Dear SUMO community.
I installed SUMO svn sources on September 2013.
I wanted to test the TraCI subscriptions, so I modified the *run* function
of the script %SUMO_HOME%\docs\tutorial\traci_tls\runner.py as follows:
def run():
"""execute the TraCI control loop"""
traci.init(PORT)
programPointer = len(PROGRAM)-1
step = 0
traci.inductionloop.subscribe("0",[tc.LAST_STEP_VEHICLE_NUMBER],0,3600)
while traci.simulation.getMinExpectedNumber() > 0:
traci.simulationStep()
programPointer = min(programPointer+1, len(PROGRAM)-1)
# no = traci.inductionloop.getLastStepVehicleNumber("0") Without
TraCI subscriptions
no =
traci.inductionloop.getSubscriptionResults("0")[tc.LAST_STEP_VEHICLE_NUMBER]
if no > 0:
programPointer = (0 if programPointer == len(PROGRAM)-1 else 3)
traci.trafficlights.setRedYellowGreenState("0",
PROGRAM[programPointer])
step += 1
traci.close()
sys.stdout.flush()
As you can see, I added the command
traci.inductionloop.subscribe("0",[tc.LAST_STEP_VEHICLE_NUMBER],0,3600)
before the while loop which performs the simulation steps; and the command
no =
traci.inductionloop.getSubscriptionResults("0")[tc.LAST_STEP_VEHICLE_NUMBER]
after performing the simulation step.
>From the first to the third time steps, after the execution of the
traci.sendExact() command within traci.simulationStep(), the following
result is obtained:
'\x07\x02\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x13\xe0\x00\x00\x00\x010\x01\x10\x00\t\x00\x00\x00\x00'
The bytes from 7 to 10 (counting from 0): x00\x00\x00\x01, indicate that
the number of subscriptions is one, so everything is OK so far. However, in
the fourth time step (in which I can see the first vehicles enter the
network), the result is:
'\x07\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00'
The bytes from 7 to 10 (counting from 0): x00\x00\x00\x00, indicate that
the number of subscriptionsis zero!!
Am I doing something wrong?
Thanks in advance!!
--
Andres Felipe Acosta Gil
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