lsl_emulator.py

# This code is adapted from the following repository:
#   https://github.com/chkothe/pylsl/blob/master/examples/SendData.py

import random
import time
from pylsl import StreamInfo, StreamOutlet

def start_lsl():
    # Initialize an LSL stream by providing the stream-name ('BioSemi'),
    # signal type ('EEG'), number of channels (8 for the OpenBCI Mark IV headset),
    # sampling frequency (250 for the OpenBCI Mark IV headset), the data type ('float32'),
    # and the user-id.
    info = StreamInfo('BioSemi', 'EEG', 8, 250, 'float32', 'myuid34234')

    # Create a server outlet.
    outlet = StreamOutlet(info)

    while True:

        # Create random 8-channel sample.
        mysample = [random.random(), random.random(), random.random(),
                    random.random(), random.random(), random.random(),
                    random.random(), random.random()]

        # Send the signal and wait 4ms for the next data post (emulating 250 Hz sampling rate).
        outlet.push_sample(mysample)
        time.sleep(0.04)

if __name__ == '__main__':
    start_lsl()