diff --git a/example/le_streamer.c b/example/le_streamer.c
index b164a459f..9675c2d4b 100644
--- a/example/le_streamer.c
+++ b/example/le_streamer.c
@@ -229,9 +229,19 @@ static void streamer(void){
 
 /* LISTING_START(attWrite): ATT Write */
 static int att_write_callback(hci_con_handle_t con_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){
-    if (att_handle != ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE) return 0;
-    le_notification_enabled = little_endian_read_16(buffer, 0) == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION;
-    test_reset();
+    // printf("att_write_callback att_handle %04x, transaction mode %u\n", att_handle, transaction_mode);
+    if (transaction_mode != ATT_TRANSACTION_MODE_NONE) return 0;
+    switch(att_handle){
+        case ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE:
+            le_notification_enabled = little_endian_read_16(buffer, 0) == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION;
+            printf("Notifications enabled %u\n", le_notification_enabled);            
+            test_reset();
+            break;
+        case ATT_CHARACTERISTIC_0000FF12_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE:
+            printf("Write to ...FF12...: ");
+            printf_hexdump(buffer, buffer_size);
+            break;       
+    }
     return 0;
 }
 /* LISTING_END */
diff --git a/example/le_streamer.gatt b/example/le_streamer.gatt
index 7584dd82d..b801b417a 100644
--- a/example/le_streamer.gatt
+++ b/example/le_streamer.gatt
@@ -6,7 +6,9 @@ CHARACTERISTIC, GATT_SERVICE_CHANGED, READ,
 
 // Test Service
 PRIMARY_SERVICE, 0000FF10-0000-1000-8000-00805F9B34FB
-// Test Characteristic, only with notify
+// Test Characteristic, only notify
 CHARACTERISTIC,  0000FF11-0000-1000-8000-00805F9B34FB,  NOTIFY,
+// Test Characterisitic, only write_without_response
+CHARACTERISTIC,  0000FF12-0000-1000-8000-00805F9B34FB, WRITE_WITHOUT_RESPONSE | DYNAMIC,