

* Fix missing =

* Reduce delays

* Keep track of relayed devices

* Add debug output

* Initialize gadgets once and share across module

* Move device functions to __init__.py

* Move device functions back to relay.py

* Remove temporary debug output
Bump version

* Defer USB device init

* Check gadget state on relay init
Rename symbols

* Improve gadget init debug output

* Update to v0.6.7

* Show versions before updating

* Change to project dir first

* Use variables instead of hard-coded paths

* Make user owner of all files

* Leave chmod to install.sh

* Preserve ownership before installing

* Bump version

---------

Co-authored-by: Hannes U @cylonid 
Co-authored-by: Benjamin T @quaxalber

Author: cylonid

README.md

@@ -151,7 +151,7 @@ Follow these steps to install and configure the project:
                  └─1326 python3.11 /home/user/bluetooth_2_usb/bluetooth_2_usb.py --auto_discover
 
     Dec 02 23:16:37 pi0w systemd[1]: Started bluetooth_2_usb.service - Bluetooth to USB HID relay.
-    Dec 02 23:16:39 pi0w bluetooth_2_usb[1326]: 23-12-02 23:16:39 [INFO] Launching Bluetooth 2 USB v0.6.7
+    Dec 02 23:16:39 pi0w bluetooth_2_usb[1326]: 23-12-02 23:16:39 [INFO] Launching Bluetooth 2 USB v0.7.0
     Dec 02 23:16:39 pi0w bluetooth_2_usb[1326]: 23-12-02 23:16:39 [INFO] Discovering input devices...
     Dec 02 23:16:42 pi0w bluetooth_2_usb[1326]: 23-12-02 23:16:42 [INFO] Activated relay for device /dev/input/event2, name "AceRK Mouse", phys "a1:b2:c3:d4:e5:f6"
     Dec 02 23:16:45 pi0w bluetooth_2_usb[1326]: 23-12-02 23:16:45 [INFO] Activated relay for device /dev/input/event1, name "AceRK Keyboard", phys "a1:b2:c3:d4:e5:f6"
@@ -368,7 +368,7 @@ Here's a few things you could try:
   user@pi0w:~ $ sudo service bluetooth_2_usb stop && sudo bluetooth_2_usb -ad ; sudo service bluetooth_2_usb start
   23-12-12 13:03:28 [DEBUG] CLI args: Namespace(device_ids=None, auto_discover=True, debug=True, log_to_file=False, log_path='/var/log/bluetooth_2_usb/bluetooth_2_usb.log', version=False, list_devices=False)
   23-12-12 13:03:28 [DEBUG] Logging to stdout
-  23-12-12 13:03:28 [INFO] Launching Bluetooth 2 USB v0.6.7
+  23-12-12 13:03:28 [INFO] Launching Bluetooth 2 USB v0.7.0
   23-12-12 13:03:28 [INFO] Discovering input devices...
   23-12-12 13:03:28 [DEBUG] Auto-discovery enabled. Relaying all input devices.
   23-12-12 13:03:28 [DEBUG] Initializing USB gadgets...

bluetooth_2_usb.py

@@ -13,7 +13,7 @@
 
 
 _logger = get_logger()
-_VERSION = "0.6.7"
+_VERSION = "0.7.0"
 _VERSIONED_NAME = f"Bluetooth 2 USB v{_VERSION}"
 
 
@@ -48,7 +48,7 @@ async def _main() -> NoReturn:
     _logger.debug(log_handlers_message)
     _logger.info(f"Launching {_VERSIONED_NAME}")
 
-    controller = RelayController(args.device_ids, args.auto_discover)
+    controller = RelayController(args.device_ids, args.auto_discover, args.grab_devices)
     await controller.async_relay_devices()
 
 

bluetooth_2_usb.service

@@ -4,7 +4,7 @@ After=multi-user.target
 
 [Service]
 User=root
-ExecStart=/usr/bin/bluetooth_2_usb --auto_discover
+ExecStart=/usr/bin/bluetooth_2_usb --auto_discover --grab_devices
 Environment=PYTHONUNBUFFERED=1
 Restart=on-failure
 

src/bluetooth_2_usb/args.py

@@ -73,6 +73,13 @@ def parse_args() -> Namespace:
         default=False,
         help="List all available input devices and exit.",
     )
+    parser.add_argument(
+        "--grab_devices",
+        "-g",
+        action="store_true",
+        default=False,
+        help="Grab the input devices, i.e., suppress any events on your relay device (RPi).",
+    )
 
     args = parser.parse_args()
 

src/bluetooth_2_usb/relay.py

@@ -106,8 +106,10 @@ def matches(self, device: InputDevice) -> bool:
 
 
 class DeviceRelay:
-    def __init__(self, input_device: InputDevice):
+    def __init__(self, input_device: InputDevice, grab_device: bool = False):
         self._input_device = input_device
+        if grab_device:
+            self._input_device.grab()
         if not all_gadgets_ready():
             init_usb_gadgets()
 
@@ -178,12 +180,16 @@ class RelayController:
     """
 
     def __init__(
-        self, device_identifiers: list[str] = None, auto_discover: bool = False
+        self,
+        device_identifiers: list[str] = None,
+        auto_discover: bool = False,
+        grab_devices: bool = False,
     ) -> None:
         if not device_identifiers:
             device_identifiers = []
         self._device_ids = [DeviceIdentifier(id) for id in device_identifiers]
         self._auto_discover = auto_discover
+        self._grab_devices = grab_devices
         self._cancelled = False
         self._device_relay_paths: list[str] = []
 
@@ -230,7 +236,7 @@ def _create_task(self, device: InputDevice, task_group: TaskGroup) -> None:
 
     async def _async_relay_events(self, device: InputDevice) -> NoReturn:
         try:
-            relay = DeviceRelay(device)
+            relay = DeviceRelay(device, self._grab_devices)
             self._device_relay_paths.append(device.path)
             _logger.info(f"Activated {repr(relay)}")
             await relay.async_relay_events_loop()