arduino_artnet_sample.ino

#include <ESP8266WiFi.h>
#include <WiFiUdp.h>

#define START_ADDR 1

#define SSID "***"
#define PASSWORD "***"

#define ART_NET_PORT 6454
#define ART_NET_ID "Art-Net\0"
#define ART_DMX_START 18
#define ART_DMX 0x5000

#define MAX_BUFFER_ARTNET 1024

static WiFiUDP Udp;

uint8_t artnetPacket[MAX_BUFFER_ARTNET];
uint16_t incomingUniverse;
uint16_t dmxDataLength;

uint8_t values[32];

void setup() {

  Serial.begin(115200);
  Serial.setTimeout(100);

  Serial1.begin(250000, SERIAL_8N2);

  //  WiFi.config(ip, gateway, subnet);
  WiFi.begin(SSID, PASSWORD);

  while ( WiFi.status() != WL_CONNECTED ) {
    delay(100);
    delay(100);
  }

  Udp.begin(ART_NET_PORT);

  Serial.println(WiFi.localIP());

}

void loop() {

  if ( WiFi.status() != WL_CONNECTED ) {
    delay(100);
    ESP.restart();
  }
  if (readArtnet() == ART_DMX)
  {
    // print out our data
    Serial.print("DMX data: ");
    for (int i = 0; i < 32; i++)
    {
      //Serial.print(artnet.getDmxFrame()[i]);
      values[i] = ( artnetPacket + ART_DMX_START )[i + START_ADDR - 1];

      Serial.print( values[i] );
      Serial.print("  ");
    }
    Serial.println();
    Serial.println();

  }

  delay(10);
  Serial1.flush();
  Serial1.begin(90000, SERIAL_8N2);
  while (Serial1.available()) Serial1.read();
  // send the break as a "slow" byte
  Serial1.write(0);
  // switch back to the original baud rate
  Serial1.flush();
  Serial1.begin(250000, SERIAL_8N2);
  while (Serial1.available()) Serial1.read();
  Serial1.write(0); // Start Code
  for (int i = 0; i < 32; i++) Serial1.write(values[i]);

}

uint16_t readArtnet() {

  uint16_t packetSize = Udp.parsePacket();

  if (packetSize <= MAX_BUFFER_ARTNET && packetSize > 0)
  {
    Udp.read(artnetPacket, MAX_BUFFER_ARTNET);

    // Check that packetID is "Art-Net" else ignore
    for (byte i = 0 ; i < 9 ; i++)
    {
      if (artnetPacket[i] != ART_NET_ID[i])
        return 0;
    }

    uint16_t opcode = artnetPacket[8] | artnetPacket[9] << 8;

    if (opcode == ART_DMX)
    {
      //sequence = artnetPacket[12];
      //incomingUniverse = artnetPacket[14] | artnetPacket[15] << 8;
      //dmxDataLength = artnetPacket[17] | artnetPacket[16] << 8;

      return ART_DMX;
    }
  }
  else
  {
    return 0;
  }

}