DHCP address in lwip

[steved]

Certainly be interested to see an alternative to LWIP. I've not looked in detail yet, but a potential downside for picoTcp is that it is GPL-licensed (same as WolfSSL) which is going to make it significantly less attractive than Lwip for some.

[Giovanni]

Yes, it is GPL only, still good for the FOSS users.

If you guys think it is worth the effort we may try to contact them to discuss additional licensing options.

Giovanni

[danielinux]

Sorry about the delay, due to FOSDEM weekend etc.

About the wolfSSL integration:
yes, picoTCP is supported natively by wolfSSL, and I've already worked on industrial production projects using wolfSSL TLS sockets on top of picoTCP (on Cortex-M3/M4 devices).

About the license:
picoTCP is owned by Altran Belgium, and AFAIK they provide non-GPL licenses (at user's option) to integrate into non-Free projects. It's basically the same licensing model as wolfSSL

[steved]

Found a way to get the address as set by DHCP, so no need for patch:

Code: Select all

#include "lwip/def.h"
#include "lwip/netif.h"

/*
 * https://techoverflow.net/2015/03/16/accessing-lwip-struct-netif-instance-in-chibios/
 */
uint32_t getCurrentNetworkAddress(uint8_t addrType)
{
  if (netif_default == NULL)
    return 0;
  switch (addrType)
  {
  case 1 :
    return ntohl(netif_default->netmask.addr);
  case 2 :
    return ntohl(netif_default->gw.addr);
  case 0 :
  default :
    return ntohl(netif_default->ip_addr.addr);
  }
}


Works OK on a quick check