Re: [lwip-users] LLDP Implementation for lwIP

[Amit Ashara]

Hello Sergio,

Yes, I went through the link

http://lwip.wikia.com/wiki/LwIP_with_or_without_an_operating_system

The netif_add calls the function tivaif_init from the porting file. Inside the function tivaif_init the function call is as follows

  psNetif->output = etharp_output;
  psNetif->linkoutput = tivaif_transmit;

If i check the tivaif_transmit function, "tivaif_transmit(struct netif *psNetif, struct pbuf *p)" it maps the pbuf to the MAC controller for transmission. It is this buffer that needs to be modified for LLDP frame. However the call stack is always from TCP or DHCP (even when ARP is called which is a link layer packet).

Regards

Amit