[D][HTTPClient.cpp:361] disconnect(): still data in buffer (5437), clean up.

#include <Arduino.h>

#ifdef ESP32
#include <WiFi.h>
#include <M5Stack.h>
#else
#include <ESP8266WiFi.h>
#endif

#include "AudioFileSourceICYStream.h"
#include "AudioFileSourceBuffer.h"
#include "AudioGeneratorMP3.h"
#include "AudioOutputI2SNoDAC.h"

// To run, set your ESP8266 build to 160MHz, update the SSID info, and upload.

// Enter your WiFi setup here:
const char *SSID = "SSID";
const char *PASSWORD = "PSK";

// Randomly picked URL
const char *URL[3] = { "http://icecast.omroep.nl/3fm-bb-mp3", "http://icecast.omroep.nl/radio5-bb-mp3", "http://icecast.omroep.nl/radio6-bb-mp3" };

AudioGeneratorMP3 *mp3;
AudioFileSourceICYStream *file;
AudioFileSourceBuffer *buff;
AudioOutputI2S *out;
int gain = 0;

// Called when a metadata event occurs (i.e. an ID3 tag, an ICY block, etc.
void IRAM_ATTR MDCallback(void *cbData, const char *type, bool isUnicode, const char *string)
{
  const char *ptr = reinterpret_cast<const char *>(cbData);
  (void)isUnicode; // Punt this ball for now
  // Note that the type and string may be in PROGMEM, so copy them to RAM for printf
  char s1[32], s2[64];
  strncpy_P(s1, type, sizeof(s1));
  s1[sizeof(s1) - 1] = 0;
  strncpy_P(s2, string, sizeof(s2));
  s2[sizeof(s2) - 1] = 0;
  M5.Lcd.printf("METADATA(%s) '%s' = '%s'\n", ptr, s1, s2);
  Serial.printf("METADATA(%s) '%s' = '%s'\n", ptr, s1, s2);
  Serial.flush();
}

// Called when there's a warning or error (like a buffer underflow or decode hiccup)
void IRAM_ATTR StatusCallback(void *cbData, int code, const char *string)
{
  const char *ptr = reinterpret_cast<const char *>(cbData);
  // Note that the string may be in PROGMEM, so copy it to RAM for printf
  char s1[64];
  strncpy_P(s1, string, sizeof(s1));
  s1[sizeof(s1) - 1] = 0;
  M5.Lcd.printf("STATUS(%s) '%d' = '%s'\n", ptr, code, s1);

}


void setup()
{
  M5.begin();
  delay(1000);
  M5.Lcd.println("Connecting to WiFi");

  WiFi.disconnect();
  WiFi.softAPdisconnect(true);
  WiFi.mode(WIFI_STA);

  WiFi.begin(SSID, PASSWORD);

  // Try forever
  while (WiFi.status() != WL_CONNECTED) {
    //M5.Lcd.println("...Connecting to WiFi");
    delay(1000);
  }
  M5.Lcd.println("Connected");

  file = new AudioFileSourceICYStream(URL[0]);
  file->RegisterMetadataCB(MDCallback, (void*)"ICY");
  buff = new AudioFileSourceBuffer(file, 32 * 1024);
  buff->loop();
  //buff->RegisterStatusCB(StatusCallback, (void*)"buffer");
  //while ( buff->getFillLevel() < 32 * 1024 ) buff->loop();
  out = new AudioOutputI2S(0, 1, 8);
  mp3 = new AudioGeneratorMP3();
  //mp3->RegisterStatusCB(StatusCallback, (void*)"mp3");
  out->SetGain(0);
  mp3->begin(buff, out);
  delay(100);
  if ( mp3->isRunning() ) out->SetGain(0.2);
  else {
    M5.Lcd.println("Could not start MP3.");
  }
}

void loop()
{
  mp3->loop();
  static uint8_t current = 0;
  const bool BTN_A_PRESSED = !digitalRead( 39 );
  if ( mp3 && !mp3->loop()) {
    mp3->stop();
  }
  if ( mp3->isRunning() && BTN_A_PRESSED ) {
    M5.Lcd.printf("Opening %s\n", URL[current]);
    out->SetGain(0);
    mp3->stop();
    //delay(10);
    if (file->isOpen() ) file->close();
    //delay(10);
    current++;
    if ( current == 3 ) current = 0;
    file->open(URL[current]);
    mp3->begin(buff, out);
    if ( mp3->isRunning() ) out->SetGain(0.2);
  }
  //delay(0);
}