Thanks John: I started with the mDNS Webserver example in the arduino ide, and added in the code from your reference.
I've posted it below in case it helps others.
I wonder if you could have a look at it for me please as it reports as follows:
.....
Connected to TALK~~~~~~~
IP address: 192.168.1.49
TCP server started
Query A: esp32-mdns.localHost was not found!
Query A: esp32.localHost was not found!
1: Interface: STA, Type: V4
PTR : D-Link DHP-W610AV Configuration Utility
SRV : dlinkap.local:80
AAAA: fe80:0000:0000:0000:7a32:1bff:fec6:dda9
A : 192.168.1.36
New client
Request: /
Sending 200
Done with client
yet it does connect at http://esp32.local/ and give this message: Hello from ESP32 at 192.168.1.49
[code]
/*
ESP32 mDNS responder sample
This is an example of an HTTP server that is accessible
via http://esp32.local URL thanks to mDNS responder.
Instructions:
- Update WiFi SSID and password as necessary.
- Flash the sketch to the ESP32 board
- Install host software:
- For Linux, install Avahi (http://avahi.org/).
- For Windows, install Bonjour (http://www.apple.com/support/bonjour/).
- For Mac OSX and iOS support is built in through Bonjour already.
- Point your browser to http://esp32.local, you should see a response.
*/
/*
* additional function examples from
* https://espressif.github.io/esp-protocols/mdns/en/index.html
*/
#include <WiFi.h>
#include <ESPmDNS.h>
#include <WiFiClient.h>
const char* ssid = "TALK~~~~~~"; // Enter SSID here
const char* password = "********"; //Enter Password here
// TCP server at port 80 will respond to HTTP requests
WiFiServer server(80);
//Example method to start mDNS for the STA interface and set hostname and default_instance:
void start_mdns_service()
{
//initialize mDNS service
esp_err_t err = mdns_init();
if (err) {
printf("MDNS Init failed: %d\n", err);
return;
}
//set hostname
mdns_hostname_set("esp32"); //changed from my-esp32 to esp32
//set default instance
mdns_instance_name_set("John's ESP32 mDNSThing");
}
//Example method to add a few services and different properties:
void add_mdns_services()
{
//add our services
mdns_service_add(NULL, "_http", "_tcp", 80, NULL, 0);
mdns_service_add(NULL, "_arduino", "_tcp", 3232, NULL, 0);
mdns_service_add(NULL, "_myservice", "_udp", 1234, NULL, 0);
//NOTE: services must be added before their properties can be set
//use custom instance for the web server
mdns_service_instance_name_set("_http", "_tcp", "John's ESP32 Web Server");
mdns_txt_item_t serviceTxtData[3] = {
{"board","{esp32}"},
{"u","user"},
{"p","password"}
};
//set txt data for service (will free and replace current data)
mdns_service_txt_set("_http", "_tcp", serviceTxtData, 3);
//change service port
mdns_service_port_set("_myservice", "_udp", 4321);
}
//Example method to resolve host IPs:
void resolve_mdns_host(const char * host_name)
{
printf("Query A: %s.local", host_name);
struct ip4_addr addr;
addr.addr = 0;
esp_err_t err = mdns_query_a(host_name, 2000, &addr);
if(err){
if(err == ESP_ERR_NOT_FOUND){
printf("Host was not found!\n");
return;
}
printf("Query Failed");
return;
}
printf(IPSTR, IP2STR(&addr));
}
//Example method to resolve local services:
static const char * if_str[] = {"STA", "AP", "ETH", "MAX"};
static const char * ip_protocol_str[] = {"V4", "V6", "MAX"};
void mdns_print_results(mdns_result_t * results){
mdns_result_t * r = results;
mdns_ip_addr_t * a = NULL;
int i = 1, t;
while(r){
printf("%d: Interface: %s, Type: %s\n", i++, if_str[r->tcpip_if], ip_protocol_str[r->ip_protocol]);
if(r->instance_name){
printf(" PTR : %s\n", r->instance_name);
}
if(r->hostname){
printf(" SRV : %s.local:%u\n", r->hostname, r->port);
}
if(r->txt_count){
printf(" TXT : [%u] ", r->txt_count);
for(t=0; t<r->txt_count; t++){
printf("%s=%s; ", r->txt[t].key, r->txt[t].value);
}
printf("\n");
}
a = r->addr;
while(a){
if(a->addr.type == IPADDR_TYPE_V6){
printf(" AAAA: " IPV6STR "\n", IPV62STR(a->addr.u_addr.ip6));
} else {
printf(" A : " IPSTR "\n", IP2STR(&(a->addr.u_addr.ip4)));
}
a = a->next;
}
r = r->next;
}
}
void find_mdns_service(const char * service_name, const char * proto)
{
ESP_LOGI(TAG, "Query PTR: %s.%s.local", service_name, proto);
mdns_result_t * results = NULL;
esp_err_t err = mdns_query_ptr(service_name, proto, 3000, 20, &results);
if(err){
ESP_LOGE(TAG, "Query Failed");
return;
}
if(!results){
ESP_LOGW(TAG, "No results found!");
return;
}
mdns_print_results(results);
mdns_query_results_free(results);
}
//Example of using the methods above:
void my_app_some_method(){
//search for esp32-mdns.local
resolve_mdns_host("esp32-mdns");
//search for esp32.local
resolve_mdns_host("esp32");
//search for HTTP servers
find_mdns_service("_http", "_tcp");
//or file servers
find_mdns_service("_smb", "_tcp"); //windows sharing
find_mdns_service("_afpovertcp", "_tcp"); //apple sharing
find_mdns_service("_nfs", "_tcp"); //NFS server
find_mdns_service("_ftp", "_tcp"); //FTP server
//or networked printer
find_mdns_service("_printer", "_tcp");
find_mdns_service("_ipp", "_tcp");
}
void setup(void)
{
Serial.begin(115200);
// Connect to WiFi network
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
/*
// Set up mDNS responder:
// - first argument is the domain name, in this example
// the fully-qualified domain name is "esp32.local"
// - second argument is the IP address to advertise
// we send our IP address on the WiFi network
if (!MDNS.begin("esp32")) {
Serial.println("Error setting up MDNS responder!");
while(1) {
delay(1000);
}
}
Serial.println("mDNS responder started");
*/
//Example method to start mDNS for the STA interface and set hostname and default_instance:
start_mdns_service();
// Start TCP (HTTP) server
server.begin();
Serial.println("TCP server started");
// Add service to MDNS-SD
//MDNS.addService("http", "tcp", 80);
add_mdns_services();
my_app_some_method();
}
void loop(void)
{
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
Serial.println("");
Serial.println("New client");
// Wait for data from client to become available
while(client.connected() && !client.available()){
delay(1);
}
// Read the first line of HTTP request
String req = client.readStringUntil('\r');
// First line of HTTP request looks like "GET /path HTTP/1.1"
// Retrieve the "/path" part by finding the spaces
int addr_start = req.indexOf(' ');
int addr_end = req.indexOf(' ', addr_start + 1);
if (addr_start == -1 || addr_end == -1) {
Serial.print("Invalid request: ");
Serial.println(req);
return;
}
req = req.substring(addr_start + 1, addr_end);
Serial.print("Request: ");
Serial.println(req);
String s;
if (req == "/")
{
IPAddress ip = WiFi.localIP();
String ipStr = String(ip[0]) + '.' + String(ip[1]) + '.' + String(ip[2]) + '.' + String(ip[3]);
s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>Hello from ESP32 at ";
s += ipStr;
s += "</html>\r\n\r\n";
Serial.println("Sending 200");
}
else
{
s = "HTTP/1.1 404 Not Found\r\n\r\n";
Serial.println("Sending 404");
}
client.print(s);
client.stop();
Serial.println("Done with client");
}
[/code]
