examples/ethernet_client_server/setup.py

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# install the dependancies from pip
try:
    from pip import main as pipmain
except:
    from pip._internal import main as pipmain
pipmain(['install', 'numpy'])
pipmain(['install', 'python-crontab'])
pipmain(['install', 'opencv-python'])
pipmain(['install', 'pyrealsense2'])
pipmain(['install', 'cron_descriptor'])

# using python-crontab, setup a job that is ran on the minute to check if the server is running. 
# https://pypi.org/project/python-crontab/
from crontab import CronTab
#using the system crontab file as sudo is required for librealsense aquisition
system_cron = CronTab(tabfile='/etc/crontab', user=False)
#requires the shell enviroment as ./AlwaysRunningServer.bash 
system_cron.env['SHELL'] = '/bin/bash'
job = system_cron.new(command="cd /home/$(ls /home/)/EtherSense; ./AlwaysRunningServer.bash >> /tmp/error.log 2>&1", user='root')
job.every_reboot()
i = 0
#this while loop means that the are entrys in the cron file for each 5 sec interval
while i < 60:
    #the cron job is cd to the EtherSense dir then run AlwaysRunningServer.bash, logging to /temp/error.log
    #have to use this $(ls /home/) to find home dir, assuming no other user spaces.
    job = system_cron.new(command="sleep %i; cd /home/$(ls /home/)/EtherSense; ./AlwaysRunningServer.bash >> /tmp/error.log 2>&1"%i, user='root')

    # this line sets the frequance of server checking, stars for all time slices means every minute
    job.setall('* * * * *')
    system_cron.write()
    i += 5
print('cron job set to run ' + job.description())