Nichestack, ARP and destination MAC address questions

Hello,

I'm designing a hardware component which send ethernet frames. For the configuration of the network I use Nichestack with µC OS II.

In my socket, I receive an IP address and my hardware component need to send frames to it.

To do that I need the destination MAC address corresponding to that IP address.

If I'm not wrong, I need to send an ARP request to find this address but I know that Nichestack can do it, so how to use Nichestack to send custom ARP request ?

Besides, it is highly likely that the IP address I receive is the address of the sender, so I wonder if Nichestack save last MAC addresses ?

Thanks to help me