Setting the MDNS host name in CHIP (CON-1257)
jonsmirl opened this issue · comments
The MDNS host name is set here:
https://github.com/project-chip/connectedhomeip/blob/master/src/platform/ESP32/ESP32DnssdImpl.cpp#L164
if (strcmp(service->mHostName, "") != 0)
{
VerifyOrExit(mdns_hostname_set(service->mHostName) == ESP_OK, error = CHIP_ERROR_INTERNAL);
}
Is there some way I can pass in my own host names so that they don't get set to string like this? 1C53F9E795FE.local, DC5475EFA5BC.local, 98F4AB76D1E4.local, etc...
Related question, how can I add my own MDNS service in a way which doesn't stomp on CHIP?
You can try to use the function mdns_delegate_hostname_add and mdns_service_add_for_host to add a new host and service. Note that you should obtain all the addresses of the network interface and pass the addresses when adding the host.
This seems to work...
esp_netif_t *intf = esp_netif_get_default_netif();
char *delegated_hostname;
if (-1 == asprintf(&delegated_hostname, "lowpan-%d", nodeId)) {
abort();
}
mdns_ip_addr_t addr4, addr6;
addr4.addr.type = ESP_IPADDR_TYPE_V4;
esp_netif_ip_info_t info;
esp_netif_get_ip_info(intf, &info);
addr4.addr.u_addr.ip4 = info.ip;
addr6.addr.type = ESP_IPADDR_TYPE_V6;
esp_netif_get_ip6_linklocal(intf, &addr6.addr.u_addr.ip6);
addr4.next = &addr6;
addr6.next = NULL;
ESP_ERROR_CHECK( mdns_delegate_hostname_add(delegated_hostname, &addr4) );
ESP_ERROR_CHECK( mdns_service_add_for_host(NULL, "_http", "_tcp", delegated_hostname, 80, NULL, 0) );
free(delegated_hostname);
