WICED Studio Wi-Fi Combo

[MaGr_2160016]

Every once in a while the second call to wiced_hostname_lookup() in sequence below returns the same IP address of the first call:    WPRINT_APP_INFO(("Resolving IP address of Cometa server" ));    wiced_hostname_lookup("service.cometa.io", &ip_address, 15000);    WPRINT_APP_INFO(("Cometa is at %u.%u.%u.%u", (uint8_t)(GET_IPV4_ADDRESS(ip_address) >> 24),                                                  (uint8_t)(GET_IPV4_ADDRESS(ip_address) >> 16),                                                  (uint8_t)(GET_IPV4_ADDRESS(ip_address) >> 8),                                                  (uint8_t)(GET_IPV4_ADDRESS(ip_address) >> 0) ) );     #define APP_SERVER "www.cloudfridge.io"    WPRINT_APP_INFO( ( "Resolving IP address of Application server %s", APP_SERVER));    result = wiced_hostname_lookup(APP_SERVER, &app_ip_address, 15000); if (result != WICED_SUCCESS) {       WPRINT_APP_INFO(("Error in DNS lookup for App server."));       return;      }    WPRINT_APP_INFO( ( "App server is at %u.%u.%u.%u", (uint8_t)(GET_IPV4_ADDRESS(app_ip_address) >> 24),                                                  (uint8_t)(GET_IPV4_ADDRESS(app_ip_address) >> 16),                                                  (uint8_t)(GET_IPV4_ADDRESS(app_ip_address) >> 8),                                                  (uint8_t)(GET_IPV4_ADDRESS(app_ip_address) >> 0)));

[MaGr_2160016]

It is an issue in 2.4. In general I find wiced_hostname_lookup() very unreliable.

[GregG_16]

Some more comments:

Part of this may be because the lookup() function sends a UDP request to all the registered DNS servers, and then waits for the remaining time (derived from the timeout passed to lookup()), for a reply. So, there is actually no retries happening.

[MaGr_2160016]

This explains the behavior I am seeing. It may be worthwhile documenting.

In general, I cannot rely on the lookup() function. I wonder if you can provide any other insights.