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libraries/audio-tools/examples/examples-communication/serial/mp3-xon-xoff/send-mp3/send-mp3.ino

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+
+/**
+ * @file send-mp3.ino
+ * @brief Example of sending an mp3 stream over Serial the AudioTools library.
+ * We use xon/xoff to control the flow of the data.
+ * I am using an ESP32 Dev Module for the test with the pins TX=17 and RX=16.
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/Communication/AudioHttp.h"
+
+URLStream url("ssid", "password");  // or replace with ICYStream to get metadata
+StreamCopy copier(Serial1, url);         // copy url to decoder
+// xon/xoff flow control
+const char xon = 17;
+const char xoff = 19;
+bool is_active = false;
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Error);
+
+  // setup serial data sink
+  Serial2.begin(115200);
+
+  // mp3 radio
+  url.begin("http://stream.srg-ssr.ch/m/rsj/mp3_128", "audio/mp3");
+}
+
+// Determine if we can send data from the flow control sent by the receiver
+bool isActive() {
+  char c = Serial2.read();
+  switch (c) {
+    case xon:
+      is_active = true;
+      break;
+    case xoff:
+      is_active = false;
+      break;
+  }
+  return is_active;
+}
+
+void loop() {
+  if (isActive()) {
+    copier.copy();
+  }
+}