This patch implements bt_gatt_read_value, which can be used to read the value of
a characteristic or descriptor.
---
src/shared/gatt-helpers.c | 72 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 70 insertions(+), 2 deletions(-)
diff --git a/src/shared/gatt-helpers.c b/src/shared/gatt-helpers.c
index d02b212..4ba17f1 100644
--- a/src/shared/gatt-helpers.c
+++ b/src/shared/gatt-helpers.c
@@ -852,13 +852,81 @@ bool bt_gatt_discover_descriptors(struct bt_att *att,
return true;
}
+struct read_op {
+ bt_gatt_read_callback_t callback;
+ void *user_data;
+ bt_gatt_destroy_func_t destroy;
+};
+
+static void destroy_read_op(void *data)
+{
+ struct read_op *op = data;
+
+ if (op->destroy)
+ op->destroy(op->user_data);
+
+ free(op);
+}
+
+static void read_cb(uint8_t opcode, const void *pdu, uint16_t length,
+ void *user_data)
+{
+ struct read_op *op = user_data;
+ bool success;
+ uint8_t att_ecode = 0;
+ const uint8_t *value = NULL;
+ uint16_t value_len = 0;
+
+ if (opcode == BT_ATT_OP_ERROR_RSP) {
+ success = false;
+ att_ecode = process_error(pdu, length);
+ goto done;
+ }
+
+ if (opcode != BT_ATT_OP_READ_RSP || (!pdu && length)) {
+ success = false;
+ goto done;
+ }
+
+ success = true;
+ value_len = length;
+ if (value_len)
+ value = pdu;
+
+done:
+ if (op->callback)
+ op->callback(success, att_ecode, value, length, op->user_data);
+}
+
bool bt_gatt_read_value(struct bt_att *att, uint16_t value_handle,
bt_gatt_read_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
- /* TODO */
- return false;
+ struct read_op *op;
+ uint8_t pdu[2];
+
+ if (!att)
+ return false;
+
+ op = new0(struct read_op, 1);
+ if (!op)
+ return false;
+
+ op->callback = callback;
+ op->user_data = user_data;
+ op->destroy = destroy;
+
+ put_le16(value_handle, pdu);
+
+ if (!bt_att_send(att, BT_ATT_OP_READ_REQ, pdu, sizeof(pdu),
+ read_cb, op,
+ destroy_read_op)) {
+ free(op);
+ return false;
+ }
+
+ return true;
}
bool bt_gatt_read_long_value(struct bt_att *att,
--
2.0.0.526.g5318336
--
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