2023-12-14 14:54:43 +01:00
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2024-04-05 22:56:10 +02:00
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title = "Intercepting Bluetooth Keyboard Events"
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date = 2023-12-14
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2023-12-14 14:54:43 +01:00
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[taxonomies]
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tags = ["linux"]
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categories = ["keyboard", "bluetooth"]
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+++
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# Intercepting Bluetooth Keyboard Events
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I like keyboards and I like custom keyboards. However many do not allow sufficient configuration to let
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a key be Ctrl on hold and Esc on top. Notably the HHKB.
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USB devices are nicely listed in */dev/input/by-id/* folder but on my system the event device is anonymously placed in */dev/input/*.
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## Figuring out the name
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```
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❯ for dev in /dev/input/*; do udevadm info --attribute-walk $dev; done | grep -A10 -B10 Keyboard
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Unknown device "/dev/input/by-id": No such device
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Unknown device "/dev/input/by-path": No such device
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ATTRS{capabilities/led}=="1f"
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ATTRS{capabilities/msc}=="10"
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ATTRS{capabilities/rel}=="0"
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ATTRS{capabilities/snd}=="0"
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ATTRS{capabilities/sw}=="0"
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ATTRS{id/bustype}=="0005"
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ATTRS{id/product}=="0021"
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ATTRS{id/vendor}=="04fe"
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ATTRS{id/version}=="0001"
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ATTRS{inhibited}=="0"
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ATTRS{name}=="HHKB-Hybrid_1 Keyboard"
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ATTRS{phys}=="04:33:c2:f4:e9:70"
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ATTRS{power/control}=="auto"
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ATTRS{power/runtime_active_time}=="0"
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ATTRS{power/runtime_status}=="unsupported"
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ATTRS{power/runtime_suspended_time}=="0"
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ATTRS{properties}=="0"
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ATTRS{uniq}=="cb:7a:7c:03:2d:f2"
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```
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for other keyboards a bit of finagling for searching with grep might be needed or pipe into *less* and scroll till you find it.
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Now I can add it to my */etc/interception/udevmon.d/ctrl_tap_esc.yaml :
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```
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- JOB: "intercept -g $DEVNODE | dual-function-keys -c /etc/interception/dual-function-keys.yaml | uinput -d $DEVNODE"
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DEVICE:
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NAME: "PFU Limited HHKB-Hybrid"
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EVENTS:
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EV_KEY: [KEY_LEFTCTRL]
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- JOB: "intercept -g $DEVNODE | dual-function-keys -c /etc/interception/dual-function-keys.yaml | uinput -d $DEVNODE"
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DEVICE:
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NAME: "PFU Limited HHKB-Hybrid Keyboard"
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EVENTS:
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EV_KEY: [KEY_LEFTCTRL]
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- JOB: "intercept -g $DEVNODE | dual-function-keys -c /etc/interception/dual-function-keys.yaml | uinput -d $DEVNODE"
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DEVICE:
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NAME: "HHKB-Hybrid_1 Keyboard"
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EVENTS:
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EV_KEY: [KEY_LEFTCTRL]
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```
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The first 2 are for USB but that is still a work in progress
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