[pox-dev] Modifying existing flows on a switch periodically

[Sadia Bashir]

Hi,

I want to modify queue_id in installed flows on a switch periodically by
sending a flow_mod message from controller(i.e., controller-to-switch
message) I tried it using this way on pox-controller:

def _timer_func ():
    for connection in core.openflow._connections.values():
           connection.send(of.ofp_action_nw_tos(port = 1, queue_id = 2))

def launch():
     from pox.lib.recoco import Timer
     Timer(4, _timer_func, recurring=True)

Please tell me if there is a way to modify a value in already existing flow
entries on the switch.

Thanks in advance for any hint or help.
-- 
sadia