Hi,
I'm using the gatt_dm library in NCS v2.2.0 to manage service discovery for a project. The first connection is discovered correctly, without any issue. After that discovery process finishes and the device disconnects, I attempt to reconnect and rediscover services, but I get the error "No space for a UUID," followed by "The discovery procedure failed, err -12".
I'm not sure where I'm going wrong, I'm calling bt_gatt_dm_data_release(dm) and bt_gatt_dm_continue(dm, NULL) any time the discover_completed callback returns. They both report success. Here are a few sections of my code, but I can upload a full example project too if that works better.
static void discover_completed(struct bt_gatt_dm *dm, void *ctx)
{
char uuid_str[37];
const struct bt_gatt_dm_attr *gatt_service_attr =
bt_gatt_dm_service_get(dm);
const struct bt_gatt_service_val *gatt_service =
bt_gatt_dm_attr_service_val(gatt_service_attr);
int err = 0;
//decide to continue parsing or return
if(discovery_mode == PAIRING){
//Check if service is DIS (for serial) or PERIPHERAL (for group #)
//bt_uuid_cmp returns 0 if match. so, return if !(!dis || !peripheral)
//ie, dis && peripheral
if(bt_uuid_cmp(gatt_service->uuid, BT_UUID_DIS) &&
bt_uuid_cmp(gatt_service->uuid, PERIPHERAL_UUID))
{
err = bt_gatt_dm_data_release(dm);
NOTIFY_IF_ERR(err);
err = bt_gatt_dm_continue(dm, NULL);
NOTIFY_IF_ERR(err);
return;
}
}
if(discovery_mode == GROUP){
if(bt_uuid_cmp(gatt_service->uuid, PERIPHERAL_UUID)){
err = bt_gatt_dm_data_release(dm);
NOTIFY_IF_ERR(err);
err = bt_gatt_dm_continue(dm, NULL);
NOTIFY_IF_ERR(err);
return;
}
}
uint8_t characteristic_arr[] = {0, 0};
characteristic_arr[1] = characteristic & 0xFF;
characteristic_arr[0] = characteristic >> 8;
struct bt_uuid * uuid = CUSTOM_UUID(characteristic_arr[0], characteristic_arr[1]);
bt_uuid_to_str(uuid, uuid_str, sizeof(uuid_str));
LOG_DBG("Looking for characteristic %s", uuid_str);
const struct bt_gatt_dm_attr *attr = NULL;
while (NULL != (attr = bt_gatt_dm_attr_next(dm, attr))) {
bt_uuid_to_str(attr->uuid, uuid_str, sizeof(uuid_str));
LOG_DBG("Found characteristic %s", uuid_str);
//Check UUIDs and handle their handles accordingly
if(!bt_uuid_cmp(attr->uuid, SERIAL_UUID)){
LOG_DBG("Serial UUID detected!");
serial_handle = attr->handle;
}
if(!bt_uuid_cmp(attr->uuid, GROUP_UUID)){
LOG_DBG("Group UUID detected!");
group_num_handle = attr->handle;
}
if(!bt_uuid_cmp(attr->uuid, uuid)){
LOG_DBG("Specific characteristic detected!");
characteristic_handle = attr->handle;
}
}
//Serial read request, followed by group write request, happens when DM is
// complete, in discover_service_not_found.
err = bt_gatt_dm_data_release(dm);
NOTIFY_IF_ERR(err);
err = bt_gatt_dm_continue(dm, NULL);
NOTIFY_IF_ERR(err);
LOG_DBG("Returning! %d", __LINE__);
}
static void discover_service_not_found(struct bt_conn *conn, void *ctx)
{
LOG_DBG("Service discovery all done.");
int err = 0;
if(discovery_mode == PAIRING){
serial_read_params.single.handle = serial_handle;
err = bt_gatt_read(peripheral_conn, &serial_read_params);
}
else if(discovery_mode == GROUP){
if(characteristic_handle == 0xFFFF){
notify_error_disconnect(controller_conn, -ENOENT, __LINE__);
}
err = characteristic_write(conn, characteristic_handle, value, write_characteristic_cb);
}
NOTIFY_IF_ERR(err);
}
static void discover_error_found(struct bt_conn *conn, int err, void *ctx)
{
LOG_ERR("The discovery procedure failed, err %d\n", err);
}
static struct bt_gatt_dm_cb discover_serial_cb = {
.completed = discover_completed,
.service_not_found = discover_service_not_found,
.error_found = discover_error_found,
};
static void connected(struct bt_conn *conn, uint8_t conn_err)
{
LOG_INF("Connected!");
if(conn == peripheral_conn){
if(conn_err){
LOG_ERR("Connection failed: %d",conn_err);
bt_conn_unref(peripheral_conn);
peripheral_conn = NULL;
bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE);
return;
}
// ie, peripheral device - start discovery of serial number.
int err = bt_gatt_dm_start(conn, NULL, &discover_serial_cb, NULL);
NOTIFY_IF_ERR(err);
}
else{
if(conn_err){
LOG_ERR("Connection failed: %d",conn_err);
bt_conn_unref(controller_conn);
controller_conn = NULL;
return;
}
controller_conn = bt_conn_ref(conn);
}
}
I also changed the gatt_dm log level to DBG, and put a few print statements in uuid_store to see what addresses it's allocating for the UUID buffer. I noticed that the pointers only increase and don't reset with the new connection, making me think k_free isn't being called where it should be.
I: Filters matched. Address: F64171FB4147, connectable: yes, mode: 2 I: Connected! D: Attr: handle 1 D: Attr store, pos: 0, handle: 1 D: Service detected, handles range: <2, 9> D: Size: 4 D: Buffer: 536904496 D: Starting descriptors discovery D: Attr: handle 2 D: Attr store, pos: 1, handle: 2 D: Attr: handle 3 D: Attr store, pos: 2, handle: 3 D: Attr: handle 4 D: Attr store, pos: 3, handle: 4 D: Attr: handle 5 D: Attr store, pos: 4, handle: 5 D: Attr: handle 6 D: Attr store, pos: 5, handle: 6 D: Attr: handle 7 D: Attr store, pos: 6, handle: 7 D: Attr: handle 8 D: Attr store, pos: 7, handle: 8 D: Attr: handle 9 D: Attr store, pos: 8, handle: 9 D: NULL attribute D: Starting characteristic discovery D: Attr: handle 2 D: Size: 4 D: Buffer: 536904564 D: Attr: handle 4 D: Size: 4 D: Buffer: 536904568 D: Attr: handle 6 D: Size: 4 D: Buffer: 536904572 D: Attr: handle 8 D: Size: 4 D: Buffer: 536904576 D: NULL attribute D: Discovery complete. D: Attr memory release D: Returning! 287 D: Attr: handle 10 D: Attr store, pos: 0, handle: 10 D: Empty service detected with handle: 10 D: Size: 4 D: Buffer: 536904496 D: Discovery complete. D: Attr memory release D: Returning! 287 D: Attr: handle 11 D: Attr store, pos: 0, handle: 11 D: Service detected, handles range: <12, 14> D: Size: 4 D: Buffer: 536904496 D: Starting descriptors discovery D: Attr: handle 12 D: Attr store, pos: 1, handle: 12 D: Attr: handle 13 D: Attr store, pos: 2, handle: 13 D: Attr: handle 14 D: Attr store, pos: 3, handle: 14 D: NULL attribute D: Starting characteristic discovery D: Attr: handle 12 D: Size: 17 D: Buffer: 536904536 D: NULL attribute D: Discovery complete. D: Attr memory release D: Returning! 287 D: Attr: handle 15 D: Attr store, pos: 0, handle: 15 D: Service detected, handles range: <16, 42> D: Size: 17 D: Buffer: 536904496 D: Starting descriptors discovery D: Attr: handle 16 D: Attr store, pos: 1, handle: 16 D: Attr: handle 17 D: Attr store, pos: 2, handle: 17 D: Attr: handle 18 D: Attr store, pos: 3, handle: 18 D: Attr: handle 19 D: Attr store, pos: 4, handle: 19 D: Attr: handle 20 D: Attr store, pos: 5, handle: 20 D: Attr: handle 21 D: Attr store, pos: 6, handle: 21 D: Attr: handle 22 D: Attr store, pos: 7, handle: 22 D: Attr: handle 23 D: Attr store, pos: 8, handle: 23 D: Attr: handle 24 D: Attr store, pos: 9, handle: 24 D: Attr: handle 25 D: Attr store, pos: 10, handle: 25 D: Attr: handle 26 D: Attr store, pos: 11, handle: 26 D: Attr: handle 27 D: Attr store, pos: 12, handle: 27 D: Attr: handle 28 D: Attr store, pos: 13, handle: 28 D: Attr: handle 29 D: Attr store, pos: 14, handle: 29 D: Attr: handle 30 D: Attr store, pos: 15, handle: 30 D: Attr: handle 31 D: Attr store, pos: 16, handle: 31 D: Attr: handle 32 D: Attr store, pos: 17, handle: 32 D: Attr: handle 33 D: Attr store, pos: 18, handle: 33 D: Attr: handle 34 D: Attr store, pos: 19, handle: 34 D: Attr: handle 35 D: Attr store, pos: 20, handle: 35 D: Attr: handle 36 D: Attr store, pos: 21, handle: 36 D: Attr: handle 37 D: Attr store, pos: 22, handle: 37 D: Attr: handle 38 D: Attr store, pos: 23, handle: 38 D: Attr: handle 39 D: Attr store, pos: 24, handle: 39 D: Attr: handle 40 D: Attr store, pos: 25, handle: 40 D: Attr: handle 41 D: Attr store, pos: 26, handle: 41 D: Attr: handle 42 D: Attr store, pos: 27, handle: 42 D: NULL attribute D: Starting characteristic discovery D: Attr: handle 16 D: Size: 17 D: Buffer: 536905000 D: Attr: handle 18 D: Size: 17 D: Buffer: 536905020 D: Attr: handle 20 D: Size: 17 D: Buffer: 536905040 D: Attr: handle 22 D: Size: 17 D: Buffer: 536905060 D: Attr: handle 24 D: Size: 17 D: Buffer: 536905080 D: Attr: handle 26 D: Size: 17 D: Buffer: 536905124 D: Attr: handle 28 D: Size: 17 D: Buffer: 536905144 D: Attr: handle 30 D: Size: 17 D: Buffer: 536905164 D: Attr: handle 32 D: Size: 17 D: Buffer: 536905184 D: Attr: handle 34 D: Size: 17 D: Buffer: 536905204 D: Attr: handle 36 D: Size: 17 D: Buffer: 536905252 D: Attr: handle 38 D: Size: 17 D: Buffer: 536905272 D: Attr: handle 40 D: Size: 17 D: Buffer: 536905292 D: NULL attribute D: Discovery complete. D: Looking for characteristic 00000000-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 00001522-5948-4f3b-9e29-95c3322d9d6c D: Group UUID detected! D: Found characteristic 2803 D: Found characteristic 00001526-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 00001527-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 00001528-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 0000152a-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 0000152b-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 0000152c-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 0000152d-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 0000152e-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 0000152f-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 00001529-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 00001530-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 00001531-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2902 D: Attr memory release D: Returning! 341 D: Attr: handle 43 D: Attr store, pos: 0, handle: 43 D: Service detected, handles range: <44, 65535> D: Size: 4 D: Buffer: 536904496 D: Starting descriptors discovery D: Attr: handle 44 D: Attr store, pos: 1, handle: 44 D: Attr: handle 45 D: Attr store, pos: 2, handle: 45 D: Attr: handle 46 D: Attr store, pos: 3, handle: 46 D: Attr: handle 47 D: Attr store, pos: 4, handle: 47 D: Attr: handle 48 D: Attr store, pos: 5, handle: 48 D: Attr: handle 49 D: Attr store, pos: 6, handle: 49 D: Attr: handle 50 D: Attr store, pos: 7, handle: 50 D: Attr: handle 51 D: Attr store, pos: 8, handle: 51 D: Attr: handle 52 D: Attr store, pos: 9, handle: 52 D: Attr: handle 53 D: Attr store, pos: 10, handle: 53 D: NULL attribute D: Starting characteristic discovery D: Attr: handle 44 D: Size: 4 D: Buffer: 536904580 D: Attr: handle 46 D: Size: 4 D: Buffer: 536904584 D: Attr: handle 48 D: Size: 4 D: Buffer: 536904588 D: Attr: handle 50 D: Size: 4 D: Buffer: 536904592 D: Attr: handle 52 D: Size: 4 D: Buffer: 536904596 D: NULL attribute D: Discovery complete. D: Looking for characteristic 00000000-5948-4f3b-9e29-95c3322d9d6c D: Found characteristic 2803 D: Found characteristic 2a29 D: Found characteristic 2803 D: Found characteristic 2a24 D: Found characteristic 2803 D: Found characteristic 2a25 D: Serial UUID detected! D: Found characteristic 2803 D: Found characteristic 2a27 D: Found characteristic 2803 D: Found characteristic 2a26 D: Attr memory release D: Discover complete. No service found. D: Attr memory release D: Service discovery all done. D: Returning! 341 D: Received serial number P-L2C-000000001 on address F64171FB4147 I: Stored new serial mapping. I: Group number sent. I: Disconnected: (reason 22) I: Disconnected from peripheral. D: Setting PSR value to 0x1 I: Disconnected: (reason 22) I: Disconnected from controller. W: opcode 0x200a status 0x09 // Here is where the second connection attempt starts. I: Connected! I: Running packet_rx_cb... I: Packet received! D: PAIRING packet contents: Address F64171FB4147, group num 1 I: Filters matched. Address: F64171FB4147, connectable: yes, mode: 2 I: Connected! D: Attr: handle 1 D: Attr store, pos: 0, handle: 1 D: Service detected, handles range: <2, 9> D: Size: 4 D: Buffer: 536904608 D: Starting descriptors discovery D: Attr: handle 2 D: Attr store, pos: 1, handle: 2 D: Attr: handle 3 D: Attr store, pos: 2, handle: 3 D: Attr: handle 4 D: Attr store, pos: 3, handle: 4 D: Attr: handle 5 D: Attr store, pos: 4, handle: 5 D: Attr: handle 6 D: Attr store, pos: 5, handle: 6 D: Attr: handle 7 D: Attr store, pos: 6, handle: 7 D: Attr: handle 8 D: Attr store, pos: 7, handle: 8 D: Attr: handle 9 D: Attr store, pos: 8, handle: 9 D: NULL attribute D: Starting characteristic discovery D: Attr: handle 2 D: Size: 4 D: Buffer: 536904676 D: Attr: handle 4 D: Size: 4 D: Buffer: 536904680 D: Attr: handle 6 D: Size: 4 D: Buffer: 536904684 D: Attr: handle 8 D: Size: 4 D: Buffer: 536904688 D: NULL attribute D: Discovery complete. D: Attr memory release D: Returning! 287 D: Attr: handle 10 D: Attr store, pos: 0, handle: 10 D: Empty service detected with handle: 10 D: Size: 4 D: Buffer: 536904608 D: Discovery complete. D: Attr memory release D: Returning! 287 D: Attr: handle 11 D: Attr store, pos: 0, handle: 11 D: Service detected, handles range: <12, 14> D: Size: 4 D: Buffer: 536904608 D: Starting descriptors discovery D: Attr: handle 12 D: Attr store, pos: 1, handle: 12 D: Attr: handle 13 D: Attr store, pos: 2, handle: 13 D: Attr: handle 14 D: Attr store, pos: 3, handle: 14 D: NULL attribute D: Starting characteristic discovery D: Attr: handle 12 D: Size: 17 D: Buffer: 536904648 D: NULL attribute D: Discovery complete. D: Attr memory release D: Returning! 287 D: Attr: handle 15 D: Attr store, pos: 0, handle: 15 D: Service detected, handles range: <16, 42> D: Size: 17 D: Buffer: 536904608 D: Starting descriptors discovery D: Attr: handle 16 D: Attr store, pos: 1, handle: 16 D: Attr: handle 17 D: Attr store, pos: 2, handle: 17 D: Attr: handle 18 D: Attr store, pos: 3, handle: 18 D: Attr: handle 19 D: Attr store, pos: 4, handle: 19 D: Attr: handle 20 D: Attr store, pos: 5, handle: 20 D: Attr: handle 21 D: Attr store, pos: 6, handle: 21 D: Attr: handle 22 D: Attr store, pos: 7, handle: 22 D: Attr: handle 23 D: Attr store, pos: 8, handle: 23 D: Attr: handle 24 D: Attr store, pos: 9, handle: 24 D: Attr: handle 25 D: Attr store, pos: 10, handle: 25 D: Attr: handle 26 D: Attr store, pos: 11, handle: 26 D: Attr: handle 27 D: Attr store, pos: 12, handle: 27 D: Attr: handle 28 D: Attr store, pos: 13, handle: 28 D: Attr: handle 29 D: Attr store, pos: 14, handle: 29 D: Attr: handle 30 D: Attr store, pos: 15, handle: 30 D: Attr: handle 31 D: Attr store, pos: 16, handle: 31 D: Attr: handle 32 D: Attr store, pos: 17, handle: 32 D: Attr: handle 33 D: Attr store, pos: 18, handle: 33 D: Attr: handle 34 D: Attr store, pos: 19, handle: 34 D: Attr: handle 35 D: Attr store, pos: 20, handle: 35 D: Attr: handle 36 D: Attr store, pos: 21, handle: 36 D: Attr: handle 37 D: Attr store, pos: 22, handle: 37 D: Attr: handle 38 D: Attr store, pos: 23, handle: 38 D: Attr: handle 39 D: Attr store, pos: 24, handle: 39 D: Attr: handle 40 D: Attr store, pos: 25, handle: 40 D: Attr: handle 41 D: Attr store, pos: 26, handle: 41 D: Attr: handle 42 D: Attr store, pos: 27, handle: 42 D: NULL attribute D: Starting characteristic discovery D: Attr: handle 16 D: Size: 17 D: Buffer: 536905112 D: Attr: handle 18 D: Size: 17 D: Buffer: 536905132 D: Attr: handle 20 D: Size: 17 D: Buffer: 536905152 D: Attr: handle 22 D: Size: 17 D: Buffer: 536905172 D: Attr: handle 24 D: Size: 17 D: Buffer: 536905192 D: Attr: handle 26 D: Size: 17 D: Buffer: 536905236 D: Attr: handle 28 D: Size: 17 D: Buffer: 536905256 D: Attr: handle 30 D: Size: 17 D: Buffer: 536905276 D: Attr: handle 32 D: Size: 17 D: Buffer: 536905296 D: Attr: handle 34 D: Size: 17 D: Buffer: 536905316 D: Attr: handle 36 D: Size: 17 D: Buffer: 0 E: No space for a UUID. D: Attr memory release E: The discovery procedure failed, err -12
Using Nordic Connect SDK v2.2.0 with VSCode on nRF52832 dev kit PCA10040 3.0.0.
Thank you, and let me know if there's any other information I can provide to assist in debugging this problem.
Ella
