diff --git a/examples/sandbox/ble/client-as-source/communication-ble-client-send/communication-ble-client-send.ino b/examples/sandbox/ble/client-as-source/communication-ble-client-send/communication-ble-client-send.ino
new file mode 100644
index 0000000000..be766c7062
--- /dev/null
+++ b/examples/sandbox/ble/client-as-source/communication-ble-client-send/communication-ble-client-send.ino
@@ -0,0 +1,39 @@
+/**
+ * @file communications-ble-client-send.ino
+ * @author Phil Schatzmann
+ * @brief Sending audio via BLE: the client acts as audio source
+ * @version 0.1
+ * @date 2022-11-04
+ *
+ * @copyright Copyright (c) 2022
+ */
+
+
+#include "AudioTools.h"
+#include "AudioCodecs/CodecADPCM.h" // https://github.com/pschatzmann/adpcm
+#include "Sandbox/BLE/AudioBLE.h"
+
+AudioInfo info(16000, 1, 16);
+SineWaveGenerator<int16_t> sineWave( 32000);  // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound( sineWave);  // Stream generated from sine wave
+Throttle throttle(sound);
+AudioBLEClient ble;
+ADPCMEncoder adpcm(AV_CODEC_ID_ADPCM_IMA_WAV);
+EncodedAudioStream encoder(&ble, &adpcm);
+StreamCopy copier(encoder, throttle);
+
+void setup() {
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial, AudioLogger::Info);
+
+  sineWave.begin(info, N_B4);
+  throttle.begin(info);
+  encoder.begin(info);
+  ble.begin("ble-send", 60*10);
+
+  Serial.println("started...");
+}
+
+void loop() {
+  copier.copy();
+}
\ No newline at end of file
diff --git a/examples/sandbox/ble/client-as-source/communication-ble-server-receive/communication-ble-server-receive.ino b/examples/sandbox/ble/client-as-source/communication-ble-server-receive/communication-ble-server-receive.ino
new file mode 100644
index 0000000000..63ab3185d5
--- /dev/null
+++ b/examples/sandbox/ble/client-as-source/communication-ble-server-receive/communication-ble-server-receive.ino
@@ -0,0 +1,38 @@
+/**
+ * @file communications-ble-server-receive.ino
+ * @author Phil Schatzmann
+ * @brief Receiving audio via BLE: the server acts as audio sink
+ * @version 0.1
+ * @date 2022-11-04
+ *
+ * @copyright Copyright (c) 2022
+ */
+
+#include "AudioTools.h"
+#include "AudioCodecs/CodecADPCM.h" // https://github.com/pschatzmann/adpcm
+#include "Sandbox/BLE/AudioBLE.h"
+//#include "AudioLibs/AudioKit.h"
+
+AudioInfo info(16000, 1, 16);
+ADPCMDecoder adpcm(AV_CODEC_ID_ADPCM_IMA_WAV);
+I2SStream i2s; // or AudioKitStream ...
+EncodedAudioStream decoder(&i2s, &adpcm);
+AudioBLEServer ble;
+StreamCopy copier(decoder, ble);
+
+void setup() {
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial, AudioLogger::Warning);
+ 
+  decoder.begin(info);
+  
+  auto cfg = i2s.defaultConfig();
+  cfg.copyFrom(info);
+  i2s.begin(cfg);
+
+  ble.begin("ble-receive");
+}
+
+void loop() { 
+  copier.copy();
+}
\ No newline at end of file
diff --git a/examples/sandbox/ble/communication-ble-client/communication-ble-client.ino b/examples/sandbox/ble/server-as-source/communication-ble-client-receive/communication-ble-client-receive.ino
similarity index 81%
rename from examples/sandbox/ble/communication-ble-client/communication-ble-client.ino
rename to examples/sandbox/ble/server-as-source/communication-ble-client-receive/communication-ble-client-receive.ino
index 3f2269e5d8..f4ef9cff92 100644
--- a/examples/sandbox/ble/communication-ble-client/communication-ble-client.ino
+++ b/examples/sandbox/ble/server-as-source/communication-ble-client-receive/communication-ble-client-receive.ino
@@ -1,11 +1,11 @@
 /**
- * @file example-serial-receive.ino
+ * @file communications-ble-client-receive.ino
  * @author Phil Schatzmann
- * @brief Receiving audio via BLE and writing to I2S
+ * @brief Receiving audio via BLE: The client acts as audio sink and is writing to I2S
  * @version 0.1
- * @date 2022-03-09
+ * @date 2022-11-04
  *
- * @copyright Copyright (c) 2022
+ * @copyright Copyright (c) 2023
  */
 
 
diff --git a/examples/sandbox/ble/communication-ble-server/communication-ble-server.ino b/examples/sandbox/ble/server-as-source/communication-ble-server-send/communication-ble-server-send.ino
similarity index 83%
rename from examples/sandbox/ble/communication-ble-server/communication-ble-server.ino
rename to examples/sandbox/ble/server-as-source/communication-ble-server-send/communication-ble-server-send.ino
index 1f3a1545dd..233b917cac 100644
--- a/examples/sandbox/ble/communication-ble-server/communication-ble-server.ino
+++ b/examples/sandbox/ble/server-as-source/communication-ble-server-send/communication-ble-server-send.ino
@@ -1,11 +1,11 @@
 /**
- * @file communications-ble-send.ino
+ * @file communications-ble-server-send.ino
  * @author Phil Schatzmann
- * @brief Sending audio via BLE
+ * @brief Sending audio via BLE: The server acts as audio source
  * @version 0.1
- * @date 2022-03-09
+ * @date 2022-11-04
  *
- * @copyright Copyright (c) 2022
+ * @copyright Copyright (c) 2023
  */
 
 #include "AudioTools.h"
diff --git a/src/Sandbox/BLE/AudioBLEClient.h b/src/Sandbox/BLE/AudioBLEClient.h
index 009971c7d3..89224e56bf 100644
--- a/src/Sandbox/BLE/AudioBLEClient.h
+++ b/src/Sandbox/BLE/AudioBLEClient.h
@@ -70,17 +70,31 @@ class AudioBLEClient : public AudioBLEStream,
   size_t write(const uint8_t *data, size_t dataSize) override {
     TRACED();
     setupBLEClient();
-    int result = 0;
     if (!is_client_connected || !is_client_set_up)
       return 0;
-    if (ch02_char->canWrite()) {
-      ch02_char->writeValue((uint8_t *)data, dataSize, false);
-      result = dataSize;
+    if (!ch02_char->canWrite()){
+      return 0;
+    }
+
+    if (is_framed){
+      writeChannel2Characteristic(data, dataSize);
+      delay(1);
+    } else {
+      // send only data with max mtu
+      for (int j=0; j<dataSize; j++){
+        write_buffer.write(data[j]);
+        if (write_buffer.isFull()){
+          writeChannel2Characteristic(write_buffer.data(), write_buffer.available());
+          write_buffer.reset();
+        }
+      }
     }
-    return result;
+    return dataSize;
   }
 
-  int availableForWrite() override { return BLE_MTU - BLE_MTU_OVERHEAD; }
+  int availableForWrite() override { 
+    return is_framed ? (BLE_MTU - BLE_MTU_OVERHEAD) : DEFAULT_BUFFER_SIZE; 
+  }
 
   bool connected() override {
     if (!setupBLEClient()) {
@@ -89,7 +103,13 @@ class AudioBLEClient : public AudioBLEStream,
     return is_client_connected;
   }
 
-  void doLoop() { setupBLEClient(); }
+  void setWriteThrottle(int ms){
+    write_throttle = ms;
+  }
+
+  void setConfirmWrite(bool flag){
+    write_confirmation_flag = flag;
+  }
 
 protected:
   // client
@@ -105,6 +125,9 @@ class AudioBLEClient : public AudioBLEStream,
   BLEUUID BLUEID_CH1_UUID{BLE_CH1_UUID};
   BLEUUID BLUEID_CH2_UUID{BLE_CH2_UUID};
   BLEUUID BLUEID_INFO_UUID{BLE_INFO_UUID};
+  SingleBuffer<uint8_t> write_buffer{0};
+  int write_throttle = 0;
+  bool write_confirmation_flag = false;
 
   volatile bool is_client_connected = false;
   bool is_client_set_up = false;
@@ -125,6 +148,13 @@ class AudioBLEClient : public AudioBLEStream,
     info_char->writeValue((uint8_t *)&info, sizeof(AudioInfo));
   }
 
+  void writeChannel2Characteristic(const uint8_t*data, size_t len){
+    if (ch02_char->canWrite()) {
+      ch02_char->writeValue((uint8_t *)data, len, write_confirmation_flag);
+      delay(write_throttle);
+    }
+  }
+
   bool readAudioInfoCharacteristic(){
     if (!info_char->canRead())
       return false;
@@ -166,6 +196,11 @@ class AudioBLEClient : public AudioBLEStream,
 
     TRACEI();
 
+    // setup buffer
+    if (write_buffer.size()==0){
+      write_buffer.resize(getMTU() - BLE_MTU_OVERHEAD);
+    }
+
     if (p_client == nullptr)
       p_client = BLEDevice::createClient();