while(true){
hotlink=struct_get(nb_status("wan"),"WAN_HOTLINK");
switch(hotlink){
     case "WANLINK1": nb_config_set("custom.var2=LAN"); break;
     case "WANLINK2": nb_config_set("custom.var2=WLAN"); break;
     case "WANLINK3": nb_config_set("custom.var2=WWAN1"); break;
     case "WANLINK4": nb_config_set("custom.var2=WWAN2"); break;
     default: nb_config_set("custom.var2=kein link ist Hotlink"); break;
}
}