# OpenThread Border Router Example ## Overview This example demonstrates an [OpenThread border router](https://openthread.io/guides/border-router). ## How to use example ### Hardware Required The following SoCs are required to run this example: * An ESP32 series Wi-Fi SoC (ESP32, ESP32-C, ESP32-S, etc) loaded with this ot_br example. * An ESP32-H2 802.15.4 SoC loaded with [ot_rcp](../ot_rcp) example. * Another ESP32-H2 SoC loaded with [ot_cli](../ot_cli) example. Enable `OPENTHREAD_JOINER` option in menuconfig before compiling the example. Connect the two SoCs via UART, below is an example setup with ESP32 DevKitC and ESP32-H2 DevKitC: ![thread_br](image/thread-border-router-esp32-esp32h2.jpg) ESP32 pin | ESP32-H2 pin ----------|------------- GND | G GPIO4 | TX GPIO5 | RX ### Configure the project ``` idf.py menuconfig ``` You need to configure the `CONFIG_EXAMPLE_WIFI_SSID` and `CONFIG_EXAMPLE_WIFI_PASSWORD` with your access point's ssid and psk. ### Build, Flash, and Run Build the project and flash it to the board, then run monitor tool to view serial output: ``` idf.py -p PORT build flash monitor ``` ## Example Output ```bash I (2729) esp_netif_handlers: example_connect: sta ip: 192.168.1.100, mask: 255.255.255.0, gw: 192.168.1.1 I (2729) example_connect: Got IPv4 event: Interface "example_connect: sta" address: 192.168.1.100 I (3729) example_connect: Got IPv6 event: Interface "example_connect: sta" address: fe80:0000:0000:0000:266f:28ff:fe80:2920, type: ESP_IP6_ADDR_IS_LINK_LOCAL I (3729) example_connect: Connected to example_connect: sta I (3739) example_connect: - IPv4 address: 192.168.1.100 I (3739) example_connect: - IPv6 address: fe80:0000:0000:0000:266f:28ff:fe80:2920, type: ESP_IP6_ADDR_IS_LINK_LOCAL ...... I(8139) OPENTHREAD:[INFO]-MLE-----: AttachState ParentReqReeds -> Idle I(8139) OPENTHREAD:[NOTE]-MLE-----: Allocate router id 50 I(8139) OPENTHREAD:[NOTE]-MLE-----: RLOC16 fffe -> c800 I(8159) OPENTHREAD:[NOTE]-MLE-----: Role Detached -> Leader ``` The device will automatically connect to the configured Wi-Fi and Thread network and act as the border router. ## Using the border agent feature You need to ot-commissioner on the host machine and another Thread end device running OpenThread cli. You can find the guide to build and run ot-commissioner [here](https://openthread.io/guides/commissioner/build). Make sure to configure the same PSKc as the one in sdkconfig in ot-commisioner's config file `non-ccm-config.json` ### Connect the commissioner to the border router Note that the target address `192.168.1.100` shall match the actual Wi-Fi IP address of the device. `49154` is a port number used by the OT commissioner. ``` bash $ commissioner-cli /usr/local/etc/commissioner/non-ccm-config.json > start 192.168.1.100 49154 [done] > active true [done] ``` You can also verify the commissioner connection from the border router's log: ``` I(59709) OPENTHREAD:[INFO]-MESH-CP-: DTLS started I(65469) OPENTHREAD:[INFO]-MESH-CP-: Commissioner connected I(65479) OPENTHREAD:[INFO]-MESH-CP-: Forwarded request to leader on c/lp I(65489) OPENTHREAD:[INFO]-MESH-CP-: received petition I(65489) OPENTHREAD:[INFO]-MESH-CP-: sent petition response I(65489) OPENTHREAD:[INFO]-MESH-CP-: commissioner accepted: session ID=3077, ALOC=fd04:b642:9ba9:fcdc:0:ff:fe00:fc35 I(65499) OPENTHREAD:[INFO]-MESH-CP-: Sent to commissioner I(65509) OPENTHREAD:[INFO]-CORE----: Notifier: StateChanged (0x00000201) [Ip6+ NetData] I(65529) OPENTHREAD:[INFO]-BBR-----: PBBR state: None I(65539) OPENTHREAD:[INFO]-BBR-----: Domain Prefix: ::/0, state: None I(65559) OPENTHREAD:[INFO]-MESH-CP-: Forwarded request to leader on c/ag W(65559) OPENTHREAD:[WARN]-MESH-CP-: Failed to notify commissioner on ProxyRx (c/ur): DestinationAddressFiltered I(65579) OPENTHREAD:[INFO]-MESH-CP-: sent active dataset get response to fd04:b642:9ba9:fcdc:0:ff:fe00:c800 W(65579) OPENTHREAD:[WARN]-MESH-CP-: Failed to notify commissioner on ProxyRx (c/ur): DestinationAddressFiltered I(65589) OPENTHREAD:[INFO]-MESH-CP-: Sent to commissioner I(65629) OPENTHREAD:[INFO]-MESH-CP-: Forwarded request to leader on c/ag W(65629) OPENTHREAD:[WARN]-MESH-CP-: Failed to notify commissioner on ProxyRx (c/ur): DestinationAddressFiltered I(65649) OPENTHREAD:[INFO]-MESH-CP-: sent active dataset get response to fd04:b642:9ba9:fcdc:0:ff:fe00:c800 W(65649) OPENTHREAD:[WARN]-MESH-CP-: Failed to notify commissioner on ProxyRx (c/ur): DestinationAddressFiltered I(65659) OPENTHREAD:[INFO]-MESH-CP-: Sent to commissioner I(65689) OPENTHREAD:[INFO]-MESH-CP-: Proxy transmit sent to fd04:b642:9ba9:fcdc:0:ff:fe00:fc00 W(65689) OPENTHREAD:[WARN]-MESH-CP-: Failed to notify commissioner on ProxyRx (c/ur): DestinationAddressFiltered I(65699) OPENTHREAD:[INFO]-MESH-CP-: sent pending dataset get response to fd04:b642:9ba9:fcdc:0:ff:fe00:fc35 I(65709) OPENTHREAD:[INFO]-MESH-CP-: Sent to commissioner on c/ur I(65749) OPENTHREAD:[INFO]-MESH-CP-: Proxy transmit sent to fd04:b642:9ba9:fcdc:0:ff:fe00:fc00 W(65749) OPENTHREAD:[WARN]-MESH-CP-: Failed to notify commissioner on ProxyRx (c/ur): DestinationAddressFiltered I(65759) OPENTHREAD:[INFO]-MESH-CP-: sent commissioning dataset set response I(65769) OPENTHREAD:[INFO]-MESH-CP-: Sent to commissioner on c/ur I(65769) OPENTHREAD:[INFO]-CORE----: Notifier: StateChanged (0x00000200) [NetData] I(65789) OPENTHREAD:[INFO]-BBR-----: PBBR state: None ``` ### Commission the joiner In the OT commissioner cli, run: ``` bash > joiner enableall meshcop J01NU5 [done] > ``` In the joining device's cli, run: ```bash > ifconfig up Done > joiner start J01NU5 Done > Join success! > thread start Done ``` You can also find these log lines in the border router: ``` I(531219) OPENTHREAD:[INFO]-MESH-CP-: Received relay transmit I(531229) OPENTHREAD:[INFO]-MESH-CP-: Received kek I(531279) OPENTHREAD:[INFO]-MAC-----: Sent IPv6 UDP msg, len:85, chksum:14a0, to:92335c4b320830fb, sec:no, prio:net I(531279) OPENTHREAD:[INFO]-MAC-----: src:[fe80:0:0:0:ac2f:720a:6fe4:c837]:1000 I(531289) OPENTHREAD:[INFO]-MAC-----: dst:[fe80:0:0:0:9033:5c4b:3208:30fb]:1000 I(531299) OPENTHREAD:[INFO]-MESH-CP-: Sending JOIN_ENT.ntf I(531299) OPENTHREAD:[INFO]-MESH-CP-: Sent joiner entrust length = 161 ...... I(552699) OPENTHREAD:[INFO]-MLE-----: Receive Child ID Request (fe80:0:0:0:8434:c5ec:fe9f:c088) I(552729) OPENTHREAD:[INFO]-CORE----: [settings] Added ChildInfo {rloc:0xc801, extaddr:8634c5ecfe9fc088, timeout:240, mode:0x0f, version:3} I(552729) OPENTHREAD:[INFO]-MLE-----: Send Child ID Response (fe80:0:0:0:8434:c5ec:fe9f:c088,0xc801) I(552739) OPENTHREAD:[INFO]-CORE----: Notifier: StateChanged (0x00000400) [Child+] 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 Wi-Fi network via ICMPv6 router advertisement packages. ### Host configuration The automatically configure your host's route table rules you need to set these sysctl options: Please replace `wlan0` with the real name of your Wi-Fi 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 connectivity 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 Wi-Fi 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 Wi-Fi 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 = [] ```