class Participant:
    def __init__(self, ip_address, port):
        self.ip_addres = ip_address
        self.port = port
        self.things = set({ None })

    def Add(self, thing):
        thing.id = len(self.things)
        self.things.add(thing)
    
    def Get(self, network_id, thing_id):
        for thing in self.things:
            if thing is not None:
                if thing.network_id == network_id and thing.id == thing_id:
                    return thing
        return None

    ## Update all things
    def Update(self, currentTimeMs):
        for thing in list(self.things):
            if thing is not None:
                thing.update(currentTimeMs)