How to send triggers to SR Eyelink Plus Eye-tracker using trigger_handler?

[prashantig25]

Dear @jodeleeuw, @becky-gilbert and All,

I have jsPsych task that I would like to use to collect pupillometry data with the SR Eyelink Plus Eye-tracker. I am trying to use Dr. Tünnermann's trigger_handler https://github.com/jt-lab/trigger_handler to send triggers from the PC on which the experiment runs to the Eyelink PC with a parallel port connection.

To use the trigger_handler, I have adjusted its configuration to my setting, in the trigger_handler.py code:

APP_HOST = '127.0.0.1'
APP_PORT = 8000

PARALLEL = True # To use a parallel connection
LPT_INTERFACE = 0xD050 # Parallel port address of the experiment PC

TCP = False # Don't need the TCP connection
TCP_HOST = '127.0.0.1'
TCP_PORT = 50000

After making these adjustments and copying inpoutx64.dll (for the 64 bit sysyem) to the folder, I run the trigger_handler.py in the terminal.
The terminal message does not show [FAIL] but it does not show [SUCCESS] either. Instead it simply shows the following message:

• Serving Flask app "trigger_handler" (lazy loading)
• Environment: production
  WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
• Debug mode: off
• Running on http://127.0.0.1:8000/ (Press CTRL+C to quit)

Another issue that I notice is that irrespective of whether I enter the correct or the incorrect PP address in the LPT_INTERFACE, I get the same terminal message. My expectation would be that if I enter the incorrect PP card address, the terminal message should show [FAIL]. I would like the terminal message to show [SUCCESS] for the correct PP address and [FAIL] for the incorrect address.

Additionally, when I try sending triggers via the browser, using an URL, it shows that I have successfully sent the triggers, but the triggers don't get recorded by the Eyelink PC.

I have checked the parallel port cards of both PCs and the cable connecting them.

So could be particular reason for the same? And how can I successfully send triggers?

Thank you!

Sincerely,
Prashanti