No multicast UDP packets are received when I2S is active

[JPMJPM]

Hi,

I am using board "NodeMCU 1.0 (ESP-12E Module)" 2.6.2

Without i2s_begin(); there is not multicast UDP packet loss.
With i2s_begin(); no multicast UDP packets are received.

Any clue ?. Thanks.

Code :

WiFiUDP Udp;
IPAddress multicastIPaddress(224,1,1,3);
unsigned int localUdpPort = 6000;
char incomingPacket[1500];
int packetSize;

void setup() {
Udp.beginMulticast(WiFi.localIP(), multicastIPaddress, localUdpPort);
i2s_begin();
}

void loop() {
packetSize = Udp.parsePacket();
if (packetSize) {
int len = Udp.read(incomingPacket, packetSize);
Serial.printf("len = %d\n", len);
}
}

[gibo77]

Hi,
How did you make your multicast work?
I could not make it work and my program is already bare bones.
`
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include "user_interface.h"

WiFiUDP Udp;
IPAddress multicastIPaddress(224,1,1,3);
unsigned int localUdpPort = 4210; // local port to listen on
char incomingPacket[255]; // buffer for incoming packets
//char replyPacket[] = "Hi there! Got the message :-)"; // a reply string to send back

void setup()
{
Serial.begin(115200);
Serial.println();

WiFi.mode(WIFI_STA); delay(1000);
WiFi.begin();
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println(" connected");

wifi_set_sleep_type(NONE_SLEEP_T);
delay(1000);
Udp.beginMulticast(WiFi.localIP(), multicastIPaddress, localUdpPort);
Serial.printf("Now listening...");
}

void loop()
{
int packetSize = Udp.parsePacket();
yield();
if (packetSize)
{
// receive incoming UDP packets
Serial.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;
}
Serial.printf("UDP packet contents: %s\n", incomingPacket);

}
}`

[earlephilhower]

I just ran the test given on master and had no difficulty when running the UDP multicast sender example on https://gist.github.com/hostilefork/f7cae3dc33e7416f2dd25a402857b6c6

#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <i2s.h>

WiFiUDP Udp;
IPAddress multicastIPaddress(224,1,1,3);
unsigned int localUdpPort = 6000;
char incomingPacket[1500];
int packetSize;

void setup() {
  Serial.begin(115200);
  delay(3000);
  Serial.printf("\nUDP begin\n");
  Serial.println(multicastIPaddress);
  Serial.println(localUdpPort);
  Udp.beginMulticast(WiFi.localIP(), multicastIPaddress, localUdpPort);
  i2s_begin();
}

void loop() {
  packetSize = Udp.parsePacket();
  if (packetSize) {
    int len = Udp.read(incomingPacket, packetSize);
    Serial.printf("len = %d\n", len);
  }
}

On the Linux host (wired) talking to the UDP broadcast 8266:

$ /tmp/sender  224.1.1.3 6000

On the ESP8266:

UDP begin
224.1.1.3
6000
len = 13
len = 13
len = 13
......

Closing for now due to age and non-repeatability under current code.