InSpiNNuator - Pretend to be a SpiNNaker board transmitting UDP packets to a host. Packets resemble those produced by io_printf.

inspinnuator.py

import random, struct, socket, time

def generate_packet( data ):
    """Generates a random SpiNNaker UDP Packet with a random
    chip x, y and core (taken from some sensible range)."""
    # Pick x, y, core
    x = random.randint( 0, 4 )
    y = random.randint( 0, 4 )
    core = random.randint( 0, 17 )
    
    # Construct the packet
    flags = iptag = dest_port = dest_addr = 0x0
    srce_port = 0x1f & core

    data = "<%2d, %2d, %2d> " % (x, y, core) + data

    packet = struct.pack( "!2x 4B H 2B 4x", flags, iptag, dest_port, srce_port,
                          dest_addr, x, y ) + data
    return packet

if __name__ == "__main__":
    # Create a socket
    sock = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )

    try:
        while True:
            message = time.strftime( "%H:%M:%S" ) + " inSpiNNuate!"
            packet = generate_packet( message )

            # Transmit packet
            try:
                sock.sendto( packet, ("127.0.0.1", 17892) )
            except socket.error, e:
                print( e )
                time.sleep( 0.1 )
            
            # Pause some amount of time
            time.sleep( random.random() )
    except KeyboardInterrupt:
        pass
    finally:
        # Close the socket
        sock.close()