int nodeID = getId();
cModule* parent = getParentModule();
cModule* module;
this->num_nodes = parent->par("numHosts");
for(int i = 1; i <= simulation.getLastModuleId(); i++)
    {
        module = simulation.getModule(i);
        if (module->getId() != nodeID)
        {
             // Some code
        }
    }