Software KVM Switch. Tested with Logi keyboard/mouse + Dell monitor. Inspired by https://github.com/pwr-Solaar/Solaar

README.md

Requirement

on macOS

brew install hidapi
brew install ddcctl

on Linux

modprobe i2c-dev
pip install monitorcontrol

on both

pip install hid

kvm-switch.py

#!/usr/bin/env python
import sys
import hid
import os

host = int(sys.argv[1]) - 1

monitor_input_sources = [17, 18, 27]  # HDMI 1, HDMI 2, USB-C

hid_devices = [
    {
        'name': 'Logi Bolt Receiver',
        'receivers': hid.enumerate(0x046D, 0xC548),
        'command': [  # MX Keys Mini as first device on the receiver
            bytes([0x11, 0x01, 0x09, 0x1A, 0x00] + [0] * 15),  # change host to 1
            bytes([0x11, 0x01, 0x09, 0x1F, 0x01] + [0] * 15),  # change host to 2
            bytes([0x11, 0x01, 0x09, 0x1D, 0x02] + [0] * 15)]  # change host to 3
    }, {
        'name': 'Logitech Unified Receiver',
        'receivers': hid.enumerate(0x046D, 0xC52B),
        'command': [  # MX Anywhere 3 as first device on the receiver
            bytes([0x11, 0x01, 0x0A, 0x1A, 0x00] + [0] * 15),  # change host to 1
            bytes([0x11, 0x01, 0x0A, 0x1E, 0x01] + [0] * 15),  # change host to 2
            bytes([0x11, 0x01, 0x0A, 0x19, 0x02] + [0] * 15)]  # change host to 3
    }, {
        'name': 'MX Keys Mini Bluetooth',
        'receivers': hid.enumerate(0x046D, 0xB36E),
        'command': [
            bytes([0x11, 0xFF, 0x09, 0x1E, 0x00] + [0] * 15),  # change host to 1
            bytes([0x11, 0x01, 0x09, 0x1F, 0x01] + [0] * 15),  # change host to 2
            bytes([0x11, 0xFF, 0x09, 0x1D, 0x02] + [0] * 15)]  # change host to 3
    }, {
        'name': 'MX Anywhere 3 Bluetooth',
        'receivers': hid.enumerate(0x046D, 0xB025),
        'command': [
            bytes([0x11, 0xFF, 0x0A, 0x1A, 0x00] + [0] * 15),  # change host to 1
            bytes([0x11, 0x01, 0x0A, 0x1E, 0x01] + [0] * 15),  # change host to 2
            bytes([0x11, 0xFF, 0x0A, 0x19, 0x02] + [0] * 15)]  # change host to 3
    }
]

for d in hid_devices:
    for r in d['receivers']:
        if r['usage_page'] >= 0xFF00:  # and r['usage'] == 1 and
            print('found:', d['name'], 'path:', r['path'])
            try:
                receiver = hid.Device(path=r['path'])
                receiver.nonblocking = 1
                data = d['command'][host]
                print("sending:", data)
                receiver.write(data)
                receiver.close()
            except hid.HIDException as err:
                print(err)

if sys.platform == 'darwin':
    os.system(f'/usr/local/bin/ddcctl -d 1 -i {monitor_input_sources[host]}')
else:
    import monitorcontrol
    try:
        m = monitorcontrol.get_monitors()[0]
        i = monitor_input_sources[host]
        print('display input source:', i)
        with m:
            m.set_input_source(i)
    except Exception as e:
        print(e)