PyNetstation EGI netstation inferface

kb12592 · September 13, 2019, 11:03am

Hi, I am trying to set up a TCP/IP connection using a stimulus presentation software known as processing (https://processing.org/).

I aim to use the TCP/IP port to send timestamps to NetStation to mark the start and end of experiment blocks. I have been able to make the connection, as the code in processing.org tells me the connection is active, but when I try to send a timestamp I get a clocksync message appear in the NetStation TCP/IP port log, but it does not print the timestamp or register an event in the ECI event tracks or event list.

I think the problem may be a formatting issue, where netstation is expecting the event input in a particular format, but I do not know what this format should be.

I have been trying to send the information in the same format as the pynetstation simple.py wrapper, e.g. I have tried sending 4-letter strings and numerical integer timestamps, but in a tab-delimited or comma-delimited format. However, I’m not sure whether this format is correct, or whether I need to send some other information to NetStation first?

Any help on understanding pynetstation or how psychopy interfaces with EGI netstation would be greatly appreciated!

Many thanks,
Kathryn

Michael · September 14, 2019, 12:22am

PsychoPy just bundles the third-party python-egi package. The source code for that is here:

e.g. the function for sending an event:

github.com

gaelen/python-egi/blob/fc1742625fe655600c04917250b333c18eb1674e/egi/simple.py#L703


    """
    A shortcut for sending the 'attention' command and the time
    info.
    """
    if (self.SendAttentionCommand()) and (self.SendLocalTime(timestamp)):
        return True
    else:
        raise EgiError("sync command failed!")


## def pack(self, key, timestamp = None, label = None, description = None, table = None, pad = False):
def send_event(self, key, timestamp=None, label=None, description=None, table=None, pad=False):
    """
    Send an event ; note that before sending any events a sync() has to be called
    to make the sent events effective .


    Arguments:
    -- 'id' -- a four-character identifier of the event ;
    -- 'timestamp' -- the local time when event has happened, in milliseconds ;
                      note that the "clock" used to produce the timestamp should be the same
                      as for the sync() method, and, ideally,
                      should be obtained via a call to the same function ;

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PyNetstation EGI netstation inferface

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