102 lines
3.7 KiB
Python
102 lines
3.7 KiB
Python
#!/usr/bin/env python3
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import socket
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import struct
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import sys
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import libevdev
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#from libevdev import ecodes
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def main(device_path, dest_ip, dest_port):
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"""
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Reads absolute X and Y coordinates from an evdev device and sends them
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over UDP to a specified address and port.
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Args:
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device_path (str): The path to the input event device
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(e.g., /dev/input/event0).
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dest_ip (str): The destination IP address.
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dest_port (int): The destination port.
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"""
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try:
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# Open the evdev device in a non-blocking way
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fd = open(device_path, 'rb')
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d = libevdev.Device(fd)
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print(f"Successfully opened device: {d.name}")
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print("Listening for ABS_X and ABS_Y events. Press Ctrl+C to exit.")
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# Create a UDP socket
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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print(f"Sending coordinates to {dest_ip}:{dest_port}")
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# Variables to store the latest coordinates
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x_coor = None
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y_coor = None
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# Loop indefinitely to read events
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while True:
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for e in d.events():
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# We are only interested in absolute axis events
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if e.type == libevdev.EV_ABS:
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if e.code in [libevdev.EV_ABS.ABS_X,libevdev.EV_ABS.ABS_MT_POSITION_X]:
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x_coor = e.value
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elif e.code in [libevdev.EV_ABS.ABS_Y,libevdev.EV_ABS.ABS_MT_POSITION_Y]:
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y_coor = e.value
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# When we have both coordinates, send them
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if x_coor is not None and y_coor is not None:
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print(f"Read coordinates: X={x_coor}, Y={y_coor}")
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# Pack the two 16-bit unsigned integers into a buffer.
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# The format string 'HH' specifies two unsigned short integers (u16).
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# The '<' character ensures little-endian byte order.
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try:
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packet = struct.pack('<HH', (float(x_coor)/32767.0)*1920, (float(y_coor)/32767.0)*1080)
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# Send the packet over UDP
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sock.sendto(packet, (dest_ip, dest_port))
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print(f"Sent {len(packet)} bytes.")
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# Reset coordinates to wait for the next pair of events
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x_coor = None
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y_coor = None
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except struct.error as se:
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print(f"Error packing data: {se}. Coordinates might be out of range for u16 (0-65535).")
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except socket.error as soe:
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print(f"Socket error: {soe}")
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except FileNotFoundError:
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print(f"Error: Device not found at {device_path}")
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print("Please ensure you have the correct event device path.")
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except PermissionError:
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print(f"Error: Permission denied for {device_path}.")
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print("This script usually needs to be run with root privileges (e.g., 'sudo python3 script.py')")
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except KeyboardInterrupt:
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print("\nExiting.")
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finally:
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if 'fd' in locals() and not fd.closed:
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fd.close()
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if 'sock' in locals():
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sock.close()
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if __name__ == "__main__":
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if len(sys.argv) != 4:
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print("Usage: python3 evdev_udp_sender.py <device_path> <dest_ip> <dest_port>")
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print("Example: sudo python3 evdev_udp_sender.py /dev/input/event4 127.0.0.1 12345")
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sys.exit(1)
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device = sys.argv[1]
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ip = sys.argv[2]
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try:
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port = int(sys.argv[3])
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if not (0 < port < 65536):
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raise ValueError
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except ValueError:
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print("Error: Port must be an integer between 1 and 65535.")
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sys.exit(1)
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main(device, ip, port)
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