diff --git a/test/avdtp/avdtp.h b/test/avdtp/avdtp.h
index d3e7dc02e..da30420bd 100644
--- a/test/avdtp/avdtp.h
+++ b/test/avdtp/avdtp.h
@@ -79,6 +79,80 @@ extern "C" {
 #define AVDTP_SINK_SF_Recorder      0x0004
 #define AVDTP_SINK_SF_Amplifier     0x0008
 
+// ACP to INT, Signal Response Header Error Codes
+#define BAD_HEADER_FORMAT 0x01
+
+// ACP to INT, Signal Response Payload Format Error Codes
+#define BAD_LENGTH 0x11
+#define BAD_ACP_SEID 0x12
+#define SEP_IN_USE 0x13
+#define SEP_NOT_IN_USE 0x14
+#define BAD_SERV_CATEGORY 0x17
+#define BAD_PAYLOAD_FORMAT 0x18
+#define NOT_SUPPORTED_COMMAND 0x19
+#define INVALID_CAPABILITIES 0x1A
+
+// ACP to INT, Signal Response Transport Service Capabilities Error Codes
+#define BAD_RECOVERY_TYPE 0x22
+#define BAD_MEDIA_TRANSPORT_FORMAT 0x23
+#define BAD_RECOVERY_FORMAT 0x25
+#define BAD_ROHC_FORMAT 0x26
+#define BAD_CP_FORMAT 0x27
+#define BAD_MULTIPLEXING_FORMAT 0x28
+#define UNSUPPORTED_CONFIGURAION 0x29
+
+// ACP to INT, Procedure Error Codes
+#define BAD_STATE 0x31
+// Signal Identifier fields
+typedef enum {
+    AVDTP_DISCOVER = 0x01,
+    AVDTP_GET_CAPABILITIES,
+    AVDTP_SET_CONFIGURATION,
+    AVDTP_GET_CONFIGURATION,
+    AVDTP_RECONFIGURE,
+    AVDTP_OPEN,
+    AVDTP_START,
+    AVDTP_CLOSE,
+    AVDTP_SUSPEND,
+    AVDTP_ABORT,
+    AVDTP_SECURITY_CONTROL,
+    AVDTP_GET_ALL_CAPABILITIES,
+    AVDTP_DELAYREPORT
+} avdtp_signal_identifier_t;
+
+typedef enum {
+    AVDTP_SINGLE_PACKET= 0,
+    AVDTP_START_PACKET    ,
+    AVDTP_CONTINUE_PACKET ,
+    AVDTP_END_PACKET
+} avdtp_packet_type_t;
+
+typedef enum {
+    AVDTP_CMD_MSG = 0,
+    AVDTP_GENERAL_REJECT_MSG   ,
+    AVDTP_RESPONSE_ACCEPT_MSG ,
+    AVDTP_RESPONSE_REJECT_MSG
+} avdtp_message_type_t;
+
+typedef enum{
+    AVDTP_AUDIO = 0,
+    AVDTP_VIDEO,
+    AVDTP_MULTIMEDIA 
+} avdtp_media_type_t;
+
+typedef enum{
+    AVDTP_SOURCE = 0,
+    AVDTP_SINK
+} avdtp_sep_type_t;
+
+typedef struct {
+    uint8_t seid;           // 0x01 – 0x3E, 6bit
+    uint8_t in_use;         // 1 bit, 0 - not in use, 1 - in use
+    avdtp_media_type_t media_type;     // 4 bit
+    avdtp_sep_type_t   type;       // 1 bit, 0 - SRC, 1 - SNK
+} avdtp_sep_t;
+
+
 #if defined __cplusplus
 }
 #endif
diff --git a/test/avdtp/avdtp_sink.c b/test/avdtp/avdtp_sink.c
index edab58dcd..de702c430 100644
--- a/test/avdtp/avdtp_sink.c
+++ b/test/avdtp/avdtp_sink.c
@@ -51,6 +51,8 @@ static const char * default_avdtp_sink_service_provider_name = "BTstack AVDTP Si
 
 static btstack_linked_list_t avdtp_sink_connections = NULL;
 
+static uint8_t transaction_label = 0;
+
 static btstack_packet_handler_t avdtp_sink_callback;
 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
 static void avdtp_sink_run_for_connection(avdtp_sink_connection_t *connection);
@@ -138,8 +140,6 @@ void a2dp_sink_create_sdp_record(uint8_t * service,  uint32_t service_record_han
 static avdtp_sink_connection_t * create_avdtp_sink_connection_context(bd_addr_t bd_addr){
     avdtp_sink_connection_t * avdtp_connection = btstack_memory_avdtp_sink_connection_get();
     if (!avdtp_connection) return NULL;
-    printf("create_avdtp_sink_connection_context %p\n", avdtp_connection);
-    
     memset(avdtp_connection,0, sizeof(avdtp_sink_connection_t));
     memcpy(avdtp_connection->remote_addr, bd_addr, 6);
     avdtp_connection->state = AVDTP_SINK_IDLE;
@@ -172,10 +172,77 @@ static avdtp_sink_connection_t * get_avdtp_sink_connection_context_for_l2cap_cid
     return NULL;
 }
 
-static void remove_avdtp_sink_connection_context(avdtp_sink_connection_t * connection){
+static void avdtp_sink_remove_connection_context(avdtp_sink_connection_t * connection){
     btstack_linked_list_remove(&avdtp_sink_connections, (btstack_linked_item_t*) connection);   
 }
 
+static inline uint8_t avdtp_header(uint8_t tr_label, avdtp_packet_type_t packet_type, avdtp_message_type_t msg_type){
+    return (tr_label<<4) | ((uint8_t)packet_type<<2) | (uint8_t)msg_type;
+}
+
+static int avdtp_sink_send_discover_cmd(uint16_t cid){
+    uint8_t command[2];
+    command[0] = avdtp_header(transaction_label, AVDTP_SINGLE_PACKET, AVDTP_CMD_MSG);
+    command[1] = (uint8_t)AVDTP_DISCOVER;
+    return l2cap_send(cid, command, sizeof(command));
+}
+
+static int avdtp_sink_send_get_capabilities_cmd(uint16_t cid, uint8_t sep_id){
+    return 0;
+}
+
+static void handle_l2cap_data_packet(avdtp_sink_connection_t * connection, uint8_t *packet, uint16_t size){
+    if (size < 2) {
+        log_error("l2cap data packet too small");
+        return;
+    }
+    uint8_t tr_label = packet[0] >> 4;
+    avdtp_packet_type_t packet_type = (avdtp_packet_type_t)((packet[0] >> 2) & 0x03);
+    avdtp_message_type_t msg_type = (avdtp_message_type_t) (packet[0] & 0x03);
+    uint8_t signal_identifier = packet[1] & 0x3f;
+
+    printf("\nheader: tr_label %d, packet_type %d, msg_type %d, signal_identifier %02x\n", tr_label, packet_type, msg_type, signal_identifier);
+    
+    int i = 2;
+    avdtp_sep_t sep;
+
+    switch (connection->state){
+        case AVDTP_SINK_W4_SEPS_DISCOVERED:
+            if (tr_label != transaction_label){
+                log_error("unexpected transaction label, got %d, expected %d", tr_label, transaction_label);
+                return;
+            }
+            if (signal_identifier != AVDTP_DISCOVER) {
+                log_error("unexpected signal identifier ...");
+                return;
+            }
+            if (size == 3){
+                printf("ERROR code %02x\n", packet[2]);
+                return;
+            }
+            for (i = 2; i<size; i+=2){
+                sep.seid = packet[i] >> 2;
+                if (sep.seid < 0x01 || sep.seid > 0x3E){
+                    log_error("invalid sep id");
+                    return;
+                }
+                sep.in_use = (packet[i] >> 1) & 0x01;
+                sep.media_type = (avdtp_media_type_t)(packet[i+1] >> 4);
+                sep.type = (avdtp_sep_type_t)((packet[i+1] >> 3) & 0x01);
+                connection->remote_seps[connection->remote_seps_num++] = sep;
+                printf("found sep: seid %u, in_use %d, media type %d, sep type %d (1-SNK)\n", 
+                    sep.seid, sep.in_use, sep.media_type, sep.type);
+            }
+            // connection->state = AVDTP_SINK_W2_GET_CAPABILITIES;
+            // transaction_label++;
+            // l2cap_request_can_send_now_event(connection->l2cap_cid);
+            break;
+        default:
+            printf_hexdump( packet, size );
+            break;
+    }
+}
+
 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
     bd_addr_t event_addr;
     hci_con_handle_t con_handle;
@@ -183,14 +250,15 @@ static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packe
     uint16_t remote_cid;
     uint16_t local_cid;
     avdtp_sink_connection_t * connection = NULL;
-
-    printf("avdtp_sink packet handler: Received packet type %02x\n", packet_type);
-            
+        
     switch (packet_type) {
         case L2CAP_DATA_PACKET:
-            // just dump data for now
-            printf("source cid %x -- ", channel);
-            // printf_hexdump( packet, size );
+            connection = get_avdtp_sink_connection_context_for_l2cap_cid(channel);
+            if (!connection){
+                log_error("avdtp packet handler L2CAP_EVENT_INCOMING_CONNECTION: connection for local cid 0x%02x not found", channel);
+                break;
+            }
+            handle_l2cap_data_packet(connection, packet, size);
             break;
             
         case HCI_EVENT_PACKET:
@@ -198,11 +266,11 @@ static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packe
                 case L2CAP_EVENT_INCOMING_CONNECTION:
                     l2cap_event_incoming_connection_get_address(packet, event_addr);
                     connection = get_avdtp_sink_connection_context_for_bd_addr(event_addr);
-                    if (connection){
-                        log_error("");
+                    if (!connection){
+                        log_error("avdtp packet handler L2CAP_EVENT_INCOMING_CONNECTION: connection for bd address %s not found", bd_addr_to_str(event_addr));
                         break;
                     }
-                    
+
                     connection = create_avdtp_sink_connection_context(event_addr);
                     if (!connection) return;
 
@@ -233,11 +301,14 @@ static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packe
                     connection->l2cap_cid = l2cap_event_channel_opened_get_local_cid(packet); 
                     connection->acl_handle = l2cap_event_channel_opened_get_handle(packet);
 
-                    printf("Channel successfully opened: %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x\n",
-                           bd_addr_to_str(event_addr), connection->acl_handle, psm, connection->l2cap_cid,  l2cap_event_channel_opened_get_remote_cid(packet));
+                    printf("Channel successfully opened: %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x, context %p\n",
+                           bd_addr_to_str(event_addr), connection->acl_handle, psm, connection->l2cap_cid,  l2cap_event_channel_opened_get_remote_cid(packet),
+                           connection);
                     
 
-                    connection->state = AVDTP_SINK_W4_CONFIGURATION_COMPLETE;
+                    connection->state = AVDTP_SINK_W2_DISCOVER_SEPS;
+                    transaction_label++;
+                    l2cap_request_can_send_now_event(connection->l2cap_cid);
                     break;
                 
                 case L2CAP_EVENT_CHANNEL_CLOSED:
@@ -247,7 +318,7 @@ static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packe
                     if (!connection || connection->state != AVDTP_SINK_W4_L2CAP_DISCONNECTED) return;
 
                     log_info("L2CAP_EVENT_CHANNEL_CLOSED cid 0x%0x", local_cid);
-                    remove_avdtp_sink_connection_context(connection);
+                    avdtp_sink_remove_connection_context(connection);
                     connection->state = AVDTP_SINK_IDLE;
                     break;
 
@@ -284,29 +355,42 @@ static void avdtp_sink_run_for_connection(avdtp_sink_connection_t *connection){
     if (connection->release_l2cap_connection){
         if (connection->state > AVDTP_SINK_W4_L2CAP_CONNECTED || 
             connection->state < AVDTP_SINK_W4_L2CAP_DISCONNECTED){
-                connection->release_l2cap_connection = 0;
-                connection->state = AVDTP_SINK_W4_L2CAP_DISCONNECTED;
-                l2cap_disconnect(connection->l2cap_cid, 0);
+            
+            connection->release_l2cap_connection = 0;
+            connection->state = AVDTP_SINK_W4_L2CAP_DISCONNECTED;
+            l2cap_disconnect(connection->l2cap_cid, 0);
             return;
         }
     }
 
-    // if (!l2cap_can_send_packet_now(connection->l2cap_cid)) {
-    //     log_info("avdtp_sink_run_for_connection: request cannot send for 0x%02x", connection->l2cap_cid);
-    //     return;
-    // }
-    
+    if (!l2cap_can_send_packet_now(connection->l2cap_cid)) {
+        log_info("avdtp_sink_run_for_connection: request cannot send for 0x%02x", connection->l2cap_cid);
+        return;
+    }
+
+    switch (connection->state){
+        case AVDTP_SINK_W2_DISCOVER_SEPS:
+            avdtp_sink_send_discover_cmd(connection->l2cap_cid);
+            connection->state = AVDTP_SINK_W4_SEPS_DISCOVERED;
+            break;
+        case AVDTP_SINK_W2_GET_CAPABILITIES:
+            avdtp_sink_send_get_capabilities_cmd(connection->l2cap_cid, 0);
+            connection->state = AVDTP_SINK_W4_CAPABILITIES;
+            break;
+        default:
+            break;
+    }    
 }
 
 void avdtp_sink_connect(bd_addr_t bd_addr){
     avdtp_sink_connection_t * connection = get_avdtp_sink_connection_context_for_bd_addr(bd_addr);
     if (connection) {
-        log_error("...");
+        log_error("avdtp_sink_connect: connection for bd address %s not found", bd_addr_to_str(bd_addr));
         return;
     }
     connection = create_avdtp_sink_connection_context(bd_addr);
     if (!connection){
-        log_error("");
+        log_error("avdtp_sink_connect: cannot create connection for bd address %s", bd_addr_to_str(bd_addr));
         return;
     }
 
@@ -314,11 +398,10 @@ void avdtp_sink_connect(bd_addr_t bd_addr){
     l2cap_create_channel(packet_handler, connection->remote_addr, PSM_AVDTP, 0xffff, NULL);
 }
 
-
 void avdtp_sink_disconnect(uint16_t l2cap_cid){
     avdtp_sink_connection_t * connection = get_avdtp_sink_connection_context_for_l2cap_cid(l2cap_cid);
     if (!connection) {
-        log_error("avdtp_sink_disconnect Connection with l2cap_cid %d not found", l2cap_cid);
+        log_error("avdtp_sink_disconnect: Connection with l2cap_cid %d not found", l2cap_cid);
         return;
     }
 
@@ -328,3 +411,5 @@ void avdtp_sink_disconnect(uint16_t l2cap_cid){
     connection->release_l2cap_connection = 1;
     avdtp_sink_run_for_connection(connection);
 }
+
+
diff --git a/test/avdtp/avdtp_sink.h b/test/avdtp/avdtp_sink.h
index 6ef411767..6c6b0ae5a 100644
--- a/test/avdtp/avdtp_sink.h
+++ b/test/avdtp/avdtp_sink.h
@@ -48,6 +48,7 @@
 
 #include <stdint.h>
 #include "hci.h"
+#include "avdtp.h"
 
 #if defined __cplusplus
 extern "C" {
@@ -56,8 +57,16 @@ extern "C" {
 typedef enum {
     AVDTP_SINK_IDLE,
     AVDTP_SINK_W4_L2CAP_CONNECTED,
-    AVDTP_SINK_W4_CONFIGURATION_COMPLETE,
+    AVDTP_SINK_W2_DISCOVER_SEPS,
+    AVDTP_SINK_W4_SEPS_DISCOVERED,
+    AVDTP_SINK_W2_GET_CAPABILITIES,
+    AVDTP_SINK_W4_CAPABILITIES,
 
+    AVDTP_SINK_CONFIGURED,
+    AVDTP_SINK_OPEN,
+    AVDTP_SINK_STREAMING,
+    AVDTP_SINK_CLOSING,
+    AVDTP_SINK_ABORTING,
     AVDTP_SINK_W4_L2CAP_DISCONNECTED
 } avdtp_sink_state_t;
 
@@ -70,6 +79,10 @@ typedef struct avdtp_sink_connection {
 
     avdtp_sink_state_t state;
 
+    avdtp_sep_t remote_seps[5];
+    uint8_t remote_seps_num;
+    uint8_t remote_sep_index_get_capabilities;
+    
     uint8_t release_l2cap_connection;
 } avdtp_sink_connection_t;
 
@@ -105,7 +118,7 @@ void avdtp_sink_connect(bd_addr_t bd_addr);
 
 /**
  * @brief Disconnect from device with connection handle. 
- * @param acl_handle
+ * @param l2cap_cid
  */
 void avdtp_sink_disconnect(uint16_t l2cap_cid);
 
diff --git a/test/avdtp/avdtp_test.c b/test/avdtp/avdtp_test.c
index cf9535a01..65bd706da 100644
--- a/test/avdtp/avdtp_test.c
+++ b/test/avdtp/avdtp_test.c
@@ -123,7 +123,7 @@ static void stdin_process(btstack_data_source_t *ds, btstack_data_source_callbac
             break;
         case 'd':
             printf("L2CAP Channel Closed\n");
-            // l2cap_disconnect(local_cid, 0);
+            // avdtp_sink_disconnect(local_cid);
             break;
         case '\n':
         case '\r':
diff --git a/test/sbc/Makefile b/test/sbc/Makefile
index 25686823a..337ebe226 100644
--- a/test/sbc/Makefile
+++ b/test/sbc/Makefile
@@ -47,7 +47,7 @@ sbc_encoder_test: ${SBC_DECODER_OBJ} ${SBC_ENCODER_OBJ} ${COMMON_OBJ} sbc_encode
 	${CC} $^ ${CFLAGS} ${LDFLAGS} -o $@
 
 test: all
-	./sbc_decoder_test data/sine-4sb-mono.sbc data/sine-4sb-decoded-mono.wav
+	./sbc_decoder_test data/sine-4sb-mono msbc 1 100
 	./sbc_encoder_test data/sine-mono.wav data/sine-4sb-mono.sbc
 
 pytest-sine:
@@ -61,17 +61,6 @@ pytest-sine:
 	./sbc_encoder_test.py data/sine-stereo.wav 16 4 30 1 2 data/sine-4sb-stereo.sbc
 	./sbc_encoder_test.py data/sine-stereo.wav 16 8 64 2 data/sine-8sb-stereo.sbc
 
-pytest-short:
-	./sbc_decoder_test.py data/fanfare-short-4sb-mono.sbc 0 SIG data/fanfare-short-4sb-decoded-mono.wav
-	./sbc_decoder_test.py data/fanfare-short-8sb-mono.sbc 0 V1 data/fanfare-short-8sb-decoded-mono.wav
-	./sbc_decoder_test.py data/fanfare-short-4sb-stereo.sbc 2 SIG data/fanfare-short-4sb-decoded-stereo.wav
-	./sbc_decoder_test.py data/fanfare-short-8sb-stereo.sbc 2 SIG data/fanfare-short-8sb-decoded-stereo.wav
-	
-	./sbc_encoder_test.py data/fanfare-short-mono.wav 16 4 31 1 0 data/fanfare-short-4sb-mono.sbc
-	./sbc_encoder_test.py data/fanfare-short-mono.wav 16 8 64 1 0 data/fanfare-short-8sb-mono.sbc
-	./sbc_encoder_test.py data/fanfare-short-stereo.wav 16 4 30 1 2 data/fanfare-short-4sb-stereo.sbc
-	./sbc_encoder_test.py data/fanfare-short-stereo.wav 16 8 62 1 2 data/fanfare-short-8sb-stereo.sbc
-	
 pytest:
 	./sbc_decoder_test.py data/fanfare-4sb-mono.sbc data/fanfare-4sb-decoded-mono.wav
 	./sbc_decoder_test.py data/fanfare-8sb-mono.sbc data/fanfare-8sb-decoded-mono.wav
diff --git a/test/sbc/data/fanfare-4sb-decoded-stereo.wav b/test/sbc/data/fanfare-4sb-decoded-stereo.wav
deleted file mode 100644
index d1b5ddbff..000000000
Binary files a/test/sbc/data/fanfare-4sb-decoded-stereo.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-8sb-decoded-mono.wav b/test/sbc/data/fanfare-8sb-decoded-mono.wav
deleted file mode 100644
index 9a24d5b6b..000000000
Binary files a/test/sbc/data/fanfare-8sb-decoded-mono.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-8sb-decoded-stereo.wav b/test/sbc/data/fanfare-8sb-decoded-stereo.wav
deleted file mode 100644
index 2aa7675d9..000000000
Binary files a/test/sbc/data/fanfare-8sb-decoded-stereo.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-4sb-decoded-mono.wav b/test/sbc/data/fanfare-short-4sb-decoded-mono.wav
deleted file mode 100644
index f9a6c1c54..000000000
Binary files a/test/sbc/data/fanfare-short-4sb-decoded-mono.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-4sb-decoded-stereo.wav b/test/sbc/data/fanfare-short-4sb-decoded-stereo.wav
deleted file mode 100644
index 3417ad5de..000000000
Binary files a/test/sbc/data/fanfare-short-4sb-decoded-stereo.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-4sb-mono.sbc b/test/sbc/data/fanfare-short-4sb-mono.sbc
deleted file mode 100644
index d8734cc90..000000000
Binary files a/test/sbc/data/fanfare-short-4sb-mono.sbc and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-4sb-stereo.sbc b/test/sbc/data/fanfare-short-4sb-stereo.sbc
deleted file mode 100644
index 48b68adc8..000000000
Binary files a/test/sbc/data/fanfare-short-4sb-stereo.sbc and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-8sb-decoded-mono.wav b/test/sbc/data/fanfare-short-8sb-decoded-mono.wav
deleted file mode 100644
index 42072e60e..000000000
Binary files a/test/sbc/data/fanfare-short-8sb-decoded-mono.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-8sb-decoded-stereo.wav b/test/sbc/data/fanfare-short-8sb-decoded-stereo.wav
deleted file mode 100644
index d832b6e22..000000000
Binary files a/test/sbc/data/fanfare-short-8sb-decoded-stereo.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-8sb-mono.sbc b/test/sbc/data/fanfare-short-8sb-mono.sbc
deleted file mode 100644
index b59855a10..000000000
Binary files a/test/sbc/data/fanfare-short-8sb-mono.sbc and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-8sb-stereo.sbc b/test/sbc/data/fanfare-short-8sb-stereo.sbc
deleted file mode 100644
index 058d1c526..000000000
Binary files a/test/sbc/data/fanfare-short-8sb-stereo.sbc and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-mono.wav b/test/sbc/data/fanfare-short-mono.wav
deleted file mode 100644
index 06ec83f8f..000000000
Binary files a/test/sbc/data/fanfare-short-mono.wav and /dev/null differ
diff --git a/test/sbc/data/fanfare-short-stereo.wav b/test/sbc/data/fanfare-short-stereo.wav
deleted file mode 100644
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