Merge pull request #504 from gabsuren/mdns_1.2.4

bump(mdns): 1.2.3 -> 1.2.4

components/esp_websocket_client/examples/linux/README.md

@@ -0,0 +1,35 @@
+# ESP Websocket Client - Host Example
+
+This example demonstrates the ESP websocket client using the `linux` target. It allows for compilation and execution of the example directly within a Linux environment.
+
+## Compilation and Execution
+
+To compile and execute this example on Linux need to set target `linux`
+
+```
+idf.py --preview set-target linux
+idf.py build
+./websocket.elf
+```
+
+## Example Output
+
+```
+I (164532) websocket: [APP] Startup..
+I (164532) websocket: [APP] Free memory: 4294967295 bytes
+I (164532) websocket: [APP] IDF version: v5.3-dev-1353-gb3f7e2c8a4
+I (164538) websocket: Connecting to ws://echo.websocket.events...
+W (164538) websocket_client: `reconnect_timeout_ms` is not set, or it is less than or equal to zero, using default time out 10000 (milliseconds)
+W (164538) websocket_client: `network_timeout_ms` is not set, or it is less than or equal to zero, using default time out 10000 (milliseconds)
+I (165103) websocket: WEBSOCKET_EVENT_CONNECTED
+I (165539) websocket: Sending hello 0000
+I (165627) websocket: WEBSOCKET_EVENT_DATA
+I (165627) websocket: Received opcode=1
+W (165627) websocket: Received=hello 0000
+W (165627) websocket: Total payload length=10, data_len=10, current payload offset=0
+
+I (166539) websocket: Sending fragmented message
+```
+
+## Coverage Reporting
+For generating a coverage report, it's necessary to enable `CONFIG_GCOV_ENABLED=y` option. Set the following configuration in your project's SDK configuration file (`sdkconfig.ci.coverage`, `sdkconfig.ci.linux` or via `menuconfig`):

components/esp_websocket_client/examples/linux/main/idf_component.yml

@@ -1,3 +1,4 @@
 dependencies:
+  idf: ">5.2"
   protocol_examples_common:
     path: ${IDF_PATH}/examples/common_components/protocol_examples_common

components/esp_websocket_client/examples/linux/sdkconfig.ci.coverage

@@ -4,5 +4,3 @@ CONFIG_IDF_TARGET_LINUX=y
 CONFIG_ESP_EVENT_POST_FROM_ISR=n
 CONFIG_ESP_EVENT_POST_FROM_IRAM_ISR=n
 CONFIG_WEBSOCKET_URI="ws://echo.websocket.events"
-CONFIG_WEBSOCKET_URI_FROM_STRING=y
-CONFIG_WEBSOCKET_URI_FROM_STDIN=n

components/esp_websocket_client/examples/linux/sdkconfig.ci.linux

@@ -3,6 +3,3 @@ CONFIG_IDF_TARGET_LINUX=y
 CONFIG_ESP_EVENT_POST_FROM_ISR=n
 CONFIG_ESP_EVENT_POST_FROM_IRAM_ISR=n
 CONFIG_WEBSOCKET_URI="ws://echo.websocket.events"
-CONFIG_WEBSOCKET_URI_FROM_STRING=y
-CONFIG_WEBSOCKET_URI_FROM_STDIN=n
-CONFIG_EXAMPLE_CONNECT_WIFI=n

components/esp_websocket_client/examples/linux/sdkconfig.defaults

@@ -0,0 +1,5 @@
+CONFIG_IDF_TARGET="linux"
+CONFIG_IDF_TARGET_LINUX=y
+CONFIG_ESP_EVENT_POST_FROM_ISR=n
+CONFIG_ESP_EVENT_POST_FROM_IRAM_ISR=n
+CONFIG_WEBSOCKET_URI="ws://echo.websocket.events"

components/mdns/.cz.yaml

@@ -3,6 +3,6 @@ commitizen:
   bump_message: 'bump(mdns): $current_version -> $new_version'
   pre_bump_hooks: python ../../ci/changelog.py mdns
   tag_format: mdns-v$version
-  version: 1.2.3
+  version: 1.2.4
   version_files:
   - idf_component.yml

components/mdns/CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## [1.2.4](https://github.com/espressif/esp-protocols/commits/mdns-v1.2.4)
+
+### Bug Fixes
+
+- Correction on 6d2c475 MDNS_PREDEF_NETIF_ETH fix ([fc59f87c4e](https://github.com/espressif/esp-protocols/commit/fc59f87c4e))
+- fix the logic of creating pcb for networking socket ([5000a9a20a](https://github.com/espressif/esp-protocols/commit/5000a9a20a))
+- fix compiling issue when disabling IPv4 ([2646dcd23a](https://github.com/espressif/esp-protocols/commit/2646dcd23a))
+- Fix compile error when MDNS_PREDEF_NETIF_ETH is defined, but ETH_ENABLED is not (#459) ([6d2c475c20](https://github.com/espressif/esp-protocols/commit/6d2c475c20))
+
 ## [1.2.3](https://github.com/espressif/esp-protocols/commits/mdns-v1.2.3)
 
 ### Bug Fixes

components/mdns/examples/query_advertise/main/mdns_example_main.c

@@ -21,6 +21,12 @@
 #include "driver/gpio.h"
 #include "netdb.h"
 
+#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 1, 0)
+/* CONFIG_LWIP_IPV4 was introduced in IDF v5.1, set CONFIG_LWIP_IPV4 to 1 by default for IDF v5.0 */
+#ifndef CONFIG_LWIP_IPV4
+#define CONFIG_LWIP_IPV4 1
+#endif // CONFIG_LWIP_IPV4
+#endif // ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 1, 0)
 
 #define EXAMPLE_MDNS_INSTANCE CONFIG_MDNS_INSTANCE
 #define EXAMPLE_BUTTON_GPIO   CONFIG_MDNS_BUTTON_GPIO
@@ -227,7 +233,7 @@ static void query_mdns_hosts_async(const char *host_name)
         vTaskDelay(50 / portTICK_PERIOD_MS);
     }
 }
-
+#ifdef CONFIG_LWIP_IPV4
 static void query_mdns_host(const char *host_name)
 {
     ESP_LOGI(TAG, "Query A: %s.local", host_name);
@@ -247,6 +253,7 @@ static void query_mdns_host(const char *host_name)
 
     ESP_LOGI(TAG, "Query A: %s.local resolved to: " IPSTR, host_name, IP2STR(&addr));
 }
+#endif // CONFIG_LWIP_IPV4
 
 static void initialise_button(void)
 {
@@ -265,7 +272,9 @@ static void check_button(void)
     bool new_level = gpio_get_level(EXAMPLE_BUTTON_GPIO);
     if (!new_level && old_level) {
         query_mdns_hosts_async("esp32-mdns");
+#ifdef CONFIG_LWIP_IPV4
         query_mdns_host("esp32");
+#endif
         query_mdns_service("_arduino", "_tcp");
         query_mdns_service("_http", "_tcp");
         query_mdns_service("_printer", "_tcp");
@@ -286,7 +295,9 @@ static void mdns_example_task(void *pvParameters)
 {
 #if CONFIG_MDNS_RESOLVE_TEST_SERVICES == 1
     /* Send initial queries that are started by CI tester */
+#ifdef CONFIG_LWIP_IPV4
     query_mdns_host("tinytester");
+#endif
     query_mdns_host_with_gethostbyname("tinytester-lwip.local");
     query_mdns_host_with_getaddrinfo("tinytester-lwip.local");
 #endif
@@ -362,7 +373,16 @@ static void  query_mdns_host_with_gethostbyname(char *host)
     if (res) {
         unsigned int i = 0;
         while (res->h_addr_list[i] != NULL) {
-            ESP_LOGI(TAG, "gethostbyname: %s resolved to: %s", host, inet_ntoa(*(struct in_addr *) (res->h_addr_list[i])));
+            ESP_LOGI(TAG, "gethostbyname: %s resolved to: %s", host,
+#if defined(CONFIG_LWIP_IPV6) && defined(CONFIG_LWIP_IPV4)
+                     res->h_addrtype == AF_INET ? inet_ntoa(*(struct in_addr *) (res->h_addr_list[i])) :
+                     inet6_ntoa(*(struct in6_addr *) (res->h_addr_list[i]))
+#elif defined(CONFIG_LWIP_IPV6)
+                     inet6_ntoa(*(struct in6_addr *) (res->h_addr_list[i]))
+#else
+                     inet_ntoa(*(struct in_addr *) (res->h_addr_list[i]))
+#endif
+                    );
             i++;
         }
     }
@@ -384,10 +404,12 @@ static void  query_mdns_host_with_getaddrinfo(char *host)
     if (!getaddrinfo(host, NULL, &hints, &res)) {
         while (res) {
             char *resolved_addr;
-#if CONFIG_LWIP_IPV6
+#if defined(CONFIG_LWIP_IPV6) && defined(CONFIG_LWIP_IPV4)
             resolved_addr = res->ai_family == AF_INET ?
                             inet_ntoa(((struct sockaddr_in *) res->ai_addr)->sin_addr) :
-                            inet_ntoa(((struct sockaddr_in6 *) res->ai_addr)->sin6_addr);
+                            inet6_ntoa(((struct sockaddr_in6 *) res->ai_addr)->sin6_addr);
+#elif defined(CONFIG_LWIP_IPV6)
+            resolved_addr = inet6_ntoa(((struct sockaddr_in6 *) res->ai_addr)->sin6_addr);
 #else
             resolved_addr = inet_ntoa(((struct sockaddr_in *) res->ai_addr)->sin_addr);
 #endif // CONFIG_LWIP_IPV6

components/mdns/examples/query_advertise/pytest_mdns.py

@@ -87,26 +87,30 @@ def mdns_server(esp_host, events):
                 continue
             data, addr = sock.recvfrom(1024)
             dns = dpkt.dns.DNS(data)
-            if len(dns.qd) > 0 and dns.qd[0].type == dpkt.dns.DNS_A:
-                if dns.qd[0].name == TESTER_NAME:
-                    print('Received query: {} '.format(dns.__repr__()))
-                    sock.sendto(get_dns_answer_to_mdns(TESTER_NAME),
-                                (MCAST_GRP, UDP_PORT))
-                elif dns.qd[0].name == TESTER_NAME_LWIP:
-                    print('Received query: {} '.format(dns.__repr__()))
-                    sock.sendto(
-                        get_dns_answer_to_mdns_lwip(TESTER_NAME_LWIP, dns.id),
-                        addr)
-            if len(dns.an) > 0 and dns.an[0].type == dpkt.dns.DNS_A:
-                print('Received answer from {}'.format(dns.an[0].name))
-                if dns.an[0].name == esp_host + u'.local':
-                    print('Received answer to esp32-mdns query: {}'.format(
-                        dns.__repr__()))
-                    events['esp_answered'].set()
-                if dns.an[0].name == esp_host + u'-delegated.local':
-                    print('Received answer to esp32-mdns-delegate query: {}'.
-                          format(dns.__repr__()))
-                    events['esp_delegated_answered'].set()
+            if len(dns.qd) > 0:
+                for dns_query in dns.qd:
+                    if dns_query.type == dpkt.dns.DNS_A:
+                        if dns_query.name == TESTER_NAME:
+                            print('Received query: {} '.format(dns.__repr__()))
+                            sock.sendto(get_dns_answer_to_mdns(TESTER_NAME),
+                                        (MCAST_GRP, UDP_PORT))
+                        elif dns_query.name == TESTER_NAME_LWIP:
+                            print('Received query: {} '.format(dns.__repr__()))
+                            sock.sendto(
+                                get_dns_answer_to_mdns_lwip(TESTER_NAME_LWIP, dns.id),
+                                addr)
+            if len(dns.an) > 0:
+                for dns_answer in dns.an:
+                    if dns_answer.type == dpkt.dns.DNS_A:
+                        print('Received answer from {}'.format(dns_answer.name))
+                        if dns_answer.name == esp_host + u'.local':
+                            print('Received answer to esp32-mdns query: {}'.format(
+                                dns.__repr__()))
+                            events['esp_answered'].set()
+                        if dns_answer.name == esp_host + u'-delegated.local':
+                            print('Received answer to esp32-mdns-delegate query: {}'.format(
+                                dns.__repr__()))
+                            events['esp_delegated_answered'].set()
         except socket.timeout:
             break
         except dpkt.UnpackError:
@@ -133,62 +137,66 @@ def test_examples_protocol_mdns(dut):
     }
     mdns_responder = Thread(target=mdns_server,
                             args=(str(specific_host), mdns_server_events))
-    ipv4 = dut.expect(r'IPv4 address: (\d+\.\d+\.\d+\.\d+)[^\d]',
-                      timeout=30)[1].decode()
-    ip_addresses = [ipv4]
+    ip_addresses = []
+    if dut.app.sdkconfig.get('LWIP_IPV4') is True:
+        ipv4 = dut.expect(r'IPv4 address: (\d+\.\d+\.\d+\.\d+)[^\d]',
+                          timeout=30)[1].decode()
+        ip_addresses.append(ipv4)
     if dut.app.sdkconfig.get('LWIP_IPV6') is True:
         ipv6_r = r':'.join((r'[0-9a-fA-F]{4}', ) * 8)
         ipv6 = dut.expect(ipv6_r, timeout=30)[0].decode()
         ip_addresses.append(ipv6)
     print('Connected with IP addresses: {}'.format(','.join(ip_addresses)))
     try:
-        # 3. check the mdns name is accessible.
+        # TODO: Add test for example disabling IPV4
         mdns_responder.start()
-        if not mdns_server_events['esp_answered'].wait(timeout=30):
-            raise ValueError(
-                'Test has failed: did not receive mdns answer within timeout')
-        if not mdns_server_events['esp_delegated_answered'].wait(timeout=30):
-            raise ValueError(
-                'Test has failed: did not receive mdns answer for delegated host within timeout'
+        if dut.app.sdkconfig.get('LWIP_IPV4') is True:
+            # 3. check the mdns name is accessible.
+            if not mdns_server_events['esp_answered'].wait(timeout=30):
+                raise ValueError(
+                    'Test has failed: did not receive mdns answer within timeout')
+            if not mdns_server_events['esp_delegated_answered'].wait(timeout=30):
+                raise ValueError(
+                    'Test has failed: did not receive mdns answer for delegated host within timeout'
+                )
+            # 4. check DUT output if mdns advertized host is resolved
+            dut.expect(
+                re.compile(
+                    b'mdns-test: Query A: tinytester.local resolved to: 127.0.0.1')
             )
-        # 4. check DUT output if mdns advertized host is resolved
-        dut.expect(
-            re.compile(
-                b'mdns-test: Query A: tinytester.local resolved to: 127.0.0.1')
-        )
-        dut.expect(
-            re.compile(
-                b'mdns-test: gethostbyname: tinytester-lwip.local resolved to: 127.0.0.1'
-            ))
-        dut.expect(
-            re.compile(
-                b'mdns-test: getaddrinfo: tinytester-lwip.local resolved to: 127.0.0.1'
-            ))
-        # 5. check the DUT answers to `dig` command
-        dig_output = subprocess.check_output([
-            'dig', '+short', '-p', '5353', '@224.0.0.251',
-            '{}.local'.format(specific_host)
-        ])
-        print('Resolving {} using "dig" succeeded with:\n{}'.format(
-            specific_host, dig_output))
-        if not ipv4.encode('utf-8') in dig_output:
-            raise ValueError(
-                'Test has failed: Incorrectly resolved DUT hostname using dig'
-                "Output should've contained DUT's IP address:{}".format(ipv4))
-        # 6. check the DUT reverse lookup
-        if dut.app.sdkconfig.get('MDNS_RESPOND_REVERSE_QUERIES') is True:
-            for ip_address in ip_addresses:
-                dig_output = subprocess.check_output([
-                    'dig', '+short', '-p', '5353', '@224.0.0.251', '-x',
-                    '{}'.format(ip_address)
-                ])
-                print('Reverse lookup for {} using "dig" succeeded with:\n{}'.
-                      format(ip_address, dig_output))
-                if specific_host not in dig_output.decode():
-                    raise ValueError(
-                        'Test has failed: Incorrectly resolved DUT IP address using dig'
-                        "Output should've contained DUT's name:{}".format(
-                            specific_host))
+            dut.expect(
+                re.compile(
+                    b'mdns-test: gethostbyname: tinytester-lwip.local resolved to: 127.0.0.1'
+                ))
+            dut.expect(
+                re.compile(
+                    b'mdns-test: getaddrinfo: tinytester-lwip.local resolved to: 127.0.0.1'
+                ))
+            # 5. check the DUT answers to `dig` command
+            dig_output = subprocess.check_output([
+                'dig', '+short', '-p', '5353', '@224.0.0.251',
+                '{}.local'.format(specific_host)
+            ])
+            print('Resolving {} using "dig" succeeded with:\n{}'.format(
+                specific_host, dig_output))
+            if not ipv4.encode('utf-8') in dig_output:
+                raise ValueError(
+                    'Test has failed: Incorrectly resolved DUT hostname using dig'
+                    "Output should've contained DUT's IP address:{}".format(ipv4))
+            # 6. check the DUT reverse lookup
+            if dut.app.sdkconfig.get('MDNS_RESPOND_REVERSE_QUERIES') is True:
+                for ip_address in ip_addresses:
+                    dig_output = subprocess.check_output([
+                        'dig', '+short', '-p', '5353', '@224.0.0.251', '-x',
+                        '{}'.format(ip_address)
+                    ])
+                    print('Reverse lookup for {} using "dig" succeeded with:\n{}'.
+                          format(ip_address, dig_output))
+                    if specific_host not in dig_output.decode():
+                        raise ValueError(
+                            'Test has failed: Incorrectly resolved DUT IP address using dig'
+                            "Output should've contained DUT's name:{}".format(
+                                specific_host))
 
     finally:
         mdns_server_events['stop'].set()

components/mdns/examples/query_advertise/sdkconfig.ci.eth_no_ipv4

@@ -0,0 +1,15 @@
+CONFIG_IDF_TARGET="esp32"
+CONFIG_MDNS_RESOLVE_TEST_SERVICES=y
+CONFIG_MDNS_ADD_MAC_TO_HOSTNAME=y
+CONFIG_MDNS_PUBLISH_DELEGATE_HOST=y
+CONFIG_LWIP_DNS_SUPPORT_MDNS_QUERIES=y
+CONFIG_LWIP_IPV4=n
+CONFIG_EXAMPLE_CONNECT_ETHERNET=y
+CONFIG_EXAMPLE_CONNECT_WIFI=n
+CONFIG_EXAMPLE_USE_INTERNAL_ETHERNET=y
+CONFIG_EXAMPLE_ETH_PHY_IP101=y
+CONFIG_EXAMPLE_ETH_MDC_GPIO=23
+CONFIG_EXAMPLE_ETH_MDIO_GPIO=18
+CONFIG_EXAMPLE_ETH_PHY_RST_GPIO=5
+CONFIG_EXAMPLE_ETH_PHY_ADDR=1
+CONFIG_MDNS_BUTTON_GPIO=32

components/mdns/idf_component.yml

@@ -1,4 +1,4 @@
-version: "1.2.3"
+version: "1.2.4"
 description: mDNS
 url: https://github.com/espressif/esp-protocols/tree/master/components/mdns
 dependencies:

components/mdns/mdns.c

@@ -184,6 +184,11 @@ static inline void _mdns_clean_netif_ptr(mdns_if_t tcpip_if)
 static mdns_if_t _mdns_get_if_from_esp_netif(esp_netif_t *esp_netif)
 {
     for (int i = 0; i < MDNS_MAX_INTERFACES; ++i) {
+        // The predefined netifs in the static array are NULL when firstly calling this function
+        // if IPv4 is disabled. Set these netifs here.
+        if (s_esp_netifs[i].netif == NULL && s_esp_netifs[i].predefined) {
+            s_esp_netifs[i].netif = esp_netif_from_preset_if(s_esp_netifs[i].predef_if);
+        }
         if (esp_netif == s_esp_netifs[i].netif) {
             return i;
         }
@@ -1059,6 +1064,7 @@ static uint16_t _mdns_append_srv_record(uint8_t *packet, uint16_t *index, mdns_s
     return record_length;
 }
 
+#ifdef CONFIG_LWIP_IPV4
 /**
  * @brief  appends A record to a packet, incrementing the index
  *
@@ -1108,8 +1114,9 @@ static uint16_t _mdns_append_a_record(uint8_t *packet, uint16_t *index, const ch
     record_length += 4;
     return record_length;
 }
+#endif /* CONFIG_LWIP_IPV4 */
 
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
 /**
  * @brief  appends AAAA record to a packet, incrementing the index
  *
@@ -1232,7 +1239,7 @@ static bool _mdns_if_is_dup(mdns_if_t tcpip_if)
     return false;
 }
 
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
 /**
  * @brief  Check if IPv6 address is NULL
  */
@@ -1247,7 +1254,7 @@ static bool _ipv6_address_is_zero(esp_ip6_addr_t ip6)
     }
     return true;
 }
-#endif
+#endif /* CONFIG_LWIP_IPV6 */
 
 static uint8_t _mdns_append_host_answer(uint8_t *packet, uint16_t *index, mdns_host_item_t *host,
                                         uint8_t address_type, bool flush, bool bye)
@@ -1257,17 +1264,19 @@ static uint8_t _mdns_append_host_answer(uint8_t *packet, uint16_t *index, mdns_h
 
     while (addr != NULL) {
         if (addr->addr.type == address_type) {
+#ifdef CONFIG_LWIP_IPV4
             if (address_type == ESP_IPADDR_TYPE_V4 &&
                     _mdns_append_a_record(packet, index, host->hostname, addr->addr.u_addr.ip4.addr, flush, bye) <= 0) {
                 break;
             }
-#if CONFIG_LWIP_IPV6
+#endif /* CONFIG_LWIP_IPV4 */
+#ifdef CONFIG_LWIP_IPV6
             if (address_type == ESP_IPADDR_TYPE_V6 &&
                     _mdns_append_aaaa_record(packet, index, host->hostname, (uint8_t *)addr->addr.u_addr.ip6.addr, flush,
                                              bye) <= 0) {
                 break;
             }
-#endif // CONFIG_LWIP_IPV6
+#endif /* CONFIG_LWIP_IPV6 */
             num_records++;
         }
         addr = addr->next;
@@ -1360,7 +1369,9 @@ static uint8_t _mdns_append_answer(uint8_t *packet, uint16_t *index, mdns_out_an
         return _mdns_append_txt_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
     } else if (answer->type == MDNS_TYPE_SDPTR) {
         return _mdns_append_sdptr_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
-    } else if (answer->type == MDNS_TYPE_A) {
+    }
+#ifdef CONFIG_LWIP_IPV4
+    else if (answer->type == MDNS_TYPE_A) {
         if (answer->host == &_mdns_self_host) {
             esp_netif_ip_info_t if_ip_info;
             if (!mdns_is_netif_ready(tcpip_if, MDNS_IP_PROTOCOL_V4) && _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].state != PCB_DUP) {
@@ -1387,7 +1398,8 @@ static uint8_t _mdns_append_answer(uint8_t *packet, uint16_t *index, mdns_out_an
             return _mdns_append_host_answer(packet, index, answer->host, ESP_IPADDR_TYPE_V4, answer->flush, answer->bye);
         }
     }
-#if CONFIG_LWIP_IPV6
+#endif /* CONFIG_LWIP_IPV4 */
+#ifdef CONFIG_LWIP_IPV6
     else if (answer->type == MDNS_TYPE_AAAA) {
         if (answer->host == &_mdns_self_host) {
             struct esp_ip6_addr if_ip6s[NETIF_IPV6_MAX_NUMS];
@@ -1425,7 +1437,7 @@ static uint8_t _mdns_append_answer(uint8_t *packet, uint16_t *index, mdns_out_an
                                             answer->bye);
         }
     }
-#endif
+#endif /* CONFIG_LWIP_IPV6 */
     return 0;
 }
 
@@ -1713,12 +1725,14 @@ static mdns_tx_packet_t *_mdns_alloc_packet_default(mdns_if_t tcpip_if, mdns_ip_
     packet->tcpip_if = tcpip_if;
     packet->ip_protocol = ip_protocol;
     packet->port = MDNS_SERVICE_PORT;
+#ifdef CONFIG_LWIP_IPV4
     if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
         esp_ip_addr_t addr = ESP_IP4ADDR_INIT(224, 0, 0, 251);
         memcpy(&packet->dst, &addr, sizeof(esp_ip_addr_t));
     }
-#if CONFIG_LWIP_IPV6
-    else {
+#endif
+#ifdef CONFIG_LWIP_IPV6
+    if (ip_protocol == MDNS_IP_PROTOCOL_V6) {
         esp_ip_addr_t addr = ESP_IP6ADDR_INIT(0x000002ff, 0, 0, 0xfb000000);
         memcpy(&packet->dst, &addr, sizeof(esp_ip_addr_t));
     }
@@ -2877,6 +2891,7 @@ static void _mdns_dup_interface(mdns_if_t tcpip_if)
     }
 }
 
+#ifdef CONFIG_LWIP_IPV4
 /**
  * @brief  Detect IPv4 address collision
  */
@@ -2890,7 +2905,6 @@ static int _mdns_check_a_collision(esp_ip4_addr_t *ip, mdns_if_t tcpip_if)
     if (esp_netif_get_ip_info(_mdns_get_esp_netif(tcpip_if), &if_ip_info)) {
         return 1;//they win
     }
-
     int ret = memcmp((uint8_t *)&if_ip_info.ip.addr, (uint8_t *)&ip->addr, sizeof(esp_ip4_addr_t));
     if (ret > 0) {
         return -1;//we win
@@ -2911,8 +2925,9 @@ static int _mdns_check_a_collision(esp_ip4_addr_t *ip, mdns_if_t tcpip_if)
     }
     return 0;//same
 }
+#endif /* CONFIG_LWIP_IPV4 */
 
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
 /**
  * @brief  Detect IPv6 address collision
  */
@@ -2946,7 +2961,7 @@ static int _mdns_check_aaaa_collision(esp_ip6_addr_t *ip, mdns_if_t tcpip_if)
     }
     return 0;//same
 }
-#endif
+#endif /* CONFIG_LWIP_IPV6 */
 
 static bool _hostname_is_ours(const char *hostname)
 {
@@ -3509,22 +3524,25 @@ void mdns_parse_packet(mdns_rx_packet_t *packet)
 
 #ifndef CONFIG_MDNS_SKIP_SUPPRESSING_OWN_QUERIES
     // Check if the packet wasn't sent by us
+#ifdef CONFIG_LWIP_IPV4
     if (packet->ip_protocol == MDNS_IP_PROTOCOL_V4) {
         esp_netif_ip_info_t if_ip_info;
         if (esp_netif_get_ip_info(_mdns_get_esp_netif(packet->tcpip_if), &if_ip_info) == ESP_OK &&
                 memcmp(&if_ip_info.ip.addr, &packet->src.u_addr.ip4.addr, sizeof(esp_ip4_addr_t)) == 0) {
             return;
         }
-#if CONFIG_LWIP_IPV6
-    } else {
+    }
+#endif /* CONFIG_LWIP_IPV4 */
+#ifdef CONFIG_LWIP_IPV6
+    if (packet->ip_protocol == MDNS_IP_PROTOCOL_V6) {
         struct esp_ip6_addr if_ip6;
         if (esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(packet->tcpip_if), &if_ip6) == ESP_OK &&
                 memcmp(&if_ip6, &packet->src.u_addr.ip6, sizeof(esp_ip6_addr_t)) == 0) {
             return;
         }
-#endif
     }
-#endif
+#endif /* CONFIG_LWIP_IPV6 */
+#endif // CONFIG_MDNS_SKIP_SUPPRESSING_OWN_QUERIES
 
     // Check for the minimum size of mdns packet
     if (len <=  MDNS_HEAD_ADDITIONAL_OFFSET) {
@@ -3887,7 +3905,7 @@ void mdns_parse_packet(mdns_rx_packet_t *packet)
                 }
 
             }
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
             else if (type == MDNS_TYPE_AAAA) {//ipv6
                 esp_ip_addr_t ip6;
                 ip6.type = ESP_IPADDR_TYPE_V6;
@@ -3940,7 +3958,8 @@ void mdns_parse_packet(mdns_rx_packet_t *packet)
                 }
 
             }
-#endif
+#endif /* CONFIG_LWIP_IPV6 */
+#ifdef CONFIG_LWIP_IPV4
             else if (type == MDNS_TYPE_A) {
                 esp_ip_addr_t ip;
                 ip.type = ESP_IPADDR_TYPE_V4;
@@ -3993,6 +4012,7 @@ void mdns_parse_packet(mdns_rx_packet_t *packet)
                 }
 
             }
+#endif /* CONFIG_LWIP_IPV4 */
         }
         //end while
         if (parsed_packet->authoritative) {
@@ -4094,6 +4114,7 @@ static void perform_event_action(mdns_if_t mdns_if, mdns_event_actions_t action)
     }
 
 #ifdef CONFIG_MDNS_RESPOND_REVERSE_QUERIES
+#ifdef CONFIG_LWIP_IPV4
     if (action & MDNS_EVENT_IP4_REVERSE_LOOKUP) {
         esp_netif_ip_info_t if_ip_info;
         if (esp_netif_get_ip_info(_mdns_get_esp_netif(mdns_if), &if_ip_info) == ESP_OK) {
@@ -4107,7 +4128,7 @@ static void perform_event_action(mdns_if_t mdns_if, mdns_event_actions_t action)
             }
         }
     }
-
+#endif /* CONFIG_LWIP_IPV4 */
 #ifdef CONFIG_LWIP_IPV6
     if (action & MDNS_EVENT_IP6_REVERSE_LOOKUP) {
         esp_ip6_addr_t addr6;
@@ -5483,22 +5504,25 @@ esp_err_t mdns_init(void)
 #endif
 
     uint8_t i;
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
     esp_ip6_addr_t tmp_addr6;
 #endif
+#ifdef CONFIG_LWIP_IPV4
     esp_netif_ip_info_t if_ip_info;
+#endif
 
     for (i = 0; i < MDNS_MAX_INTERFACES; i++) {
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
         if (!esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(i), &tmp_addr6) && !_ipv6_address_is_zero(tmp_addr6)) {
             _mdns_enable_pcb(i, MDNS_IP_PROTOCOL_V6);
         }
 #endif
+#ifdef CONFIG_LWIP_IPV4
         if (!esp_netif_get_ip_info(_mdns_get_esp_netif(i), &if_ip_info) && if_ip_info.ip.addr) {
             _mdns_enable_pcb(i, MDNS_IP_PROTOCOL_V4);
         }
+#endif
     }
-
     if (_mdns_service_task_start()) {
         //service start failed!
         err = ESP_FAIL;
@@ -6468,6 +6492,7 @@ esp_err_t mdns_lookup_selfhosted_service(const char *instance, const char *servi
     return ESP_OK;
 }
 
+#ifdef CONFIG_LWIP_IPV4
 esp_err_t mdns_query_a(const char *name, uint32_t timeout, esp_ip4_addr_t *addr)
 {
     mdns_result_t *result = NULL;
@@ -6504,8 +6529,9 @@ esp_err_t mdns_query_a(const char *name, uint32_t timeout, esp_ip4_addr_t *addr)
     mdns_query_results_free(result);
     return ESP_ERR_NOT_FOUND;
 }
+#endif /* CONFIG_LWIP_IPV4 */
 
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
 esp_err_t mdns_query_aaaa(const char *name, uint32_t timeout, esp_ip6_addr_t *addr)
 {
     mdns_result_t *result = NULL;
@@ -6542,7 +6568,7 @@ esp_err_t mdns_query_aaaa(const char *name, uint32_t timeout, esp_ip6_addr_t *ad
     mdns_query_results_free(result);
     return ESP_ERR_NOT_FOUND;
 }
-#endif
+#endif /* CONFIG_LWIP_IPV6 */
 
 #ifdef MDNS_ENABLE_DEBUG
 

components/mdns/mdns_console.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -8,6 +8,7 @@
 #include "esp_console.h"
 #include "argtable3/argtable3.h"
 #include "mdns.h"
+#include "mdns_private.h"
 
 static const char *ip_protocol_str[] = {"V4", "V6", "MAX"};
 
@@ -50,6 +51,7 @@ static struct {
     struct arg_end *end;
 } mdns_query_a_args;
 
+#ifdef CONFIG_LWIP_IPV4
 static int cmd_mdns_query_a(int argc, char **argv)
 {
     int nerrors = arg_parse(argc, argv, (void **) &mdns_query_a_args);
@@ -106,8 +108,9 @@ static void register_mdns_query_a(void)
 
     ESP_ERROR_CHECK( esp_console_cmd_register(&cmd_init) );
 }
+#endif /* CONFIG_LWIP_IPV4 */
 
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
 static int cmd_mdns_query_aaaa(int argc, char **argv)
 {
     int nerrors = arg_parse(argc, argv, (void **) &mdns_query_a_args);
@@ -164,7 +167,7 @@ static void register_mdns_query_aaaa(void)
 
     ESP_ERROR_CHECK( esp_console_cmd_register(&cmd_init) );
 }
-#endif
+#endif /* CONFIG_LWIP_IPV6 */
 
 static struct {
     struct arg_str *instance;
@@ -1042,8 +1045,10 @@ void mdns_console_register(void)
     register_mdns_service_txt_remove();
     register_mdns_service_remove_all();
 
+#ifdef CONFIG_LWIP_IPV4
     register_mdns_query_a();
-#if CONFIG_LWIP_IPV6
+#endif
+#ifdef CONFIG_LWIP_IPV6
     register_mdns_query_aaaa();
 #endif
     register_mdns_query_txt();

components/mdns/mdns_networking_lwip.c

@@ -96,6 +96,7 @@ static esp_err_t _udp_join_group(mdns_if_t if_inx, mdns_ip_protocol_t ip_protoco
     netif = esp_netif_get_netif_impl(tcpip_if);
     assert(netif);
 
+#if LWIP_IPV4
     if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
         ip4_addr_t multicast_addr;
         IP4_ADDR(&multicast_addr, 224, 0, 0, 251);
@@ -110,21 +111,22 @@ static esp_err_t _udp_join_group(mdns_if_t if_inx, mdns_ip_protocol_t ip_protoco
             }
         }
     }
-#if CONFIG_LWIP_IPV6
-    else {
+#endif // LWIP_IPV4
+#if LWIP_IPV6
+    if (ip_protocol == MDNS_IP_PROTOCOL_V6) {
         ip_addr_t multicast_addr = IPADDR6_INIT(0x000002ff, 0, 0, 0xfb000000);
 
         if (join) {
-            if (mld6_joingroup_netif(netif, &(multicast_addr.u_addr.ip6))) {
+            if (mld6_joingroup_netif(netif, ip_2_ip6(&multicast_addr))) {
                 return ESP_ERR_INVALID_STATE;
             }
         } else {
-            if (mld6_leavegroup_netif(netif, &(multicast_addr.u_addr.ip6))) {
+            if (mld6_leavegroup_netif(netif, ip_2_ip6(&multicast_addr))) {
                 return ESP_ERR_INVALID_STATE;
             }
         }
     }
-#endif
+#endif // LWIP_IPV6
     return ESP_OK;
 }
 
@@ -152,29 +154,34 @@ static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip
         packet->tcpip_if = MDNS_MAX_INTERFACES;
         packet->pb = this_pb;
         packet->src_port = rport;
-#if CONFIG_LWIP_IPV6
+#if LWIP_IPV4 && LWIP_IPV6
         packet->src.type = raddr->type;
         memcpy(&packet->src.u_addr, &raddr->u_addr, sizeof(raddr->u_addr));
-#else
+#elif LWIP_IPV4
         packet->src.type = IPADDR_TYPE_V4;
-        memcpy(&packet->src.u_addr.ip4, &raddr->addr, sizeof(ip_addr_t));
+        packet->src.u_addr.ip4.addr = raddr->addr;
+#elif LWIP_IPV6
+        packet->src.type = IPADDR_TYPE_V6;
+        memcpy(&packet->src.u_addr.ip6, raddr, sizeof(ip_addr_t));
 #endif
         packet->dest.type = packet->src.type;
 
+#if LWIP_IPV4
         if (packet->src.type == IPADDR_TYPE_V4) {
             packet->ip_protocol = MDNS_IP_PROTOCOL_V4;
             struct ip_hdr *iphdr = (struct ip_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP_HLEN);
             packet->dest.u_addr.ip4.addr = iphdr->dest.addr;
             packet->multicast = ip4_addr_ismulticast(&(packet->dest.u_addr.ip4));
         }
-#if CONFIG_LWIP_IPV6
-        else {
+#endif // LWIP_IPV4
+#if LWIP_IPV6
+        if (packet->src.type == IPADDR_TYPE_V6) {
             packet->ip_protocol = MDNS_IP_PROTOCOL_V6;
             struct ip6_hdr *ip6hdr = (struct ip6_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP6_HLEN);
             memcpy(&packet->dest.u_addr.ip6.addr, (uint8_t *)ip6hdr->dest.addr, 16);
             packet->multicast = ip6_addr_ismulticast(&(packet->dest.u_addr.ip6));
         }
-#endif
+#endif // LWIP_IPV6
 
         //lwip does not return the proper pcb if you have more than one for the same multicast address (but different interfaces)
         struct netif *netif = NULL;
@@ -182,15 +189,14 @@ static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip
         for (i = 0; i < MDNS_MAX_INTERFACES; i++) {
             netif = esp_netif_get_netif_impl(_mdns_get_esp_netif(i));
             if (s_interfaces[i].proto && netif && netif == ip_current_input_netif ()) {
+#if LWIP_IPV4
                 if (packet->src.type == IPADDR_TYPE_V4) {
-#if CONFIG_LWIP_IPV6
-                    if ((packet->src.u_addr.ip4.addr & netif->netmask.u_addr.ip4.addr) != (netif->ip_addr.u_addr.ip4.addr & netif->netmask.u_addr.ip4.addr)) {
-#else
-                    if ((packet->src.u_addr.ip4.addr & netif->netmask.addr) != (netif->ip_addr.addr & netif->netmask.addr)) {
-#endif                  //packet source is not in the same subnet
+                    if ((packet->src.u_addr.ip4.addr & ip_2_ip4(&netif->netmask)->addr) != (ip_2_ip4(&netif->ip_addr)->addr & ip_2_ip4(&netif->netmask)->addr)) {
+                        //packet source is not in the same subnet
                         break;
                     }
                 }
+#endif // LWIP_IPV4
                 packet->tcpip_if = i;
                 found = true;
                 break;
@@ -347,12 +353,17 @@ size_t _mdns_udp_pcb_write(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, c
     memcpy((uint8_t *)pbt->payload, data, len);
 
     ip_addr_t ip_add_copy;
-#if CONFIG_LWIP_IPV6
+#if LWIP_IPV6 && LWIP_IPV4
     ip_add_copy.type = ip->type;
     memcpy(&(ip_add_copy.u_addr), &(ip->u_addr), sizeof(ip_add_copy.u_addr));
-#else
-    memcpy(&(ip_add_copy.addr), &(ip->u_addr), sizeof(ip_add_copy.addr));
-#endif // CONFIG_LWIP_IPV6
+#elif LWIP_IPV4
+    ip_add_copy.addr = ip->u_addr.ip4.addr;
+#elif LWIP_IPV6
+#if LWIP_IPV6_SCOPES
+    ip_add_copy.zone = ip->u_addr.ip6.zone;
+#endif // LWIP_IPV6_SCOPES
+    memcpy(ip_add_copy.addr, ip->u_addr.ip6.addr, sizeof(ip_add_copy.addr));
+#endif
 
     mdns_api_call_t msg = {
         .tcpip_if = tcpip_if,

components/mdns/mdns_networking_socket.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -138,11 +138,13 @@ static inline char *get_string_address(struct sockaddr_storage *source_addr)
     static char address_str[40]; // 40=(8*4+7+term) is the max size of ascii IPv6 addr "XXXX:XX...XX:XXXX"
     char *res = NULL;
     // Convert ip address to string
+#ifdef CONFIG_LWIP_IPV4
     if (source_addr->ss_family == PF_INET) {
         res = inet_ntoa_r(((struct sockaddr_in *)source_addr)->sin_addr, address_str, sizeof(address_str));
     }
+#endif
 #ifdef CONFIG_LWIP_IPV6
-    else if (source_addr->ss_family == PF_INET6) {
+    if (source_addr->ss_family == PF_INET6) {
         res = inet6_ntoa_r(((struct sockaddr_in6 *)source_addr)->sin6_addr, address_str, sizeof(address_str));
     }
 #endif
@@ -157,6 +159,7 @@ static inline size_t espaddr_to_inet(const esp_ip_addr_t *addr, const uint16_t p
 {
     size_t ss_addr_len = 0;
     memset(in_addr, 0, sizeof(struct sockaddr_storage));
+#ifdef CONFIG_LWIP_IPV4
     if (ip_protocol == MDNS_IP_PROTOCOL_V4 && addr->type == ESP_IPADDR_TYPE_V4) {
         in_addr->ss_family = PF_INET;
 #if !defined(CONFIG_IDF_TARGET_LINUX)
@@ -167,8 +170,9 @@ static inline size_t espaddr_to_inet(const esp_ip_addr_t *addr, const uint16_t p
         in_addr_ip4->sin_port = port;
         in_addr_ip4->sin_addr.s_addr = addr->u_addr.ip4.addr;
     }
-#if CONFIG_LWIP_IPV6
-    else if (ip_protocol == MDNS_IP_PROTOCOL_V6 && addr->type == ESP_IPADDR_TYPE_V6) {
+#endif // CONFIG_LWIP_IPV4
+#ifdef CONFIG_LWIP_IPV6
+    if (ip_protocol == MDNS_IP_PROTOCOL_V6 && addr->type == ESP_IPADDR_TYPE_V6) {
         memset(in_addr, 0, sizeof(struct sockaddr_storage));
         in_addr->ss_family = PF_INET6;
 #if !defined(CONFIG_IDF_TARGET_LINUX)
@@ -212,6 +216,7 @@ size_t _mdns_udp_pcb_write(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, c
 
 static inline void inet_to_espaddr(const struct sockaddr_storage *in_addr, esp_ip_addr_t *addr, uint16_t *port)
 {
+#ifdef CONFIG_LWIP_IPV4
     if (in_addr->ss_family == PF_INET) {
         struct sockaddr_in *in_addr_ip4 = (struct sockaddr_in *)in_addr;
         memset(addr, 0, sizeof(esp_ip_addr_t));
@@ -219,8 +224,9 @@ static inline void inet_to_espaddr(const struct sockaddr_storage *in_addr, esp_i
         addr->u_addr.ip4.addr = in_addr_ip4->sin_addr.s_addr;
         addr->type = ESP_IPADDR_TYPE_V4;
     }
-#if CONFIG_LWIP_IPV6
-    else if (in_addr->ss_family == PF_INET6) {
+#endif /* CONFIG_LWIP_IPV4 */
+#ifdef CONFIG_LWIP_IPV6
+    if (in_addr->ss_family == PF_INET6) {
         struct sockaddr_in6 *in_addr_ip6 = (struct sockaddr_in6 *)in_addr;
         memset(addr, 0, sizeof(esp_ip_addr_t));
         *port = in_addr_ip6->sin6_port;
@@ -346,17 +352,9 @@ static bool create_pcb(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
     }
     int sock = s_interfaces[tcpip_if].sock;
     esp_netif_t *netif = _mdns_get_esp_netif(tcpip_if);
-    if (sock >= 0) {
-        mdns_ip_protocol_t other_ip_proto = ip_protocol == MDNS_IP_PROTOCOL_V4 ? MDNS_IP_PROTOCOL_V6 : MDNS_IP_PROTOCOL_V4;
-        int err = join_mdns_multicast_group(sock, netif, other_ip_proto);
-        if (err < 0) {
-            ESP_LOGE(TAG, "Failed to add ipv6 multicast group for protocol %d", ip_protocol);
-            return false;
-        }
-        s_interfaces[tcpip_if].proto |= (other_ip_proto == MDNS_IP_PROTOCOL_V4 ? PROTO_IPV4 : PROTO_IPV6);
-        return true;
+    if (sock < 0) {
+        sock = create_socket(netif);
     }
-    sock = create_socket(netif);
     if (sock < 0) {
         ESP_LOGE(TAG, "Failed to create the socket!");
         return false;
@@ -383,7 +381,7 @@ esp_err_t _mdns_pcb_init(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
 
 static int create_socket(esp_netif_t *netif)
 {
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
     int sock = socket(PF_INET6, SOCK_DGRAM, 0);
 #else
     int sock = socket(PF_INET, SOCK_DGRAM, 0);
@@ -398,7 +396,7 @@ static int create_socket(esp_netif_t *netif)
         ESP_LOGE(TAG, "Failed setsockopt() to set SO_REUSEADDR. errno=%d: %s\n", errno, strerror(errno));
     }
     // Bind the socket to any address
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
     struct sockaddr_in6 saddr = { INADDR_ANY };
     saddr.sin6_family = AF_INET6;
     saddr.sin6_port = htons(5353);
@@ -434,7 +432,7 @@ err:
     return -1;
 }
 
-#if CONFIG_LWIP_IPV6
+#ifdef CONFIG_LWIP_IPV6
 static int socket_add_ipv6_multicast_group(int sock, esp_netif_t *netif)
 {
     int ifindex = esp_netif_get_netif_impl_index(netif);
@@ -457,6 +455,7 @@ static int socket_add_ipv6_multicast_group(int sock, esp_netif_t *netif)
 }
 #endif // CONFIG_LWIP_IPV6
 
+#ifdef CONFIG_LWIP_IPV4
 static int socket_add_ipv4_multicast_group(int sock, esp_netif_t *netif)
 {
     struct ip_mreq imreq = { 0 };
@@ -481,13 +480,16 @@ static int socket_add_ipv4_multicast_group(int sock, esp_netif_t *netif)
 err:
     return err;
 }
+#endif // CONFIG_LWIP_IPV4
 
 static int join_mdns_multicast_group(int sock, esp_netif_t *netif, mdns_ip_protocol_t ip_protocol)
 {
+#ifdef CONFIG_LWIP_IPV4
     if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
         return socket_add_ipv4_multicast_group(sock, netif);
     }
-#if CONFIG_LWIP_IPV6
+#endif // CONFIG_LWIP_IPV4
+#ifdef CONFIG_LWIP_IPV6
     if (ip_protocol == MDNS_IP_PROTOCOL_V6) {
         return socket_add_ipv6_multicast_group(sock, netif);
     }

components/mdns/private_include/mdns_private.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -39,6 +39,14 @@
 #define NETIF_IPV6_MAX_NUMS 3
 #endif
 
+#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 1, 0)
+/* CONFIG_LWIP_IPV4 was introduced in IDF v5.1 */
+/* For IDF v5.0, set CONFIG_LWIP_IPV4 to 1 by default */
+#ifndef CONFIG_LWIP_IPV4
+#define CONFIG_LWIP_IPV4 1
+#endif // CONFIG_LWIP_IPV4
+#endif // ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 1, 0)
+
 /** Number of configured interfaces */
 #if MDNS_MAX_PREDEF_INTERFACES > CONFIG_MDNS_MAX_INTERFACES
 #warning Number of configured interfaces is less then number of predefined interfaces. Please update CONFIG_MDNS_MAX_INTERFACES.

components/mdns/tests/host_test/components/esp_netif_linux/Kconfig

@@ -6,4 +6,10 @@ menu "LWIP-MOCK-CONFIG"
         help
             Enable/disable IPv6
 
+    config LWIP_IPV4
+        bool "Enable IPv4"
+        default y
+        help
+            Enable/disable IPv4
+
 endmenu

examples/README.md

@@ -0,0 +1,22 @@
+# Examples
+
+## Overview
+
+This directory showcases a variety of examples, illustrating the use of different interfaces and functionalities. Navigate through these examples to understand how to implement and integrate various components and features in your projects.
+
+## Detailed Examples
+
+1. **Multiple Network Interfaces Example**: Demonstrates the integration and management of multiple network interfaces.
+   Location: [multiple_netifs](esp_netif/multiple_netifs)
+
+2. **SLIP Device Client**: Provides a detailed example of a SLIP (Serial Line Internet Protocol) device client implementation.
+   Location: [slip_custom_netif](esp_netif/slip_custom_netif/)
+
+3. **MQTT Demo on Linux**: A comprehensive demonstration of an MQTT (Message Queuing Telemetry Transport) application designed to run on a Linux environment.
+   Location: [mqtt](mqtt)
+
+## Additional Resources and Examples
+
+For an extensive collection of additional examples, especially those related to specific components, please visit the upper layer directory and navigate to the respective component's example directory.
+
+**Important**: To explore more, check the path: `components/*component_name/examples`