launching openBCI LSL stream from python script

compmonks · March 2017

Hi all,

I am trying to launch a LSL stream directly from a python script but cannot get it right.

The following command works perfectly and indicates that no package is missing for LSL:

#

python user.py -p /dev/cu.OpenBCI-DQ007MS3 -a streamer_lsl -d --log

#

Here is the code below

Any idea?

#MODULES

import subprocess

import os

import time

#

# Main Variables OBCI

#

P_Scan = /dev/cu.OpenBCI-DQ007MS3

O_Port = " -p %s" % (P_Scan)

O_Stream = " -a %s" % ("streamer_lsl")

O_Daisy = " -d"

O_Log = " --log"

O_UserFile = "python ~/Git/OpenBCI_Python/user.py"

O_Init = "%s%s%s%s%s" % (O_UserFile, O_Port, O_Stream, O_Daisy, O_Log)

O_Start = "/start"

# Clear Terminal

os.system('cls' if os.name == 'nt' else 'clear')

#

# MAIN TESTS

#

def main():

if P_Scan == None:

print("--> ERROR: ","-"*60)

print("--> No Device Found.")

O_Act = False

else:

try:

print("--> BOARD LAUNCH: ","-"*60)

print("--> using port: %s" % (P_Scan))

#Launch OBCI board streaming

p = subprocess.Popen([O_Init],shell=True,stdout=subprocess.PIPE,stdin=subprocess.PIPE)

p.stdin.write(O_Start)

print("--> OK.")

O_Act = True

except():

print("--> ERROR: ","-"*60)

print("--> CAN'T STREAM WITH OBCI DEVICE.")

O_Act = False

return O_Act

#

if __name__ == '__main__':

main()

#

wjcroft · March 2017

Mentioning Jeremy @jfrey, the developer.

jfrey · March 2017

Hi,

I am not sure to understand what you are trying to achieve here. You want to launch an external python script within a python script?? You could directly use the openbci api and LSL if you need to integrate that to your program, or you can also create a new plugin -- and if you want to launch the command... well, bash is nice

What is the result of you command? I don't see anything wrong here. If it return directly, it might be due to the fact that the main process return right after the subprocess is created.

Jeremy

launching openBCI LSL stream from python script

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