/*
ESP8266 mDNS-SD responder and query sample
This is an example of announcing and finding
services.
Instructions:
- Update WiFi SSID and password as necessary.
- Flash the sketch to two ESP8266 boards
- The last one powered on should now find the
other.
*/
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
const char* ssid = "MyAP";
const char* password = "";
char myDomainName[16] = {0};
char remoteDomainName[16] = {0};
IPAddress localIp;
IPAddress remoteIp;
unsigned int remotePort;
unsigned long lastQueryService = 0;
WiFiUDP Udp;
unsigned int localPort = 4210; // local port to
listen on
void setup() {
delay(1000);
Serial.begin(115200);
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println(" connected");
Serial.println("WiFi connected");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
Serial.print("subnetMask: ");
Serial.println(WiFi.subnetMask());
Serial.print("gatewayIP: ");
Serial.println(WiFi.gatewayIP());
localIp = WiFi.localIP();
Udp.begin(localPort);
//Serial.printf("Now listening at IP %s, UDP port
%d\n", WiFi.localIP().toString().c_str(), localUdpPort);
Serial.print("Now listening at IP :");
Serial.print(localIp);
Serial.print(" UDP port :");
Serial.println(localPort);
sprintf(myDomainName, "ESP_%06X", ESP.getChipId());
Serial.print("myDomainName: ");
Serial.println(myDomainName);
// Set up mDNS responder:
// - first argument is the domain name, in this
example
// the fully-qualified domain name is
"esp8266.local"
// - second argument is the IP address to advertise
// we send our IP address on the WiFi
network
if (!MDNS.begin(myDomainName)) {
Serial.println("Error setting up MDNS
responder!");
while(1) {}
}
Serial.println("mDNS responder started");
// Announce esp tcp service on port 8080
MDNS.addService("esp8266_wifi", "udp", localPort);
}
void loop() {
MDNS.update();
unsigned long now = millis();
if (now - lastQueryService > 5000) { // 5秒経過
lastQueryService = now;
// Send out query for esp tcp services
Serial.println("Sending mDNS query");
int n =
MDNS.queryService("esp8266_wifi", "udp");
Serial.println("mDNS query done");
if (n == 0) {
Serial.println("no services
found");
} else {
Serial.print(n);
Serial.println(" service(s)
found");
for (int i = 0; i < n;
++i) {
// Print
details for each service found
Serial.print(i
+ 1);
Serial.print(":
");
Serial.print(MDNS.hostname(i));
Serial.print("
(");
Serial.print(MDNS.IP(i));
Serial.print(":");
Serial.print(MDNS.port(i));
Serial.println(")");
MDNS.hostname(i).toCharArray(remoteDomainName,
sizeof(remoteDomainName));
if
(strcmp(remoteDomainName, myDomainName) != 0) {
remoteIp = MDNS.IP(i);
remotePort = MDNS.port(i);
Serial.print("localIp=");
Serial.print(localIp);
Serial.print(" localPort=");
Serial.print(localPort);
Serial.print(" remoteIp=");
Serial.print(remoteIp);
Serial.print(" remotePort=");
Serial.println(remotePort);
}
}
}
Serial.println();
}
}
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