gcoap: fix build with IPv4

sys/net/application_layer/gcoap/gcoap.c

@@ -53,7 +53,7 @@
 #define NO_IMMEDIATE_REPLY (-1)
 
 /* End of the range to pick a random timeout */
 #define TIMEOUT_RANGE_END ((uint32_t)CONFIG_COAP_ACK_TIMEOUT_MS * CONFIG_COAP_RANDOM_FACTOR_1000 / 1000)
 
 /* Internal functions */
 static void *_event_loop(void *arg);
@@ -399,7 +399,7 @@
         /* but store the header to keep the token for Observe notifications */
         memcpy(memo->msg.hdr_buf, hdr, sizeof(hdr));
         /* no further retransmissions should be made and
            gcoap_request_memo_get_hdr() has to know how to get the header for Observe notifications */
         memo->send_limit = GCOAP_SEND_LIMIT_NON;
     }
 }
@@ -958,11 +958,19 @@
         memo_pdu->hdr = gcoap_request_memo_get_hdr(memo);
 
         /* verbose debug to catch bugs with request/response matching */
+#if SOCK_HAS_IPV4
+        DEBUG("Seeking memo for remote=%s, tkn=0x%02x%02x%02x%02x%02x%02x%02x%02x, tkl=%"PRIuSIZE"\n",
+              ipv4_addr_to_str(_ipv6_addr_str, (ipv4_addr_t *)&remote->addr.ipv4,
+                               IPV6_ADDR_MAX_STR_LEN),
+              token[0], token[1], token[2], token[3], token[4], token[5], token[6], token[7],
+              tkl);
+#else
         DEBUG("Seeking memo for remote=%s, tkn=0x%02x%02x%02x%02x%02x%02x%02x%02x, tkl=%"PRIuSIZE"\n",
               ipv6_addr_to_str(_ipv6_addr_str, (ipv6_addr_t *)&remote->addr.ipv6,
                                IPV6_ADDR_MAX_STR_LEN),
               token[0], token[1], token[2], token[3], token[4], token[5], token[6], token[7],
               tkl);
+#endif
 
         if (coap_get_token_len(memo_pdu) != tkl) {
             DEBUG("Token length mismatch %u\n", coap_get_token_len(memo_pdu));
@@ -980,9 +988,15 @@
                 DEBUG("matching multicast response\n");
             }
             else {
+#if SOCK_HAS_IPV4
+                DEBUG("Remote address mismatch %s\n",
+                      ipv4_addr_to_str(_ipv6_addr_str, (ipv4_addr_t *)&memo->remote_ep.addr.ipv4,
+                                       IPV6_ADDR_MAX_STR_LEN));
+#else
                 DEBUG("Remote address mismatch %s\n",
                       ipv6_addr_to_str(_ipv6_addr_str, (ipv6_addr_t *)&memo->remote_ep.addr.ipv6,
                                        IPV6_ADDR_MAX_STR_LEN));
+#endif
                 continue;
             }
         }
@@ -1664,7 +1678,7 @@
     const coap_resource_t *resource = last_resource;
 
     while (listener) {
         if ((resource = _match_resource_path_iterator(listener, resource, (const uint8_t *)uri_path))) {
             *last_listener = listener;
             return resource;
         }
@@ -2091,4 +2105,4 @@
     event_post(&_queue, arg);
 }
 
 /** @} */