No Data Copied When Using Ethernet

[acrylo-code]

Hi everyone,

I'm trying to get the streams-eth_url_mp3_helix-i2si example working. I enabled #define USE_Ethernet and disabled #define USE_Wifi. However, while everything seems to initialize correctly, no audio data is copied—StreamCopy::copy keeps returning 0 bytes.

What Works
When using then WiFi example, the same setup works perfectly.

Setup
Hardware: Arduino Nano ESP32s3+ EENC28J60 Ethernet Shield
AudioTools Library + EthernetENC library
MP3 Decoder: MP3DecoderHelix
Streaming URL: http://stream.srg-ssr.ch/m/rsj/mp3_128
Ethernet Settings: DHCP successfully assigns an IP
Serial Logs: Ethernet connects, HTTP request is sent, and I receive an HTTP 200 OK response. However, the StreamCopy operation does not transfer any data.

Observations
The HTTP request is properly sent and acknowledged (200 OK).
no CONTENT_LENGTH found in reply appears in logs—could this be an issue?
The stream remains at size: 0, and no data gets copied.
Same code works fine over WiFi.

Question
Is there anything I might be missing when using Ethernet instead of WiFi? Could this be related to chunked transfer encoding or some other HTTP issue? Any guidance would be greatly appreciated!

Thanks in advance!

#include "AudioTools.h"
#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
#include <SPI.h>
#include <EthernetENC.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
const int CS = SS;
EthernetClient eth;
URLStream url(eth);
I2SStream i2s; // final output of decoded stream
EncodedAudioStream dec(&i2s, new MP3DecoderHelix()); // Decoding stream
StreamCopy copier(dec, url); // copy url to decoder

void setupEthernet() {
  Ethernet.init(CS);
  Serial.println("Initialize Ethernet with DHCP:");
  if (Ethernet.begin(mac)) {
    Serial.print("  DHCP assigned IP ");
    Serial.println(Ethernet.localIP());
  } else {
    Serial.println("Failed to configure Ethernet using DHCP");
    stop();
  } 
}

void setup(){
  Serial.begin(115200);
  delay(5000);
  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  

  setupEthernet();

  auto config = i2s.defaultConfig(TX_MODE);
  config.pin_ws = 9;
  config.pin_bck = 11;
  config.pin_data = 12;
  i2s.begin(config);
  dec.begin();

  url.begin("http://stream.srg-ssr.ch/m/rsj/mp3_128","audio/mp3");

}

void loop(){
  copier.copy();
}}

Logs :

Initialize Ethernet with DHCP:
  DHCP assigned IP 192.168.178.78
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[I] AudioTypes.h : 130 -  sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[I] I2SConfigESP32.h : 80 - rx/tx mode: TX_MODE
[I] I2SConfigESP32.h : 81 - port_no: 0
[I] I2SConfigESP32.h : 82 - is_master: Master
[I] I2SConfigESP32.h : 83 - sample rate: 44100
[I] I2SConfigESP32.h : 84 - bits per sample: 16
[I] I2SConfigESP32.h : 85 - number of channels: 2
[I] I2SConfigESP32.h : 86 - signal_type: Digital
[I] I2SConfigESP32.h : 88 - i2s_format: I2S_STD_FORMAT
[I] I2SConfigESP32.h : 90 - auto_clear: true
[I] I2SConfigESP32.h : 92 - use_apll: true
[I] I2SConfigESP32.h : 97 - buffer_count:6
[I] I2SConfigESP32.h : 98 - buffer_size:512
[I] I2SConfigESP32.h : 103 - pin_bck: 11
[I] I2SConfigESP32.h : 105 - pin_ws: 9
[I] I2SConfigESP32.h : 107 - pin_data: 12
[I] URLStream.h : 83 - virtual bool audio_tools::URLStream::begin(const char*, const char*, MethodID, const char*, const char*): http://stream.srg-ssr.ch/m/rsj/mp3_128
[I] Url.h : 58 - Url::parse
[I] Url.h : 96 - url->http://stream.srg-ssr.ch/m/rsj/mp3_128
[I] Url.h : 97 - host->stream.srg-ssr.ch
[I] Url.h : 98 - protocol->http
[I] Url.h : 99 - path->/m/rsj/mp3_128
[I] Url.h : 100 - port->80
[I] HttpRequest.h : 238 - process connecting to host stream.srg-ssr.ch port 80
[I] HttpRequest.h : 365 - is connected true  with timeout 60000
[I] HttpRequest.h : 249 - Free heap: 327344
[I] HttpHeader.h : 276 - HttpHeader::write
[I] HttpHeader.h : 421 - -> GET /m/rsj/mp3_128 HTTP/1.1
[I] HttpHeader.h : 210 -  -> Host: stream.srg-ssr.ch 
[I] HttpHeader.h : 210 -  -> Connection: keep-alive 
[I] HttpHeader.h : 210 -  -> Accept-Encoding: identity 
[I] HttpHeader.h : 210 -  -> Accept: audio/mp3 
[I] HttpHeader.h : 342 -  -> <CR LF> 
[I] HttpRequest.h : 314 - Request written ... waiting for reply
[I] HttpHeader.h : 244 - Waiting for data...
[I] HttpHeader.h : 253 - Data available: 512
[I] HttpRequest.h : 182 - no CONTENT_LENGTH found in reply
[I] URLStream.h : 91 - size: 0
[I] URLStream.h : 98 - ==> http status: 200
[I] StreamCopy.h : 168 - StreamCopy::copy  1024 -> 15 -> 15 bytes - in 1 hops
[I] StreamCopy.h : 168 - StreamCopy::copy  1024 -> 0 -> 0 bytes - in 0 hops
[I] StreamCopy.h : 168 - StreamCopy::copy  1024 -> 0 -> 0 bytes - in 0 hops
[I] StreamCopy.h : 168 - StreamCopy::copy  1024 -> 0 -> 0 bytes - in 0 hops
[I] StreamCopy.h : 168 - StreamCopy::copy  1024 -> 0 -> 0 bytes - in 0 hops
[I] StreamCopy.h : 168 - StreamCopy::copy  1024 -> 0 -> 0 bytes - in 0 hops

[pschatzmann]

Did you try to do some basic tests with your Ethernet Library: it seems that read() method does not return the requested data...

You could also try to to call setCheckAvailable(true) on the copier to call available() automatically to check if there is any data

[acrylo-code]

After spending some time troubleshooting the issue, I tested a few different approaches, including switching to the UIPEthernet library, but the problem still persisted. I also tried adding setCheckAvailable(true) as suggested, but that didn’t seem to help.

In my investigation, I decided to try a different approach: instead of using the StreamCopy’s copy() method, I manually copied the buffer directly into the decoder. This approach seemed to work, which makes me think there could be an issue with how the data is being passed or processed in the original StreamCopy implementation.

Is there anything else I could try to make the original approach work? I would appreciate any suggestions or insights you may have.

Below is the code I used to test the EthernetClient:

#include "AudioTools.h"
#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
#include <SPI.h>
#include <EthernetENC.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
const int CS = SS;

EthernetClient ethClient;
const char *server = "stream.srg-ssr.ch";  // Example stream server
const int port = 80;  // HTTP port for streaming (80 for HTTP)
I2SStream i2s; // final output of decoded stream
EncodedAudioStream dec(&i2s, new MP3DecoderHelix()); // Decoding stream

void setupEthernet() {
  Ethernet.init(CS);
  Serial.println("Initialize Ethernet with DHCP:");
  if (Ethernet.begin(mac)) {
    Serial.print("  DHCP assigned IP ");
    Serial.println(Ethernet.localIP());
  } else {
    Serial.println("Failed to configure Ethernet using DHCP");
    stop();
  }
  Serial.print("Connecting to server: ");
  if (ethClient.connect(server, port)) {
    Serial.println("Connected to the server");

    // Send the HTTP GET request for the MP3 stream
    ethClient.print("GET /m/rsj/mp3_128 HTTP/1.1\r\n");
    ethClient.print("Host: stream.srg-ssr.ch\r\n");
    ethClient.print("Connection: close\r\n\r\n");
  } else {
    Serial.println("Connection failed! Check server address and network.");
  }
}

void setup(){
  Serial.begin(115200);
  delay(5000);
  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  

  setupEthernet();

  auto config = i2s.defaultConfig(TX_MODE);
  config.pin_ws = 9;
  config.pin_bck = 11;
  config.pin_data = 12;
  i2s.begin(config);
  dec.begin();
}


void loop() {
  // Check if there is data available to read
  if (ethClient.available()) {
    uint8_t buffer[512];  // Buffer to hold incoming data
    size_t bytesRead = ethClient.read(buffer, sizeof(buffer));

    if (bytesRead > 0) {
      dec.write(buffer, bytesRead);
    }
  }

  // If no data is available or the server closes the connection, stop
  if (!ethClient.connected()) {
    Serial.println("Disconnected from server.");
    ethClient.stop();
    while (true);  // Stop the program here
  }
}

[pschatzmann]

Did you try to find out if URLStream readBytes() is called and why it returns 0 ?

[acrylo-code]

I’m still trying to track down the cause of the issue. It seems that the available() function in StreamCopyT is returning 0 most of the time, which is why the copyBytes() function is returning 0 as well.

[pschatzmann]

Maybe an issue with setTimeout() ? available() is only called if requested by the copier...

[acrylo-code]

With a larger timeout, bytes_read is still 0. The bytes_to_read parameter (used in readBytes()) remains the default buffer size.

In my previous reply, available() was being called because of copier.setCheckAvailable(true);. I'm now testing with copier.setCheckAvailable(false);