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libraries/audio-tools/examples/examples-communication/a2dp/streams-generator-a2dp/README.md

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+# Test Signal to Bluetooth Speaker
+
+Sometimes it is quite useful to be able to generate a test tone.
+We can use the GeneratedSoundStream class together with a SoundGenerator class. In my example I use a SineWaveGenerator.
+
+To test the output I'm using this generated signal and write it to A2DP (e.g. a Bluetooth Speaker).
+
+### Dependencies
+
+- https://github.com/pschatzmann/ESP32-A2DP.git

libraries/audio-tools/examples/examples-communication/a2dp/streams-generator-a2dp/streams-generator-a2dp.ino

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+/**
+ * @file streams-generator-a2dp.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-generator-a2dp/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ * 
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/Communication/A2DPStream.h"
+
+const char* name = "LEXON MINO L";                         // Replace with your device name
+AudioInfo info(44100, 2, 16);
+SineWaveGenerator<int16_t> sineWave(32000);               // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> in(sineWave);               // Stream generated from sine wave
+A2DPStream out;                                           // A2DP output
+StreamCopy copier(out, in); // copy in to out
+
+// Arduino Setup
+void setup(void) {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // set the frequency
+  sineWave.setFrequency(N_B4);
+
+  // Setup sine wave
+  auto cfg = in.defaultConfig();
+  cfg.copyFrom(info);
+  in.addNotifyAudioChange(out);
+  in.begin(cfg);
+
+  // We send the test signal via A2DP - so we conect to the MyMusic Bluetooth Speaker
+  auto cfgA2DP = out.defaultConfig(TX_MODE);
+  cfgA2DP.name = name;
+  //cfgA2DP.auto_reconnect = false;
+  out.begin(cfgA2DP);
+  out.setVolume(0.3);
+  Serial.println("A2DP is connected now...");
+
+}
+
+// Arduino loop  
+void loop() {
+  copier.copy();
+}