diff --git a/extmod/btstack/modbluetooth_btstack.c b/extmod/btstack/modbluetooth_btstack.c
index 8f0c82974c..9aef7e6879 100644
--- a/extmod/btstack/modbluetooth_btstack.c
+++ b/extmod/btstack/modbluetooth_btstack.c
@@ -35,7 +35,7 @@
 
 #include "lib/btstack/src/btstack.h"
 
-#define DEBUG_EVENT_printf(...) // printf(__VA_ARGS__)
+#define DEBUG_printf(...) // printf("btstack: " __VA_ARGS__)
 
 #ifndef MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME
 #define MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME "MPY BTSTACK"
@@ -54,7 +54,7 @@ STATIC const uint16_t BTSTACK_GAP_DEVICE_NAME_HANDLE = 3;
 volatile int mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
 
 STATIC int btstack_error_to_errno(int err) {
-    DEBUG_EVENT_printf("  --> btstack error: %d\n", err);
+    DEBUG_printf("  --> btstack error: %d\n", err);
     if (err == ERROR_CODE_SUCCESS) {
         return 0;
     } else if (err == BTSTACK_ACL_BUFFERS_FULL || err == BTSTACK_MEMORY_ALLOC_FAILED) {
@@ -168,16 +168,16 @@ STATIC void btstack_remove_pending_operation(mp_btstack_pending_op_t *pending_op
 STATIC void btstack_notify_indicate_ready_handler(void *context) {
     MICROPY_PY_BLUETOOTH_ENTER
     mp_btstack_pending_op_t *pending_op = (mp_btstack_pending_op_t *)context;
-    DEBUG_EVENT_printf("btstack_notify_indicate_ready_handler op_type=%d conn_handle=%d value_handle=%d len=%lu\n", pending_op->op_type, pending_op->conn_handle, pending_op->value_handle, pending_op->len);
+    DEBUG_printf("btstack_notify_indicate_ready_handler op_type=%d conn_handle=%d value_handle=%d len=%zu\n", pending_op->op_type, pending_op->conn_handle, pending_op->value_handle, pending_op->len);
     if (pending_op->op_type == MP_BLUETOOTH_BTSTACK_PENDING_NOTIFY) {
         int err = att_server_notify(pending_op->conn_handle, pending_op->value_handle, pending_op->buf, pending_op->len);
-        DEBUG_EVENT_printf("btstack_notify_indicate_ready_handler: sending notification err=%d\n", err);
+        DEBUG_printf("btstack_notify_indicate_ready_handler: sending notification err=%d\n", err);
         assert(err == ERROR_CODE_SUCCESS);
         (void)err;
     } else {
         assert(pending_op->op_type == MP_BLUETOOTH_BTSTACK_PENDING_INDICATE);
         int err = att_server_indicate(pending_op->conn_handle, pending_op->value_handle, NULL, 0);
-        DEBUG_EVENT_printf("btstack_notify_indicate_ready_handler: sending indication err=%d\n", err);
+        DEBUG_printf("btstack_notify_indicate_ready_handler: sending indication err=%d\n", err);
         assert(err == ERROR_CODE_SUCCESS);
         (void)err;
     }
@@ -188,7 +188,7 @@ STATIC void btstack_notify_indicate_ready_handler(void *context) {
 
 // Register a pending background operation -- copies the buffer, and makes it known to the GC.
 STATIC mp_btstack_pending_op_t *btstack_enqueue_pending_operation(uint16_t op_type, uint16_t conn_handle, uint16_t value_handle, const uint8_t *buf, size_t len) {
-    DEBUG_EVENT_printf("btstack_enqueue_pending_operation op_type=%d conn_handle=%d value_handle=%d len=%lu\n", op_type, conn_handle, value_handle, len);
+    DEBUG_printf("btstack_enqueue_pending_operation op_type=%d conn_handle=%d value_handle=%d len=%zu\n", op_type, conn_handle, value_handle, len);
     mp_btstack_pending_op_t *pending_op = m_new_obj_var(mp_btstack_pending_op_t, uint8_t, len);
     pending_op->op_type = op_type;
     pending_op->conn_handle = conn_handle;
@@ -219,20 +219,20 @@ STATIC mp_btstack_pending_op_t *btstack_enqueue_pending_operation(uint16_t op_ty
 // know for sure that we're using the correct entry.
 STATIC mp_btstack_pending_op_t *btstack_finish_pending_operation(uint16_t op_type, uint16_t conn_handle, uint16_t value_handle, bool del) {
     MICROPY_PY_BLUETOOTH_ENTER
-    DEBUG_EVENT_printf("btstack_finish_pending_operation op_type=%d conn_handle=%d value_handle=%d\n", op_type, conn_handle, value_handle);
+    DEBUG_printf("btstack_finish_pending_operation op_type=%d conn_handle=%d value_handle=%d\n", op_type, conn_handle, value_handle);
     btstack_linked_list_iterator_t it;
     btstack_linked_list_iterator_init(&it, &MP_STATE_PORT(bluetooth_btstack_root_pointers)->pending_ops);
     while (btstack_linked_list_iterator_has_next(&it)) {
         mp_btstack_pending_op_t *pending_op = (mp_btstack_pending_op_t *)btstack_linked_list_iterator_next(&it);
 
         if (pending_op->op_type == op_type && pending_op->conn_handle == conn_handle && (value_handle == 0xffff || pending_op->value_handle == value_handle)) {
-            DEBUG_EVENT_printf("btstack_finish_pending_operation: found value_handle=%d len=%lu\n", pending_op->value_handle, pending_op->len);
+            DEBUG_printf("btstack_finish_pending_operation: found value_handle=%d len=%zu\n", pending_op->value_handle, pending_op->len);
             btstack_remove_pending_operation(pending_op, del);
             MICROPY_PY_BLUETOOTH_EXIT
             return del ? NULL : pending_op;
         }
     }
-    DEBUG_EVENT_printf("btstack_finish_pending_operation: not found\n");
+    DEBUG_printf("btstack_finish_pending_operation: not found\n");
     MICROPY_PY_BLUETOOTH_EXIT
     return NULL;
 }
@@ -243,7 +243,7 @@ STATIC mp_btstack_pending_op_t *btstack_finish_pending_operation(uint16_t op_typ
 STATIC void btstack_packet_handler_att_server(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
     (void)channel;
     (void)size;
-    DEBUG_EVENT_printf("btstack_packet_handler_att_server(packet_type=%u, packet=%p)\n", packet_type, packet);
+    DEBUG_printf("btstack_packet_handler_att_server(packet_type=%u, packet=%p)\n", packet_type, packet);
     if (packet_type != HCI_EVENT_PACKET) {
         return;
     }
@@ -251,13 +251,13 @@ STATIC void btstack_packet_handler_att_server(uint8_t packet_type, uint16_t chan
     uint8_t event_type = hci_event_packet_get_type(packet);
 
     if (event_type == ATT_EVENT_CONNECTED) {
-        DEBUG_EVENT_printf("  --> att connected\n");
+        DEBUG_printf("  --> att connected\n");
         // The ATT_EVENT_*CONNECTED events are fired for both peripheral and central role, with no way to tell which.
         // So we use the HCI_EVENT_LE_META event directly in the main packet handler.
     } else if (event_type == ATT_EVENT_DISCONNECTED) {
-        DEBUG_EVENT_printf("  --> att disconnected\n");
+        DEBUG_printf("  --> att disconnected\n");
     } else if (event_type == ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE) {
-        DEBUG_EVENT_printf("  --> att indication complete\n");
+        DEBUG_printf("  --> att indication complete\n");
         uint16_t conn_handle = att_event_handle_value_indication_complete_get_conn_handle(packet);
         uint16_t value_handle = att_event_handle_value_indication_complete_get_attribute_handle(packet);
         uint8_t status = att_event_handle_value_indication_complete_get_status(packet);
@@ -265,12 +265,12 @@ STATIC void btstack_packet_handler_att_server(uint8_t packet_type, uint16_t chan
     } else if (event_type == HCI_EVENT_LE_META || event_type == HCI_EVENT_DISCONNECTION_COMPLETE) {
         // Ignore, duplicated by att_server.c.
     } else {
-        DEBUG_EVENT_printf("  --> hci att server event type: unknown (0x%02x)\n", event_type);
+        DEBUG_printf("  --> hci att server event type: unknown (0x%02x)\n", event_type);
     }
 }
 
 STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t irq) {
-    DEBUG_EVENT_printf("btstack_packet_handler(packet_type=%u, packet=%p)\n", packet_type, packet);
+    DEBUG_printf("btstack_packet_handler(packet_type=%u, packet=%p)\n", packet_type, packet);
     if (packet_type != HCI_EVENT_PACKET) {
         return;
     }
@@ -278,7 +278,7 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
     uint8_t event_type = hci_event_packet_get_type(packet);
 
     if (event_type == HCI_EVENT_LE_META) {
-        DEBUG_EVENT_printf("  --> hci le meta\n");
+        DEBUG_printf("  --> hci le meta\n");
         if (hci_event_le_meta_get_subevent_code(packet) == HCI_SUBEVENT_LE_CONNECTION_COMPLETE) {
             uint16_t conn_handle = hci_subevent_le_connection_complete_get_connection_handle(packet);
             uint8_t addr_type = hci_subevent_le_connection_complete_get_peer_address_type(packet);
@@ -296,7 +296,7 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
         }
     } else if (event_type == BTSTACK_EVENT_STATE) {
         uint8_t state = btstack_event_state_get_state(packet);
-        DEBUG_EVENT_printf("  --> btstack event state 0x%02x\n", state);
+        DEBUG_printf("  --> btstack event state 0x%02x\n", state);
         if (state == HCI_STATE_WORKING) {
             // Signal that initialisation has completed.
             mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_ACTIVE;
@@ -305,21 +305,21 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
             mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
         }
     } else if (event_type == HCI_EVENT_TRANSPORT_PACKET_SENT) {
-        DEBUG_EVENT_printf("  --> hci transport packet sent\n");
+        DEBUG_printf("  --> hci transport packet sent\n");
     } else if (event_type == HCI_EVENT_COMMAND_COMPLETE) {
-        DEBUG_EVENT_printf("  --> hci command complete\n");
+        DEBUG_printf("  --> hci command complete\n");
     } else if (event_type == HCI_EVENT_COMMAND_STATUS) {
-        DEBUG_EVENT_printf("  --> hci command status\n");
+        DEBUG_printf("  --> hci command status\n");
     } else if (event_type == HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS) {
-        DEBUG_EVENT_printf("  --> hci number of completed packets\n");
+        DEBUG_printf("  --> hci number of completed packets\n");
     } else if (event_type == BTSTACK_EVENT_NR_CONNECTIONS_CHANGED) {
-        DEBUG_EVENT_printf("  --> btstack # conns changed\n");
+        DEBUG_printf("  --> btstack # conns changed\n");
     } else if (event_type == HCI_EVENT_VENDOR_SPECIFIC) {
-        DEBUG_EVENT_printf("  --> hci vendor specific\n");
+        DEBUG_printf("  --> hci vendor specific\n");
     } else if (event_type == GATT_EVENT_MTU) {
-        DEBUG_EVENT_printf("  --> hci MTU\n");
+        DEBUG_printf("  --> hci MTU\n");
     } else if (event_type == HCI_EVENT_DISCONNECTION_COMPLETE) {
-        DEBUG_EVENT_printf("  --> hci disconnect complete\n");
+        DEBUG_printf("  --> hci disconnect complete\n");
         uint16_t conn_handle = hci_event_disconnection_complete_get_connection_handle(packet);
         const hci_connection_t *conn = hci_connection_for_handle(conn_handle);
         uint16_t irq_event;
@@ -334,7 +334,7 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
         mp_bluetooth_gap_on_connected_disconnected(irq_event, conn_handle, 0xff, addr);
     #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
     } else if (event_type == GAP_EVENT_ADVERTISING_REPORT) {
-        DEBUG_EVENT_printf("  --> gap advertising report\n");
+        DEBUG_printf("  --> gap advertising report\n");
         bd_addr_t address;
         gap_event_advertising_report_get_address(packet, address);
         uint8_t adv_event_type = gap_event_advertising_report_get_advertising_event_type(packet);
@@ -346,7 +346,7 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
     } else if (event_type == GATT_EVENT_QUERY_COMPLETE) {
         uint16_t conn_handle = gatt_event_query_complete_get_handle(packet);
         uint16_t status = gatt_event_query_complete_get_att_status(packet);
-        DEBUG_EVENT_printf("  --> gatt query complete irq=%d conn_handle=%d status=%d\n", irq, conn_handle, status);
+        DEBUG_printf("  --> gatt query complete irq=%d conn_handle=%d status=%d\n", irq, conn_handle, status);
         if (irq == MP_BLUETOOTH_IRQ_GATTC_READ_DONE || irq == MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE) {
             // TODO there is no value_handle available to pass here.
             // TODO try and get this implemented in btstack.
@@ -361,28 +361,28 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
             mp_bluetooth_gattc_on_discover_complete(irq, conn_handle, status);
         }
     } else if (event_type == GATT_EVENT_SERVICE_QUERY_RESULT) {
-        DEBUG_EVENT_printf("  --> gatt service query result\n");
+        DEBUG_printf("  --> gatt service query result\n");
         uint16_t conn_handle = gatt_event_service_query_result_get_handle(packet);
         gatt_client_service_t service;
         gatt_event_service_query_result_get_service(packet, &service);
         mp_obj_bluetooth_uuid_t service_uuid = create_mp_uuid(service.uuid16, service.uuid128);
         mp_bluetooth_gattc_on_primary_service_result(conn_handle, service.start_group_handle, service.end_group_handle, &service_uuid);
     } else if (event_type == GATT_EVENT_CHARACTERISTIC_QUERY_RESULT) {
-        DEBUG_EVENT_printf("  --> gatt characteristic query result\n");
+        DEBUG_printf("  --> gatt characteristic query result\n");
         uint16_t conn_handle = gatt_event_characteristic_query_result_get_handle(packet);
         gatt_client_characteristic_t characteristic;
         gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic);
         mp_obj_bluetooth_uuid_t characteristic_uuid = create_mp_uuid(characteristic.uuid16, characteristic.uuid128);
         mp_bluetooth_gattc_on_characteristic_result(conn_handle, characteristic.start_handle, characteristic.value_handle, characteristic.properties, &characteristic_uuid);
     } else if (event_type == GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT) {
-        DEBUG_EVENT_printf("  --> gatt descriptor query result\n");
+        DEBUG_printf("  --> gatt descriptor query result\n");
         uint16_t conn_handle = gatt_event_all_characteristic_descriptors_query_result_get_handle(packet);
         gatt_client_characteristic_descriptor_t descriptor;
         gatt_event_all_characteristic_descriptors_query_result_get_characteristic_descriptor(packet, &descriptor);
         mp_obj_bluetooth_uuid_t descriptor_uuid = create_mp_uuid(descriptor.uuid16, descriptor.uuid128);
         mp_bluetooth_gattc_on_descriptor_result(conn_handle, descriptor.handle, &descriptor_uuid);
     } else if (event_type == GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT) {
-        DEBUG_EVENT_printf("  --> gatt characteristic value query result\n");
+        DEBUG_printf("  --> gatt characteristic value query result\n");
         uint16_t conn_handle = gatt_event_characteristic_value_query_result_get_handle(packet);
         uint16_t value_handle = gatt_event_characteristic_value_query_result_get_value_handle(packet);
         uint16_t len = gatt_event_characteristic_value_query_result_get_value_length(packet);
@@ -392,7 +392,7 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
         mp_bluetooth_gattc_on_data_available_chunk(data, len);
         mp_bluetooth_gattc_on_data_available_end(atomic_state);
     } else if (event_type == GATT_EVENT_NOTIFICATION) {
-        DEBUG_EVENT_printf("  --> gatt notification\n");
+        DEBUG_printf("  --> gatt notification\n");
         uint16_t conn_handle = gatt_event_notification_get_handle(packet);
         uint16_t value_handle = gatt_event_notification_get_value_handle(packet);
         uint16_t len = gatt_event_notification_get_value_length(packet);
@@ -402,7 +402,7 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
         mp_bluetooth_gattc_on_data_available_chunk(data, len);
         mp_bluetooth_gattc_on_data_available_end(atomic_state);
     } else if (event_type == GATT_EVENT_INDICATION) {
-        DEBUG_EVENT_printf("  --> gatt indication\n");
+        DEBUG_printf("  --> gatt indication\n");
         uint16_t conn_handle = gatt_event_indication_get_handle(packet);
         uint16_t value_handle = gatt_event_indication_get_value_handle(packet);
         uint16_t len = gatt_event_indication_get_value_length(packet);
@@ -413,17 +413,17 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
         mp_bluetooth_gattc_on_data_available_end(atomic_state);
     } else if (event_type == GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE) {
         uint16_t conn_handle = gatt_event_can_write_without_response_get_handle(packet);
-        DEBUG_EVENT_printf("  --> gatt can write without response %d\n", conn_handle);
+        DEBUG_printf("  --> gatt can write without response %d\n", conn_handle);
         mp_btstack_pending_op_t *pending_op = btstack_finish_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_WRITE_NO_RESPONSE, conn_handle, 0xffff, false /* !del */);
         if (pending_op) {
-            DEBUG_EVENT_printf("  --> ready for value_handle=%d len=%lu\n", pending_op->value_handle, pending_op->len);
+            DEBUG_printf("  --> ready for value_handle=%d len=%zu\n", pending_op->value_handle, pending_op->len);
             gatt_client_write_value_of_characteristic_without_response(pending_op->conn_handle, pending_op->value_handle, pending_op->len, (uint8_t *)pending_op->buf);
             // Note: Can't "del" the pending_op from IRQ context. Leave it for the GC.
         }
 
     #endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
     } else {
-        DEBUG_EVENT_printf("  --> hci event type: unknown (0x%02x)\n", event_type);
+        DEBUG_printf("  --> hci event type: unknown (0x%02x)\n", event_type);
     }
 }
 
@@ -489,7 +489,7 @@ STATIC void btstack_init_deinit_timeout_handler(btstack_timer_source_t *ds) {
 }
 
 int mp_bluetooth_init(void) {
-    DEBUG_EVENT_printf("mp_bluetooth_init\n");
+    DEBUG_printf("mp_bluetooth_init\n");
 
     if (mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_ACTIVE) {
         return 0;
@@ -538,6 +538,8 @@ int mp_bluetooth_init(void) {
     btstack_run_loop_set_timer_handler(&btstack_init_deinit_timeout, btstack_init_deinit_timeout_handler);
     btstack_run_loop_add_timer(&btstack_init_deinit_timeout);
 
+    DEBUG_printf("mp_bluetooth_init: waiting for stack startup\n");
+
     // Either the HCI event will set state to ACTIVE, or the timeout will set it to TIMEOUT.
     mp_bluetooth_btstack_port_start();
     while (mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_STARTING) {
@@ -547,6 +549,8 @@ int mp_bluetooth_init(void) {
 
     // Check for timeout.
     if (mp_bluetooth_btstack_state != MP_BLUETOOTH_BTSTACK_STATE_ACTIVE) {
+        DEBUG_printf("mp_bluetooth_init: stack startup timed out\n");
+
         // Required to stop the polling loop.
         mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
         // Attempt a shutdown (may not do anything).
@@ -566,7 +570,7 @@ int mp_bluetooth_init(void) {
 }
 
 void mp_bluetooth_deinit(void) {
-    DEBUG_EVENT_printf("mp_bluetooth_deinit\n");
+    DEBUG_printf("mp_bluetooth_deinit\n");
 
     // Nothing to do if not initialised.
     if (!MP_STATE_PORT(bluetooth_btstack_root_pointers)) {
@@ -595,6 +599,8 @@ void mp_bluetooth_deinit(void) {
 
     mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
     MP_STATE_PORT(bluetooth_btstack_root_pointers) = NULL;
+
+    DEBUG_printf("mp_bluetooth_deinit: complete\n");
 }
 
 bool mp_bluetooth_is_active(void) {
@@ -618,7 +624,7 @@ int mp_bluetooth_gap_set_device_name(const uint8_t *buf, size_t len) {
 }
 
 int mp_bluetooth_gap_advertise_start(bool connectable, int32_t interval_us, const uint8_t *adv_data, size_t adv_data_len, const uint8_t *sr_data, size_t sr_data_len) {
-    DEBUG_EVENT_printf("mp_bluetooth_gap_advertise_start\n");
+    DEBUG_printf("mp_bluetooth_gap_advertise_start\n");
     uint16_t adv_int_min = interval_us / 625;
     uint16_t adv_int_max = interval_us / 625;
     uint8_t adv_type = connectable ? 0 : 2;
@@ -654,14 +660,14 @@ int mp_bluetooth_gap_advertise_start(bool connectable, int32_t interval_us, cons
 }
 
 void mp_bluetooth_gap_advertise_stop(void) {
-    DEBUG_EVENT_printf("mp_bluetooth_gap_advertise_stop\n");
+    DEBUG_printf("mp_bluetooth_gap_advertise_stop\n");
     gap_advertisements_enable(false);
     MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data_alloc = 0;
     MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data = NULL;
 }
 
 int mp_bluetooth_gatts_register_service_begin(bool append) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_register_service_begin\n");
+    DEBUG_printf("mp_bluetooth_gatts_register_service_begin\n");
     if (!append) {
         // This will reset the DB.
         // Becase the DB is statically allocated, there's no problem with just re-initing it.
@@ -682,10 +688,10 @@ int mp_bluetooth_gatts_register_service_begin(bool append) {
 
 STATIC uint16_t att_read_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t offset, uint8_t *buffer, uint16_t buffer_size) {
     (void)connection_handle;
-    DEBUG_EVENT_printf("btstack: att_read_callback (handle: %u, offset: %u, buffer: %p, size: %u)\n", att_handle, offset, buffer, buffer_size);
+    DEBUG_printf("btstack: att_read_callback (handle: %u, offset: %u, buffer: %p, size: %u)\n", att_handle, offset, buffer, buffer_size);
     mp_bluetooth_gatts_db_entry_t *entry = mp_bluetooth_gatts_db_lookup(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, att_handle);
     if (!entry) {
-        DEBUG_EVENT_printf("btstack: att_read_callback handle not found\n");
+        DEBUG_printf("btstack: att_read_callback handle not found\n");
         return 0; // TODO: Find status code for not-found.
     }
 
@@ -695,10 +701,10 @@ STATIC uint16_t att_read_callback(hci_con_handle_t connection_handle, uint16_t a
 STATIC int att_write_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size) {
     (void)offset;
     (void)transaction_mode;
-    DEBUG_EVENT_printf("btstack: att_write_callback (handle: %u, mode: %u, offset: %u, buffer: %p, size: %u)\n", att_handle, transaction_mode, offset, buffer, buffer_size);
+    DEBUG_printf("btstack: att_write_callback (handle: %u, mode: %u, offset: %u, buffer: %p, size: %u)\n", att_handle, transaction_mode, offset, buffer, buffer_size);
     mp_bluetooth_gatts_db_entry_t *entry = mp_bluetooth_gatts_db_lookup(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, att_handle);
     if (!entry) {
-        DEBUG_EVENT_printf("btstack: att_write_callback handle not found\n");
+        DEBUG_printf("btstack: att_write_callback handle not found\n");
         return 0; // TODO: Find status code for not-found.
     }
 
@@ -720,7 +726,7 @@ STATIC inline uint16_t get_uuid16(const mp_obj_bluetooth_uuid_t *uuid) {
 }
 
 int mp_bluetooth_gatts_register_service(mp_obj_bluetooth_uuid_t *service_uuid, mp_obj_bluetooth_uuid_t **characteristic_uuids, uint8_t *characteristic_flags, mp_obj_bluetooth_uuid_t **descriptor_uuids, uint8_t *descriptor_flags, uint8_t *num_descriptors, uint16_t *handles, size_t num_characteristics) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_register_service\n");
+    DEBUG_printf("mp_bluetooth_gatts_register_service\n");
     // Note: btstack expects BE UUIDs (which it immediately convertes to LE).
     // So we have to convert all our modbluetooth LE UUIDs to BE just for the att_db_util_add_* methods (using get_uuid16 above, and reverse_128 from btstackutil.h).
 
@@ -764,7 +770,7 @@ int mp_bluetooth_gatts_register_service(mp_obj_bluetooth_uuid_t *service_uuid, m
                 return ret;
             }
         }
-        DEBUG_EVENT_printf("Registered char with handle %u\n", handles[handle_index]);
+        DEBUG_printf("mp_bluetooth_gatts_register_service: Registered char with handle %u\n", handles[handle_index]);
         ++handle_index;
 
         for (size_t j = 0; j < num_descriptors[i]; ++j) {
@@ -782,7 +788,7 @@ int mp_bluetooth_gatts_register_service(mp_obj_bluetooth_uuid_t *service_uuid, m
                 return MP_EINVAL;
             }
             mp_bluetooth_gatts_db_create_entry(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, handles[handle_index], MP_BLUETOOTH_DEFAULT_ATTR_LEN);
-            DEBUG_EVENT_printf("Registered desc with handle %u\n", handles[handle_index]);
+            DEBUG_printf("mp_bluetooth_gatts_register_service: Registered desc with handle %u\n", handles[handle_index]);
             ++descriptor_index;
             ++handle_index;
         }
@@ -792,23 +798,23 @@ int mp_bluetooth_gatts_register_service(mp_obj_bluetooth_uuid_t *service_uuid, m
 }
 
 int mp_bluetooth_gatts_register_service_end(void) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_register_service_end\n");
+    DEBUG_printf("mp_bluetooth_gatts_register_service_end\n");
     att_server_init(att_db_util_get_address(), &att_read_callback, &att_write_callback);
     return 0;
 }
 
 int mp_bluetooth_gatts_read(uint16_t value_handle, uint8_t **value, size_t *value_len) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_read\n");
+    DEBUG_printf("mp_bluetooth_gatts_read\n");
     return mp_bluetooth_gatts_db_read(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, value, value_len);
 }
 
 int mp_bluetooth_gatts_write(uint16_t value_handle, const uint8_t *value, size_t value_len) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_write\n");
+    DEBUG_printf("mp_bluetooth_gatts_write\n");
     return mp_bluetooth_gatts_db_write(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, value, value_len);
 }
 
 int mp_bluetooth_gatts_notify(uint16_t conn_handle, uint16_t value_handle) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_notify\n");
+    DEBUG_printf("mp_bluetooth_gatts_notify\n");
     // Note: btstack doesn't appear to support sending a notification without a value, so include the stored value.
     uint8_t *data = NULL;
     size_t len = 0;
@@ -817,7 +823,7 @@ int mp_bluetooth_gatts_notify(uint16_t conn_handle, uint16_t value_handle) {
 }
 
 int mp_bluetooth_gatts_notify_send(uint16_t conn_handle, uint16_t value_handle, const uint8_t *value, size_t value_len) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_notify_send\n");
+    DEBUG_printf("mp_bluetooth_gatts_notify_send\n");
 
     // Attempt to send immediately. If it succeeds, btstack will copy the buffer.
     MICROPY_PY_BLUETOOTH_ENTER
@@ -825,7 +831,7 @@ int mp_bluetooth_gatts_notify_send(uint16_t conn_handle, uint16_t value_handle,
     MICROPY_PY_BLUETOOTH_EXIT
 
     if (err == BTSTACK_ACL_BUFFERS_FULL) {
-        DEBUG_EVENT_printf("mp_bluetooth_gatts_notify_send: ACL buffer full, scheduling callback\n");
+        DEBUG_printf("mp_bluetooth_gatts_notify_send: ACL buffer full, scheduling callback\n");
         // Schedule callback, making a copy of the buffer.
         mp_btstack_pending_op_t *pending_op = btstack_enqueue_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_NOTIFY, conn_handle, value_handle, value, value_len);
 
@@ -843,7 +849,7 @@ int mp_bluetooth_gatts_notify_send(uint16_t conn_handle, uint16_t value_handle,
 }
 
 int mp_bluetooth_gatts_indicate(uint16_t conn_handle, uint16_t value_handle) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_indicate\n");
+    DEBUG_printf("mp_bluetooth_gatts_indicate\n");
 
     uint8_t *data = NULL;
     size_t len = 0;
@@ -858,7 +864,7 @@ int mp_bluetooth_gatts_indicate(uint16_t conn_handle, uint16_t value_handle) {
     MICROPY_PY_BLUETOOTH_EXIT
 
     if (err == BTSTACK_ACL_BUFFERS_FULL) {
-        DEBUG_EVENT_printf("mp_bluetooth_gatts_indicate: ACL buffer full, scheduling callback\n");
+        DEBUG_printf("mp_bluetooth_gatts_indicate: ACL buffer full, scheduling callback\n");
         // Schedule callback, making a copy of the buffer.
         mp_btstack_pending_op_t *pending_op = btstack_enqueue_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_INDICATE, conn_handle, value_handle, data, len);
 
@@ -876,12 +882,12 @@ int mp_bluetooth_gatts_indicate(uint16_t conn_handle, uint16_t value_handle) {
 }
 
 int mp_bluetooth_gatts_set_buffer(uint16_t value_handle, size_t len, bool append) {
-    DEBUG_EVENT_printf("mp_bluetooth_gatts_set_buffer\n");
+    DEBUG_printf("mp_bluetooth_gatts_set_buffer\n");
     return mp_bluetooth_gatts_db_resize(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, len, append);
 }
 
 int mp_bluetooth_gap_disconnect(uint16_t conn_handle) {
-    DEBUG_EVENT_printf("mp_bluetooth_gap_disconnect\n");
+    DEBUG_printf("mp_bluetooth_gap_disconnect\n");
     gap_disconnect(conn_handle);
     return 0;
 }
@@ -895,7 +901,7 @@ STATIC void scan_duration_timeout_handler(btstack_timer_source_t *ds) {
 }
 
 int mp_bluetooth_gap_scan_start(int32_t duration_ms, int32_t interval_us, int32_t window_us, bool active_scan) {
-    DEBUG_EVENT_printf("mp_bluetooth_gap_scan_start\n");
+    DEBUG_printf("mp_bluetooth_gap_scan_start\n");
 
     if (duration_ms > 0) {
         btstack_run_loop_set_timer(&scan_duration_timeout, duration_ms);
@@ -910,7 +916,7 @@ int mp_bluetooth_gap_scan_start(int32_t duration_ms, int32_t interval_us, int32_
 }
 
 int mp_bluetooth_gap_scan_stop(void) {
-    DEBUG_EVENT_printf("mp_bluetooth_gap_scan_stop\n");
+    DEBUG_printf("mp_bluetooth_gap_scan_stop\n");
     btstack_run_loop_remove_timer(&scan_duration_timeout);
     gap_stop_scan();
     mp_bluetooth_gap_on_scan_complete();
@@ -918,7 +924,7 @@ int mp_bluetooth_gap_scan_stop(void) {
 }
 
 int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr, int32_t duration_ms) {
-    DEBUG_EVENT_printf("mp_bluetooth_gap_peripheral_connect\n");
+    DEBUG_printf("mp_bluetooth_gap_peripheral_connect\n");
 
     uint16_t conn_scan_interval = 60000 / 625;
     uint16_t conn_scan_window = 30000 / 625;
@@ -937,7 +943,7 @@ int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr,
 }
 
 int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle, const mp_obj_bluetooth_uuid_t *uuid) {
-    DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_primary_services\n");
+    DEBUG_printf("mp_bluetooth_gattc_discover_primary_services\n");
     uint8_t err;
     if (uuid) {
         if (uuid->type == MP_BLUETOOTH_UUID_TYPE_16) {
@@ -947,7 +953,7 @@ int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle, const mp_
             reverse_128(uuid->data, buffer);
             err = gatt_client_discover_primary_services_by_uuid128(&btstack_packet_handler_discover_services, conn_handle, buffer);
         } else {
-            DEBUG_EVENT_printf("  --> unknown UUID size\n");
+            DEBUG_printf("  --> unknown UUID size\n");
             return MP_EINVAL;
         }
     } else {
@@ -957,7 +963,7 @@ int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle, const mp_
 }
 
 int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle, const mp_obj_bluetooth_uuid_t *uuid) {
-    DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_characteristics\n");
+    DEBUG_printf("mp_bluetooth_gattc_discover_characteristics\n");
     gatt_client_service_t service = {
         // Only start/end handles needed for gatt_client_discover_characteristics_for_service.
         .start_group_handle = start_handle,
@@ -974,7 +980,7 @@ int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t s
             reverse_128(uuid->data, buffer);
             err = gatt_client_discover_characteristics_for_service_by_uuid128(&btstack_packet_handler_discover_characteristics, conn_handle, &service, buffer);
         } else {
-            DEBUG_EVENT_printf("  --> unknown UUID size\n");
+            DEBUG_printf("  --> unknown UUID size\n");
             return MP_EINVAL;
         }
     } else {
@@ -984,7 +990,7 @@ int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t s
 }
 
 int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle) {
-    DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_descriptors\n");
+    DEBUG_printf("mp_bluetooth_gattc_discover_descriptors\n");
     gatt_client_characteristic_t characteristic = {
         // Only start/end handles needed for gatt_client_discover_characteristic_descriptors.
         .start_handle = start_handle,
@@ -998,12 +1004,12 @@ int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start
 }
 
 int mp_bluetooth_gattc_read(uint16_t conn_handle, uint16_t value_handle) {
-    DEBUG_EVENT_printf("mp_bluetooth_gattc_read\n");
+    DEBUG_printf("mp_bluetooth_gattc_read\n");
     return btstack_error_to_errno(gatt_client_read_value_of_characteristic_using_value_handle(&btstack_packet_handler_read, conn_handle, value_handle));
 }
 
 int mp_bluetooth_gattc_write(uint16_t conn_handle, uint16_t value_handle, const uint8_t *value, size_t *value_len, unsigned int mode) {
-    DEBUG_EVENT_printf("mp_bluetooth_gattc_write\n");
+    DEBUG_printf("mp_bluetooth_gattc_write\n");
 
     // We should be distinguishing between gatt_client_write_value_of_characteristic vs
     // gatt_client_write_characteristic_descriptor_using_descriptor_handle.
@@ -1018,13 +1024,13 @@ int mp_bluetooth_gattc_write(uint16_t conn_handle, uint16_t value_handle, const
         // If possible, this will send immediately, copying the buffer directly to the ACL buffer.
         err = gatt_client_write_value_of_characteristic_without_response(conn_handle, value_handle, *value_len, (uint8_t *)value);
         if (err == GATT_CLIENT_BUSY) {
-            DEBUG_EVENT_printf("mp_bluetooth_gattc_write: client busy\n");
+            DEBUG_printf("mp_bluetooth_gattc_write: client busy\n");
             // Can't send right now, need to take a copy of the buffer and add it to the queue.
             pending_op = btstack_enqueue_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_WRITE_NO_RESPONSE, conn_handle, value_handle, value, *value_len);
             // Notify when this conn_handle can write.
             err = gatt_client_request_can_write_without_response_event(&btstack_packet_handler_generic, conn_handle);
         } else {
-            DEBUG_EVENT_printf("mp_bluetooth_gattc_write: other failure: %d\n", err);
+            DEBUG_printf("mp_bluetooth_gattc_write: other failure: %d\n", err);
         }
     } else if (mode == MP_BLUETOOTH_WRITE_MODE_WITH_RESPONSE) {
         // Pending operation copies the value buffer and keeps a GC reference
diff --git a/extmod/nimble/modbluetooth_nimble.c b/extmod/nimble/modbluetooth_nimble.c
index e51f2747ec..36bfa6cccf 100644
--- a/extmod/nimble/modbluetooth_nimble.c
+++ b/extmod/nimble/modbluetooth_nimble.c
@@ -45,7 +45,7 @@
 #define MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME "MPY NIMBLE"
 #endif
 
-#define DEBUG_EVENT_printf(...) // printf(__VA_ARGS__)
+#define DEBUG_printf(...) // printf("nimble: " __VA_ARGS__)
 
 #define ERRNO_BLUETOOTH_NOT_ACTIVE MP_ENODEV
 
@@ -172,10 +172,12 @@ STATIC void sync_cb(void) {
     }
 
     if (MP_BLUETOOTH_DEFAULT_ATTR_LEN > 20) {
+        DEBUG_printf("sync_cb: Setting MTU\n");
         rc = ble_att_set_preferred_mtu(MP_BLUETOOTH_DEFAULT_ATTR_LEN + 3);
         assert(rc == 0);
     }
 
+    DEBUG_printf("sync_cb: Setting device name\n");
     ble_svc_gap_device_name_set(MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME);
 
     mp_bluetooth_nimble_ble_state = MP_BLUETOOTH_NIMBLE_BLE_STATE_ACTIVE;
@@ -188,12 +190,12 @@ STATIC void gatts_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg) {
     switch (ctxt->op) {
         case BLE_GATT_REGISTER_OP_SVC:
             // Called when a service is successfully registered.
-            DEBUG_EVENT_printf("gatts_register_cb: svc uuid=%p handle=%d\n", &ctxt->svc.svc_def->uuid, ctxt->svc.handle);
+            DEBUG_printf("gatts_register_cb: svc uuid=%p handle=%d\n", &ctxt->svc.svc_def->uuid, ctxt->svc.handle);
             break;
 
         case BLE_GATT_REGISTER_OP_CHR:
             // Called when a characteristic is successfully registered.
-            DEBUG_EVENT_printf("gatts_register_cb: chr uuid=%p def_handle=%d val_handle=%d\n", &ctxt->chr.chr_def->uuid, ctxt->chr.def_handle, ctxt->chr.val_handle);
+            DEBUG_printf("gatts_register_cb: chr uuid=%p def_handle=%d val_handle=%d\n", &ctxt->chr.chr_def->uuid, ctxt->chr.def_handle, ctxt->chr.val_handle);
 
             // Note: We will get this event for the default GAP Service, meaning that we allocate storage for the
             // "device name" and "appearance" characteristics, even though we never see the reads for them.
@@ -207,7 +209,7 @@ STATIC void gatts_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg) {
         case BLE_GATT_REGISTER_OP_DSC:
             // Called when a descriptor is successfully registered.
             // Note: This is event is not called for the CCCD.
-            DEBUG_EVENT_printf("gatts_register_cb: dsc uuid=%p handle=%d\n", &ctxt->dsc.dsc_def->uuid, ctxt->dsc.handle);
+            DEBUG_printf("gatts_register_cb: dsc uuid=%p handle=%d\n", &ctxt->dsc.dsc_def->uuid, ctxt->dsc.handle);
 
             // See above, safe to alloc.
             mp_bluetooth_gatts_db_create_entry(MP_STATE_PORT(bluetooth_nimble_root_pointers)->gatts_db, ctxt->dsc.handle, MP_BLUETOOTH_DEFAULT_ATTR_LEN);
@@ -217,13 +219,13 @@ STATIC void gatts_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg) {
             break;
 
         default:
-            DEBUG_EVENT_printf("gatts_register_cb: unknown op %d\n", ctxt->op);
+            DEBUG_printf("gatts_register_cb: unknown op %d\n", ctxt->op);
             break;
     }
 }
 
 STATIC int gap_event_cb(struct ble_gap_event *event, void *arg) {
-    DEBUG_EVENT_printf("gap_event_cb: type=%d\n", event->type);
+    DEBUG_printf("gap_event_cb: type=%d\n", event->type);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -250,7 +252,7 @@ STATIC int gap_event_cb(struct ble_gap_event *event, void *arg) {
             break;
 
         case BLE_GAP_EVENT_NOTIFY_TX: {
-            DEBUG_EVENT_printf("gap_event_cb: notify_tx: %d %d\n", event->notify_tx.indication, event->notify_tx.status);
+            DEBUG_printf("gap_event_cb: notify_tx: %d %d\n", event->notify_tx.indication, event->notify_tx.status);
             // This event corresponds to either a sent notify/indicate (status == 0), or an indication confirmation (status != 0).
             if (event->notify_tx.indication && event->notify_tx.status != 0) {
                 // Map "done/ack" to 0, otherwise pass the status directly.
@@ -263,7 +265,7 @@ STATIC int gap_event_cb(struct ble_gap_event *event, void *arg) {
 }
 
 int mp_bluetooth_init(void) {
-    DEBUG_EVENT_printf("mp_bluetooth_init\n");
+    DEBUG_printf("mp_bluetooth_init\n");
     // Clean up if necessary.
     mp_bluetooth_deinit();
 
@@ -291,7 +293,7 @@ int mp_bluetooth_init(void) {
     while (mp_bluetooth_nimble_ble_state != MP_BLUETOOTH_NIMBLE_BLE_STATE_ACTIVE) {
         MICROPY_EVENT_POLL_HOOK
     }
-    DEBUG_EVENT_printf("mp_bluetooth_init: ready\n");
+    DEBUG_printf("mp_bluetooth_init: ready\n");
 
     return 0;
 }
@@ -304,7 +306,7 @@ STATIC void ble_hs_shutdown_stop_cb(int status, void *arg) {
 STATIC struct ble_hs_stop_listener ble_hs_shutdown_stop_listener;
 
 void mp_bluetooth_deinit(void) {
-    DEBUG_EVENT_printf("mp_bluetooth_deinit\n");
+    DEBUG_printf("mp_bluetooth_deinit\n");
     if (mp_bluetooth_nimble_ble_state == MP_BLUETOOTH_NIMBLE_BLE_STATE_OFF) {
         return;
     }
@@ -325,7 +327,7 @@ void mp_bluetooth_deinit(void) {
     mp_bluetooth_nimble_port_deinit();
 
     MP_STATE_PORT(bluetooth_nimble_root_pointers) = NULL;
-    DEBUG_EVENT_printf("mp_bluetooth_deinit: shut down\n");
+    DEBUG_printf("mp_bluetooth_deinit: shut down\n");
 }
 
 bool mp_bluetooth_is_active(void) {
@@ -409,7 +411,7 @@ int mp_bluetooth_gap_advertise_start(bool connectable, int32_t interval_us, cons
     if (ret == 0) {
         return 0;
     }
-    DEBUG_EVENT_printf("ble_gap_adv_start: %d\n", ret);
+    DEBUG_printf("ble_gap_adv_start: %d\n", ret);
 
     return ble_hs_err_to_errno(ret);
 }
@@ -421,7 +423,7 @@ void mp_bluetooth_gap_advertise_stop(void) {
 }
 
 static int characteristic_access_cb(uint16_t conn_handle, uint16_t value_handle, struct ble_gatt_access_ctxt *ctxt, void *arg) {
-    DEBUG_EVENT_printf("characteristic_access_cb: conn_handle=%u value_handle=%u op=%u\n", conn_handle, value_handle, ctxt->op);
+    DEBUG_printf("characteristic_access_cb: conn_handle=%u value_handle=%u op=%u\n", conn_handle, value_handle, ctxt->op);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -640,7 +642,7 @@ STATIC void gattc_on_data_available(uint8_t event, uint16_t conn_handle, uint16_
 }
 
 STATIC int gap_scan_cb(struct ble_gap_event *event, void *arg) {
-    DEBUG_EVENT_printf("gap_scan_cb: event=%d type=%d\n", event->type, event->type == BLE_GAP_EVENT_DISC ? event->disc.event_type : -1);
+    DEBUG_printf("gap_scan_cb: event=%d type=%d\n", event->type, event->type == BLE_GAP_EVENT_DISC ? event->disc.event_type : -1);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -681,6 +683,7 @@ int mp_bluetooth_gap_scan_start(int32_t duration_ms, int32_t interval_us, int32_
 }
 
 int mp_bluetooth_gap_scan_stop(void) {
+    DEBUG_printf("mp_bluetooth_gap_scan_stop\n");
     if (!mp_bluetooth_is_active()) {
         return ERRNO_BLUETOOTH_NOT_ACTIVE;
     }
@@ -697,7 +700,7 @@ int mp_bluetooth_gap_scan_stop(void) {
 
 // Central role: GAP events for a connected peripheral.
 STATIC int peripheral_gap_event_cb(struct ble_gap_event *event, void *arg) {
-    DEBUG_EVENT_printf("peripheral_gap_event_cb: event=%d\n", event->type);
+    DEBUG_printf("peripheral_gap_event_cb: event=%d\n", event->type);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -745,6 +748,7 @@ STATIC int peripheral_gap_event_cb(struct ble_gap_event *event, void *arg) {
 }
 
 int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr, int32_t duration_ms) {
+    DEBUG_printf("mp_bluetooth_gap_peripheral_connect\n");
     if (!mp_bluetooth_is_active()) {
         return ERRNO_BLUETOOTH_NOT_ACTIVE;
     }
@@ -770,7 +774,7 @@ int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr,
 }
 
 STATIC int peripheral_discover_service_cb(uint16_t conn_handle, const struct ble_gatt_error *error, const struct ble_gatt_svc *service, void *arg) {
-    DEBUG_EVENT_printf("peripheral_discover_service_cb: conn_handle=%d status=%d start_handle=%d\n", conn_handle, error->status, service ? service->start_handle : -1);
+    DEBUG_printf("peripheral_discover_service_cb: conn_handle=%d status=%d start_handle=%d\n", conn_handle, error->status, service ? service->start_handle : -1);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -799,7 +803,7 @@ int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle, const mp_
 }
 
 STATIC int ble_gatt_characteristic_cb(uint16_t conn_handle, const struct ble_gatt_error *error, const struct ble_gatt_chr *characteristic, void *arg) {
-    DEBUG_EVENT_printf("ble_gatt_characteristic_cb: conn_handle=%d status=%d def_handle=%d val_handle=%d\n", conn_handle, error->status, characteristic ? characteristic->def_handle : -1, characteristic ? characteristic->val_handle : -1);
+    DEBUG_printf("ble_gatt_characteristic_cb: conn_handle=%d status=%d def_handle=%d val_handle=%d\n", conn_handle, error->status, characteristic ? characteristic->def_handle : -1, characteristic ? characteristic->val_handle : -1);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -828,7 +832,7 @@ int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t s
 }
 
 STATIC int ble_gatt_descriptor_cb(uint16_t conn_handle, const struct ble_gatt_error *error, uint16_t characteristic_val_handle, const struct ble_gatt_dsc *descriptor, void *arg) {
-    DEBUG_EVENT_printf("ble_gatt_descriptor_cb: conn_handle=%d status=%d chr_handle=%d dsc_handle=%d\n", conn_handle, error->status, characteristic_val_handle, descriptor ? descriptor->handle : -1);
+    DEBUG_printf("ble_gatt_descriptor_cb: conn_handle=%d status=%d chr_handle=%d dsc_handle=%d\n", conn_handle, error->status, characteristic_val_handle, descriptor ? descriptor->handle : -1);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -850,7 +854,7 @@ int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start
 }
 
 STATIC int ble_gatt_attr_read_cb(uint16_t conn_handle, const struct ble_gatt_error *error, struct ble_gatt_attr *attr, void *arg) {
-    DEBUG_EVENT_printf("ble_gatt_attr_read_cb: conn_handle=%d status=%d handle=%d\n", conn_handle, error->status, attr ? attr->handle : -1);
+    DEBUG_printf("ble_gatt_attr_read_cb: conn_handle=%d status=%d handle=%d\n", conn_handle, error->status, attr ? attr->handle : -1);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
@@ -871,7 +875,7 @@ int mp_bluetooth_gattc_read(uint16_t conn_handle, uint16_t value_handle) {
 }
 
 STATIC int ble_gatt_attr_write_cb(uint16_t conn_handle, const struct ble_gatt_error *error, struct ble_gatt_attr *attr, void *arg) {
-    DEBUG_EVENT_printf("ble_gatt_attr_write_cb: conn_handle=%d status=%d handle=%d\n", conn_handle, error->status, attr ? attr->handle : -1);
+    DEBUG_printf("ble_gatt_attr_write_cb: conn_handle=%d status=%d handle=%d\n", conn_handle, error->status, attr ? attr->handle : -1);
     if (!mp_bluetooth_is_active()) {
         return 0;
     }