openthread: support 1.3 border routing features

- Support ICMPv6 auto config
- Support SRP service delegation
- Publish _meshcop._mdns service

examples/openthread/ot_br/README.md

@@ -146,3 +146,80 @@ I(552749) OPENTHREAD:[INFO]-UTIL----: Starting Child Supervision
 ```
 
 The device has now joined the same Thread network based on the key set by the commissioner.
+
+## Bidirectional IPv6 connectivity
+
+The border router will automatically publish the prefix and the route table rule to the WiFi network via ICMPv6 router advertisment packages.
+
+### Host configuration
+
+The automatically configure your host's route table rules you need to set these sysctl options:
+
+Please relace `wlan0` with the real name of your WiFi network interface.
+```
+sudo sysctl -w net/ipv6/conf/wlan0/accept_ra=2
+sudo sysctl -w net/ipv6/conf/wlan0/accept_ra_rt_info_max_plen=128
+```
+
+For mobile devices, the route table rules will be automatically configured after iOS 14 and Android 8.1.
+
+
+### Testing IPv6 connecitivity 
+
+Now in the joining device, check the IP addresses:
+
+```
+> ipaddr                                                              
+fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5
+fdde:ad00:beef:0:0:ff:fe00:c402                                       
+fdde:ad00:beef:0:ad4a:9a9a:3cd6:e423
+fe80:0:0:0:f011:2951:569e:9c4a                                        
+```
+
+You'll notice an IPv6 global prefix with only on address assigned under it. This is the routable address of this Thread node.
+You can ping this address on your host:
+
+``` bash
+$ ping fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5
+PING fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5(fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5) 56 data bytes
+64 bytes from fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5: icmp_seq=1 ttl=63 time=459 ms
+64 bytes from fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5: icmp_seq=2 ttl=63 time=109 ms
+64 bytes from fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5: icmp_seq=3 ttl=63 time=119 ms
+64 bytes from fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5: icmp_seq=4 ttl=63 time=117 ms
+```
+
+## Service discovery
+
+The newly introduced service registration protocol([SRP](https://datatracker.ietf.org/doc/html/draft-ietf-dnssd-srp-10)) allows devices in the Thread network to register a service. The border router will forward the service to the WiFi network via mDNS.
+
+Now we'll publish the service `my-service._test._udp` with hostname `test0` and port 12345
+
+```
+> srp client host name test0
+Done
+> srp client host address fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5
+Done
+> srp client service add my-service _test._udp 12345
+Done
+> srp client autostart enable
+Done
+```
+
+This service will also become visible on the WiFi network:
+
+```bash
+$ avahi-browse -r _test._udp -t   
+
++ enp1s0 IPv6 my-service                                    _test._udp           local
+= enp1s0 IPv6 my-service                                    _test._udp           local
+   hostname = [test0.local]
+   address = [fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5]
+   port = [12345]
+   txt = []
++ enp1s0 IPv4 my-service                                    _test._udp           local
+= enp1s0 IPv4 my-service                                    _test._udp           local
+   hostname = [test0.local]
+   address = [fde6:75ff:def4:3bc3:9e9e:3ef:4245:28b5]
+   port = [12345]
+   txt = []
+```

examples/openthread/ot_br/main/esp_ot_br.c

@@ -30,6 +30,7 @@
 #include "esp_ot_config.h"
 #include "esp_vfs_eventfd.h"
 #include "esp_wifi.h"
+#include "mdns.h"
 #include "nvs_flash.h"
 #include "protocol_examples_common.h"
 #include "sdkconfig.h"
@@ -109,18 +110,19 @@ static void create_config_network(otInstance *instance)
         abort();
     }
     dataset.mComponents.mIsExtendedPanIdPresent = true;
-    if (hex_string_to_binary(CONFIG_OPENTHREAD_NETWORK_MASTERKEY, dataset.mMasterKey.m8,
-                             sizeof(dataset.mMasterKey.m8)) != sizeof(dataset.mMasterKey.m8)) {
+    if (hex_string_to_binary(CONFIG_OPENTHREAD_NETWORK_MASTERKEY, dataset.mNetworkKey.m8,
+                             sizeof(dataset.mNetworkKey.m8)) != sizeof(dataset.mNetworkKey.m8)) {
         ESP_LOGE(TAG, "Cannot convert OpenThread master key. Please double-check your config.");
         abort();
     }
-    dataset.mComponents.mIsMasterKeyPresent = true;
+    dataset.mComponents.mIsNetworkKeyPresent = true;
     if (hex_string_to_binary(CONFIG_OPENTHREAD_NETWORK_PSKC, dataset.mPskc.m8, sizeof(dataset.mPskc.m8)) !=
             sizeof(dataset.mPskc.m8)) {
         ESP_LOGE(TAG, "Cannot convert OpenThread pre-shared commissioner key. Please double-check your config.");
         abort();
     }
     dataset.mComponents.mIsPskcPresent = true;
+    dataset.mComponents.mIsMeshLocalPrefixPresent = false;
     if (otDatasetSetActive(instance, &dataset) != OT_ERROR_NONE) {
         ESP_LOGE(TAG, "Failed to set OpenThread active dataset.");
         abort();
@@ -188,5 +190,7 @@ void app_main(void)
     ESP_ERROR_CHECK(esp_event_loop_create_default());
     ESP_ERROR_CHECK(example_connect());
     ESP_ERROR_CHECK(esp_wifi_set_ps(WIFI_PS_NONE));
+    ESP_ERROR_CHECK(mdns_init());
+    ESP_ERROR_CHECK(mdns_hostname_set("esp-ot-br"));
     xTaskCreate(ot_task_worker, "ot_br_main", 20480, xTaskGetCurrentTaskHandle(), 5, NULL);
 }

examples/openthread/ot_br/sdkconfig.defaults

@@ -36,6 +36,16 @@ CONFIG_OPENTHREAD_BORDER_ROUTER=y
 #
 # lwIP
 #
+CONFIG_LWIP_IPV6_FORWARD=y
 CONFIG_LWIP_IPV6_NUM_ADDRESSES=8
 CONFIG_LWIP_MULTICAST_PING=y
+CONFIG_LWIP_NETIF_STATUS_CALLBACK=y
+CONFIG_LWIP_HOOK_IP6_ROUTE_DEFAULT=y
+CONFIG_LWIP_HOOK_ND6_GET_GW_DEFAULT=y
 # end of lwIP
+
+#
+# mDNS
+#
+CONFIG_MDNS_STRICT_MODE=y
+# end of mDNS