bt component: fix bluetooth gatt packets process bugs

1. Add process of prepare write request packets
2. Add process of execute write request packets
3. Add process of reliable write request packets
4. Fix bug of processing read blob request packets
5. Fix bug of processing write request packets
6. Optimize error check and process in stack

components/bt/bluedroid/stack/gatt/include/gatt_int.h

@@ -133,6 +133,16 @@ typedef struct {
     UINT8   reason;
 } tGATT_ERROR;
 
+/* Execute write response structure */
+typedef struct {
+    UINT8   op_code;
+}__attribute__((packed)) tGATT_EXEC_WRITE_RSP;
+
+/* Write request response structure */
+typedef struct {
+    UINT8   op_code;
+}__attribute__((packed)) tGATT_WRITE_REQ_RSP;
+
 /* server response message to ATT protocol
 */
 typedef union {
@@ -329,6 +339,32 @@ typedef struct {
     UINT16               count;
 } tGATT_SRV_LIST_INFO;
 
+/* prepare write queue data */
+typedef struct{
+    //len: length of value
+    tGATT_ATTR16  *p_attr;
+    UINT16 len;
+    UINT8 op_code;
+    UINT16 handle;
+    UINT16 offset;
+    UINT8 value[2];
+}__attribute__((packed)) tGATT_PREPARE_WRITE_QUEUE_DATA;
+
+/* structure to store prepare write packts information */
+typedef struct{
+    //only store prepare write packets which need
+    //to be responded by stack (not by application)
+    BUFFER_Q queue;
+
+    //store the total number of prepare write packets
+    //including that should be responded by stack or by application
+    UINT16 total_num;
+
+    //store application error code for prepare write,
+    //invalid offset && invalid length
+    UINT8 error_code_app;
+}tGATT_PREPARE_WRITE_RECORD;
+
 typedef struct {
     BUFFER_Q        pending_enc_clcb;   /* pending encryption channel q */
     tGATT_SEC_ACTION sec_act;
@@ -362,6 +398,7 @@ typedef struct {
 
     BOOLEAN         in_use;
     UINT8           tcb_idx;
+    tGATT_PREPARE_WRITE_RECORD prepare_write_record;    /* prepare write packets record */
 } tGATT_TCB;