/*
* ESP8266 UART <-> WiFi(UDP) <-> UART
Bridge
* ESP8266 TX of Serial1 is GPIO2
*/
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <ESP8266mDNS.h>
const char* ssid = "**********";
const char* password = "**********";
WiFiUDP Udp;
unsigned int localUdpPort = 4210; // local port to
listen on
char incomingPacket[255]; // buffer for incoming
packets
#define bufferSize 8192
uint8_t buf[bufferSize];
uint8_t iofs=0;
IPAddress remoteIp;
unsigned int remotePort;
char myHostName[16] = {0};
char remoteHostName[16] = {0};
void setup()
{
delay(1000);
Serial1.begin(115200);
Serial.begin(9600);
sprintf(myHostName, "ESP_%06X", ESP.getChipId());
Serial1.print("myHostName: ");
Serial1.println(myHostName);
WiFi.hostname(myHostName);
Serial1.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial1.print(".");
}
Serial1.println(" connected");
Udp.begin(localUdpPort);
Serial1.printf("Now listening at IP %s, UDP port
%d\n", WiFi.localIP().toString().c_str(), localUdpPort);
// Start the mDNS responder for ESP_XXXXXX.local
if (!MDNS.begin(myHostName)) {
Serial1.println("Error setting up MDNS
responder!");
}
Serial1.println("mDNS responder started");
// Announce esp8266_wifi udp service on port 4210
MDNS.addService("esp8266_wifi", "udp",
localUdpPort);
}
void loop()
{
static int validRemoteIp = 0;
int packetSize = Udp.parsePacket();
if (packetSize)
{
// receive incoming UDP packets
Serial1.printf("Received %d bytes from
%s, port %d\n", packetSize,
Udp.remoteIP().toString().c_str(), Udp.remotePort());
int len = Udp.read(incomingPacket,
255);
if (len > 0)
{
incomingPacket[len] = 0;
}
Serial1.printf("UDP packet contents:
%s\n", incomingPacket);
Serial.print(incomingPacket);
}
if(Serial.available()) {
while(1) {
if(Serial.available()) {
buf[iofs] =
(char)Serial.read(); // read char from UART
if(iofs<bufferSize-1) {
iofs++;
}
} else {
break;
}
}
if (validRemoteIp == 0) {
// Send out query for
esp8266_wifi udp services
Serial1.println("Sending
mDNS query");
int n =
MDNS.queryService("esp8266_wifi", "udp");
Serial1.println("mDNS query
done");
if (n == 0) {
Serial1.println("no services found");
} else {
Serial1.print(n);
Serial1.println(" service(s) found");
for (int i = 0;
i < n; ++i) {
//
Print details for each service found
Serial1.print(i + 1);
Serial1.print(": ");
Serial1.print(MDNS.hostname(i));
Serial1.print(" (");
Serial1.print(MDNS.IP(i));
Serial1.print(":");
Serial1.print(MDNS.port(i));
Serial1.println(")");
MDNS.hostname(i).toCharArray(remoteHostName,
sizeof(remoteHostName));
if
(strcmp(remoteHostName, myHostName) != 0) {
remoteIp = MDNS.IP(i);
remotePort = MDNS.port(i);
validRemoteIp = 1;
}
}
}
Serial1.println();
Serial1.print("remoteIp=");
Serial1.println(remoteIp);
Serial1.print("remotePort=");
Serial1.println(remotePort);
}
Serial1.print("validRemoteIp=");
Serial1.println(validRemoteIp);
if (validRemoteIp) {
Udp.beginPacket(remoteIp,
remotePort); // remote IP and port
Udp.write(buf, iofs);
Udp.endPacket();
}
iofs = 0;
}
}
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