Multicasting spectrum bytes from MSGEQ7 to multiple clients

gistfile1.txt

//Server part
//UDPSend
#include <WiFiUdp.h>

WiFiUDP Udp;
IPAddress ipMulti(239, 0, 0, 57); //Our multicast group
unsigned int localUdpPort = 4210; //Our port
char  spectrumUDP[7]; //Just define it
//Setup part
Udp.begin(localUdpPort);
//Loop part
//When get given frequency from MSGEQ - just assign it to corresponding specUdp..
 spectrumValue[i] = analogRead(MSGEQ7_AUDIO_PIN);
 spectrumUDP[i] = spectrumValue[i] / 4;
//For now you have filled all the udp array with specBytes will send them in one packet
// My advice is to keep some delay between packets - 50-150packets per seconds is reasonable (fps)
EVERY_N_MILLISECONDS(20){
Udp.beginPacketMulticast(ipMulti, 4210, WiFi.localIP(),1); //1 is TTL - it is ok for local networks !
Udp.write(spectrumUDP, 7);
//Serial.printf("%i | %i | %i | %i | %i | %i | %i \n",spectrumUDP[0],spectrumUDP[1],spectrumUDP[2],spectrumUDP[3],spectrumUDP[4],spectrumUDP[5],spectrumUDP[6]);
Udp.endPacket();
}

//Receiver part

#include <WiFiUdp.h>
WiFiUDP Udp;
IPAddress ipMulti(239, 0, 0, 57);
unsigned int localUdpPort = 4210;
unsigned int spectrumUDP[7];
#define BUFFER_LEN 1024
char incomingPacket[BUFFER_LEN];
//Setup part
Udp.beginMulticast(WiFi.localIP(), ipMulti, localUdpPort);
//Loop
void readAudio() {
 int packetSize = Udp.parsePacket();
if (packetSize)
{
 int len = Udp.read(incomingPacket, BUFFER_LEN);
  if (len > 0)
{
  for (int i = 0; i < 7; i++) {
uint8_t reading=max((int)incomingPacket[i],1);
    spectrumUDP[i] = reading;
     spectrumValue[i] = map(spectrumUDP[i],1,255,0,1023);
  }
}}}