simple_LSL_demo_scripted.py
PsychoPy Builder app that sends event markers to remote LSL LabRecorder

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Intro Routine
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Custom Code|Begin Experiment tab
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#establish LSL output connection
from pylsl import StreamInfo, StreamOutlet
try:
    info = StreamInfo(name="LSL_Markers",type="Markers",channel_count=1,channel_format="int32",source_id="PsychoPyMarker")
    LSL_outlet = StreamOutlet(info)
except:
    print("Unable to establish LSL outlet for PsychoPy Markers")
    sys.exit()

#open TCP socket connection to remote LSL LabRecorder
#used to send operational scripting commands to remote system
import socket
try:
    core.wait(2)
    remoteIP = ('192.168.1.100', 22345) #remote LabRecorder IP addr/port number
    LSL_socket = socket.create_connection(remoteIP)
    LSL_socket.sendall(b"filename {root:C:\\LSL\\stream} {template:psycho%n.xdf} {run:99}\n")
    core.wait(1)
    LSL_socket.sendall(b"update\n") #Labecorder scan for active LSL streams
    core.wait(2)
    LSL_socket.sendall(b"select all\n") #LabRecorder listen to all LSL streams
    core.wait(1)
    LSL_socket.sendall(b"start\n") #start LabRecorder
except:
    print("Unable to establish TCP scripting connection to remote LabRecorder")
    sys.exit()

#global variable
usd_counter = 1

#synchronous screen flip operation
def send_LSL_marker(intMarker):
    #send intMarker via LSL output stream
    LSL_outlet.push_sample([intMarker])

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trial Routine
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Custom Code|Each Frame Tab
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#send LSL Marker at stimulus onset
if frameN == 0:
    win.callOnFlip(send_LSL_marker, usd_counter)

Custom Code|End Routine Tab
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#bump stimulus counter
usd_counter += 1

Custom Code|End Experiment Tab
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#stop remote LSL LabRecorder
LSL_socket.sendall(b"stop\n")