245 lines
7.5 KiB
C
245 lines
7.5 KiB
C
/* MDNS-SD Query and advertise Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_system.h"
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#include "esp_wifi.h"
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#include "esp_event_loop.h"
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#include "esp_log.h"
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#include "nvs_flash.h"
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#include "mdns.h"
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#include "driver/gpio.h"
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#include <sys/socket.h>
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#include <netdb.h>
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/* The examples use simple WiFi configuration that you can set via
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'make menuconfig'.
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If you'd rather not, just change the below entries to strings with
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the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
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*/
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#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
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#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
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#define EXAMPLE_MDNS_HOSTNAME CONFIG_MDNS_HOSTNAME
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#define EXAMPLE_MDNS_INSTANCE CONFIG_MDNS_INSTANCE
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/* FreeRTOS event group to signal when we are connected & ready to make a request */
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static EventGroupHandle_t wifi_event_group;
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/* The event group allows multiple bits for each event,
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but we only care about one event - are we connected
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to the AP with an IP? */
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const int IP4_CONNECTED_BIT = BIT0;
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const int IP6_CONNECTED_BIT = BIT1;
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static const char *TAG = "mdns-test";
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static bool auto_reconnect = true;
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static esp_err_t event_handler(void *ctx, system_event_t *event)
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{
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switch(event->event_id) {
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case SYSTEM_EVENT_STA_START:
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esp_wifi_connect();
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break;
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case SYSTEM_EVENT_STA_CONNECTED:
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/* enable ipv6 */
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tcpip_adapter_create_ip6_linklocal(TCPIP_ADAPTER_IF_STA);
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break;
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case SYSTEM_EVENT_STA_GOT_IP:
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xEventGroupSetBits(wifi_event_group, IP4_CONNECTED_BIT);
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break;
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case SYSTEM_EVENT_AP_STA_GOT_IP6:
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xEventGroupSetBits(wifi_event_group, IP6_CONNECTED_BIT);
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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/* This is a workaround as ESP32 WiFi libs don't currently
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auto-reassociate. */
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if (auto_reconnect) {
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esp_wifi_connect();
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}
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xEventGroupClearBits(wifi_event_group, IP4_CONNECTED_BIT | IP6_CONNECTED_BIT);
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break;
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default:
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break;
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}
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mdns_handle_system_event(ctx, event);
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return ESP_OK;
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}
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static void initialise_wifi(void)
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{
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tcpip_adapter_init();
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wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
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ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = EXAMPLE_WIFI_SSID,
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.password = EXAMPLE_WIFI_PASS,
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},
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};
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ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
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ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
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ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
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ESP_ERROR_CHECK( esp_wifi_start() );
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}
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static void initialise_mdns(void)
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{
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//initialize mDNS
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ESP_ERROR_CHECK( mdns_init() );
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//set mDNS hostname (required if you want to advertise services)
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ESP_ERROR_CHECK( mdns_hostname_set(EXAMPLE_MDNS_HOSTNAME) );
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//set default mDNS instance name
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ESP_ERROR_CHECK( mdns_instance_name_set(EXAMPLE_MDNS_INSTANCE) );
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//structure with TXT records
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mdns_txt_item_t serviceTxtData[3] = {
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{"board","esp32"},
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{"u","user"},
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{"p","password"}
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};
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//initialize service
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ESP_ERROR_CHECK( mdns_service_add("ESP32-WebServer", "_http", "_tcp", 80, serviceTxtData, 3) );
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//add another TXT item
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ESP_ERROR_CHECK( mdns_service_txt_item_set("_http", "_tcp", "path", "/foobar") );
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//change TXT item value
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ESP_ERROR_CHECK( mdns_service_txt_item_set("_http", "_tcp", "u", "admin") );
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}
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static const char * if_str[] = {"STA", "AP", "ETH", "MAX"};
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static const char * ip_protocol_str[] = {"V4", "V6", "MAX"};
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static void mdns_print_results(mdns_result_t * results){
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mdns_result_t * r = results;
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mdns_ip_addr_t * a = NULL;
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int i = 1, t;
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while(r){
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printf("%d: Interface: %s, Type: %s\n", i++, if_str[r->tcpip_if], ip_protocol_str[r->ip_protocol]);
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if(r->instance_name){
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printf(" PTR : %s\n", r->instance_name);
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}
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if(r->hostname){
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printf(" SRV : %s.local:%u\n", r->hostname, r->port);
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}
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if(r->txt_count){
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printf(" TXT : [%u] ", r->txt_count);
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for(t=0; t<r->txt_count; t++){
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printf("%s=%s; ", r->txt[t].key, r->txt[t].value?r->txt[t].value:"NULL");
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}
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printf("\n");
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}
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a = r->addr;
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while(a){
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if(a->addr.type == MDNS_IP_PROTOCOL_V6){
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printf(" AAAA: " IPV6STR "\n", IPV62STR(a->addr.u_addr.ip6));
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} else {
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printf(" A : " IPSTR "\n", IP2STR(&(a->addr.u_addr.ip4)));
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}
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a = a->next;
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}
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r = r->next;
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}
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}
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static void query_mdns_service(const char * service_name, const char * proto)
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{
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ESP_LOGI(TAG, "Query PTR: %s.%s.local", service_name, proto);
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mdns_result_t * results = NULL;
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esp_err_t err = mdns_query_ptr(service_name, proto, 3000, 20, &results);
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if(err){
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ESP_LOGE(TAG, "Query Failed: %s", esp_err_to_name(err));
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return;
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}
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if(!results){
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ESP_LOGW(TAG, "No results found!");
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return;
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}
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mdns_print_results(results);
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mdns_query_results_free(results);
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}
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static void query_mdns_host(const char * host_name)
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{
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ESP_LOGI(TAG, "Query A: %s.local", host_name);
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struct ip4_addr addr;
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addr.addr = 0;
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esp_err_t err = mdns_query_a(host_name, 2000, &addr);
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if(err){
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if(err == ESP_ERR_NOT_FOUND){
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ESP_LOGW(TAG, "%s: Host was not found!", esp_err_to_name(err));
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return;
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}
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ESP_LOGE(TAG, "Query Failed: %s", esp_err_to_name(err));
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return;
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}
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ESP_LOGI(TAG, IPSTR, IP2STR(&addr));
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}
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static void initialise_button(void)
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{
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gpio_config_t io_conf;
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io_conf.intr_type = GPIO_PIN_INTR_DISABLE;
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io_conf.pin_bit_mask = 1;
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io_conf.mode = GPIO_MODE_INPUT;
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io_conf.pull_up_en = 1;
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io_conf.pull_down_en = 0;
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gpio_config(&io_conf);
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}
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static void check_button(void)
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{
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static bool old_level = true;
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bool new_level = gpio_get_level(GPIO_NUM_0);
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if (!new_level && old_level) {
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query_mdns_host("esp32");
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query_mdns_service("_arduino", "_tcp");
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query_mdns_service("_http", "_tcp");
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query_mdns_service("_printer", "_tcp");
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query_mdns_service("_ipp", "_tcp");
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query_mdns_service("_afpovertcp", "_tcp");
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query_mdns_service("_smb", "_tcp");
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query_mdns_service("_ftp", "_tcp");
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query_mdns_service("_nfs", "_tcp");
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}
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old_level = new_level;
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}
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static void mdns_example_task(void *pvParameters)
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{
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/* Wait for the callback to set the CONNECTED_BIT in the event group. */
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xEventGroupWaitBits(wifi_event_group, IP4_CONNECTED_BIT | IP6_CONNECTED_BIT,
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false, true, portMAX_DELAY);
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while(1) {
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check_button();
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vTaskDelay(50 / portTICK_PERIOD_MS);
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}
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}
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void app_main()
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{
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ESP_ERROR_CHECK( nvs_flash_init() );
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initialise_mdns();
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initialise_wifi();
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initialise_button();
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xTaskCreate(&mdns_example_task, "mdns_example_task", 2048, NULL, 5, NULL);
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}
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