This is exposed to allow client reading characteristic values
with known uuid.
---
src/shared/gatt-helpers.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++
src/shared/gatt-helpers.h | 6 +++
2 files changed, 111 insertions(+)
diff --git a/src/shared/gatt-helpers.c b/src/shared/gatt-helpers.c
index 97e62fe..0c3fd34 100644
--- a/src/shared/gatt-helpers.c
+++ b/src/shared/gatt-helpers.c
@@ -1217,6 +1217,111 @@ bool bt_gatt_discover_characteristics(struct bt_att *att,
return true;
}
+static void read_by_type_cb(uint8_t opcode, const void *pdu,
+ uint16_t length, void *user_data)
+{
+ struct discovery_op *op = user_data;
+ bool success;
+ uint8_t att_ecode = 0;
+ size_t data_length;
+ uint16_t last_handle;
+
+ if (opcode == BT_ATT_OP_ERROR_RSP) {
+ att_ecode = process_error(pdu, length);
+
+ if (att_ecode == BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND &&
+ op->result_head)
+ success = true;
+ else
+ success = false;
+
+ goto done;
+ }
+
+ if (opcode != BT_ATT_OP_READ_BY_TYPE_RSP || !pdu) {
+ success = false;
+ att_ecode = 0;
+ goto done;
+ }
+
+ data_length = ((uint8_t *) pdu)[0];
+ if (((length - 1) % data_length)) {
+ success = false;
+ att_ecode = 0;
+ goto done;
+ }
+
+ if (!result_append(opcode, pdu + 1, length - 1, data_length, op)) {
+ success = false;
+ att_ecode = 0;
+ goto done;
+ }
+
+ last_handle = get_le16(pdu + length - data_length);
+ if (last_handle != op->end_handle) {
+ uint8_t pdu[4 + get_uuid_len(&op->uuid)];
+
+ put_le16(last_handle + 1, pdu);
+ put_le16(op->end_handle, pdu + 2);
+ put_uuid_le(&op->uuid, pdu + 4);
+
+ if (bt_att_send(op->att, BT_ATT_OP_READ_BY_TYPE_REQ,
+ pdu, sizeof(pdu),
+ read_by_type_cb,
+ discovery_op_ref(op),
+ discovery_op_unref))
+ return;
+
+ discovery_op_unref(op);
+ success = false;
+ goto done;
+ }
+
+ success = true;
+
+done:
+ if (op->callback)
+ op->callback(success, att_ecode, success ? op->result_head :
+ NULL, op->user_data);
+}
+
+bool bt_gatt_read_by_type(struct bt_att *att, uint16_t start, uint16_t end,
+ const bt_uuid_t *uuid,
+ bt_gatt_discovery_callback_t callback,
+ void *user_data,
+ bt_gatt_destroy_func_t destroy)
+{
+ struct discovery_op *op;
+ uint8_t pdu[4 + get_uuid_len(uuid)];
+
+ if (!att || !uuid || uuid->type == BT_UUID_UNSPEC)
+ return false;
+
+ op = new0(struct discovery_op, 1);
+ if (!op)
+ return false;
+
+ op->att = att;
+ op->callback = callback;
+ op->user_data = user_data;
+ op->destroy = destroy;
+ op->end_handle = end;
+ op->uuid = *uuid;
+
+ put_le16(start, pdu);
+ put_le16(end, pdu + 2);
+ put_uuid_le(uuid, pdu + 4);
+
+ if (!bt_att_send(att, BT_ATT_OP_READ_BY_TYPE_REQ, pdu, sizeof(pdu),
+ read_by_type_cb, discovery_op_ref(op),
+ discovery_op_unref)) {
+ free(op);
+ return false;
+ }
+
+ return true;
+}
+
static void discover_descs_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
diff --git a/src/shared/gatt-helpers.h b/src/shared/gatt-helpers.h
index 07c145d..2cc37c6 100644
--- a/src/shared/gatt-helpers.h
+++ b/src/shared/gatt-helpers.h
@@ -96,3 +96,9 @@ bool bt_gatt_discover_descriptors(struct bt_att *att,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy);
+
+bool bt_gatt_read_by_type(struct bt_att *att, uint16_t start, uint16_t end,
+ const bt_uuid_t *uuid,
+ bt_gatt_discovery_callback_t callback,
+ void *user_data,
+ bt_gatt_destroy_func_t destroy);
--
1.9.3
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