CC3301: LWiP dns_gethostbyname not working

Thomas Bødker

Part Number: CC3301

I am trying to make an application with the new CC3301 and I have alot of things working.

Device is connected to AP and IP address is obtained.

But now i am a bit stuck trying to resolve an IP address from a hostname using the LWiP dns_gethostbyname(...) method.

This is the linie where i am calling the lookup:

uint32_t RetVal = dns_gethostbyname("www.example.com", &TargetIp, dnsFound, NULL);

The callback is never called
and when I trace down - I get to this section below in the dns.c file

for (i = 0; i < DNS_TABLE_SIZE; ++i) {
if ((dns_table[i].state == DNS_STATE_DONE) &&
(lwip_strnicmp(name, dns_table[i].name, sizeof(dns_table[i].name)) == 0) &&
LWIP_DNS_ADDRTYPE_MATCH_IP(dns_addrtype, dns_table[i].ipaddr)) {
LWIP_DEBUGF(DNS_DEBUG, ("dns_lookup: \"%s\": found = ", name));
ip_addr_debug_print_val(DNS_DEBUG, dns_table[i].ipaddr);
LWIP_DEBUGF(DNS_DEBUG, ("\n"));
if (addr) {
ip_addr_copy(*addr, dns_table[i].ipaddr);
}
return ERR_OK;
}

The dns_table state is never DNS_STATE_DONE ?

Do you have an idea on what might be happening here ?

Kind regards

Thomas

over 2 years ago

0 Kobi Leibovitch over 2 years ago

TI__Guru 63006 points

have you tried locking the TCPIP_CORE?

LOCK_TCPIP_CORE();
lwipRet = dns_gethostbyname(pURL, ctx.pIpAddr, DnsCb_found, &ctx);
UNLOCK_TCPIP_CORE();

This does work for me.

0 Thomas Bødker over 2 years ago in reply to Kobi Leibovitch

Intellectual 380 points

Hi Kobi

Thanks for fast the response!

It works for me as well. It takes about 10 sec. then the callback kicks in.

I am new to the LWiP Stack, Code Composer and the tool chain in general, so i am learning a lot right now :-)

Kind regards

Thomas

Wi-Fi

Wi-Fi forum

CC3301: LWiP dns_gethostbyname not working