two clients and one simulation

client1.py

import os
import sys
import optparse
import time
import threading


if 'SUMO_HOME' in os.environ:
    tools = os.path.join(os.environ['SUMO_HOME'], 'tools')
    sys.path.append(tools)
else:
    sys.exit("please declare environment variable 'SUMO_HOME'")

from sumolib import checkBinary  # Checks for the binary in environ vars
import traci

import sumolib
from sumolib.miscutils import getFreeSocketPort
port = sumolib.miscutils.getFreeSocketPort()



class ATCS:
    def __init__(self):
        pass


    def get_options(self):
        optParser = optparse.OptionParser()
        optParser.add_option("--nogui", action="store_true",
                             default=True, help="run the commandline version of sumo")
        options, args = optParser.parse_args()
        return options



if __name__ == "__main__":



    env = ATCS()
    options = env.get_options()

    # check binary
    if options.nogui:
        sumoBinary = checkBinary('sumo')
    else:
        sumoBinary = checkBinary('sumo-gui')

    #PORT = port

    PORT = 41533
    #PORT = int(sys.argv[1])

    i = 0
    step = 0
    while 1:
        traci.start([sumoBinary, "-c", "atcs2.sumocfg",  '--start', "--num-clients", "2"], port=PORT)
        #traci.start([sumoBinary, "-c", "atcs2.sumocfg", '--start', "--num-clients", "2"], port = PORT)
        traci.setOrder(1)  # number can be anything
        step += 1
        while traci.simulation.getMinExpectedNumber() > 0:
            traci.simulationStep()
            print("In client_1" ,step, i)
            i = i+ 1
            # more traci commands
        traci.close()

client2.py

import os
import sys
import optparse
import time
import threading


if 'SUMO_HOME' in os.environ:
    tools = os.path.join(os.environ['SUMO_HOME'], 'tools')
    sys.path.append(tools)
else:
    sys.exit("please declare environment variable 'SUMO_HOME'")

from sumolib import checkBinary  # Checks for the binary in environ vars
import traci

import sumolib
from sumolib.miscutils import getFreeSocketPort
port = sumolib.miscutils.getFreeSocketPort()


class ATCS:
    def __init__(self):
        pass


    def get_options(self):
        optParser = optparse.OptionParser()
        optParser.add_option("--nogui", action="store_true",
                             default=False, help="run the commandline version of sumo")
        options, args = optParser.parse_args()
        return options



if __name__ == "__main__":



    env = ATCS()
    options = env.get_options()

    # check binary
    if options.nogui:
        sumoBinary = checkBinary('sumo')
    else:
        sumoBinary = checkBinary('sumo-gui')

    PORT = 41533
    #PORT = int(sys.argv[1])
    # traci.start(["sumo", "-c", "atcs2.sumocfg", "--num-clients", "2"], port=PORT)
    step = 0
    j = 0
    while 1:
        print('step = ',step)
        step = step +1
        traci.init(PORT)
        traci.setOrder(2)  # number can be anything as long as each client gets its own number
        while traci.simulation.getMinExpectedNumber() > 0:
            traci.simulationStep()
            print("In client_2", step , j)
            j = j + 1
            # more traci commands
        traci.close()