TR181: Segmentation Fault with add_object Device.NAT.PortMapping.

The add function of Device.NAT.PortMapping. when it is called add new redirect section in firewall configuration with dest and src hardcoded values. After checking Openwrt firewall documentation https://openwrt.org/docs/guide-user/firewall/firewall_configuration , we find out that dest option can be removed and it will be replaced by dest_ip set through parameter https://cwmp-data-models.broadband-forum.org/tr-181-2-11-0.html#D.Device:2.Device.NAT.PortMapping.{i} For src option it will be set by Device.NAT.PortMApping.{i}.Interface.

When add request is called the section redirect will be created as follow

config redirect 'cfg1c3837' option name 'port_map_1' option target 'DNAT' option enabled '0'