ESP8266 Community Forum

- Tue Aug 15, 2017 11:58 am #69091 Don't add it if you don't want it.

sprintf(HostName, "MyESPAP");

- Tue Aug 15, 2017 12:48 pm #69092 The question is : does it work !!
In my configuration it doesn't !!!

Don't add it if you don't want it.

sprintf(HostName, "MyESPAP");

- Wed Aug 16, 2017 11:51 am #69138 Yes, it works ...

- Thu Aug 17, 2017 12:37 pm #69191 Hi marinayotte !

Do you see my mistake ?
Never had such problems with a simple program :

#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <WiFiClient.h>

const char* ssid = "********";
const char* password = "*********";
char hostString[16] = {0};

// TCP server at port 80 will respond to HTTP requests
WiFiServer server(80);

void setup(void)
{
Serial.begin(115200);
sprintf(hostString, "ESP_%06X", ESP.getChipId());
Serial.print("Hostname: ");
Serial.println(hostString);
WiFi.hostname(hostString);

// 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());


if (!MDNS.begin(hostString)) {
Serial.println("Error setting up MDNS responder!");
while(1) {
delay(1000);
}
}
Serial.println("mDNS responder started");

// Start TCP (HTTP) server
server.begin();
Serial.println("TCP server started");

// Add service to MDNS-SD
MDNS.addService("http", "tcp", 80);
}

What do you mean "not working" ?

Does your router shows that ESP3 hostname in the IP leases list ?

Don't expect to be able to do "ping ESP3", it won't work since the DNS doesn't know this hostname.
Use mDNS service on your ESP, install Bonjour on Windows, and then "ESP3.local" will be resolved.