diff --git a/app/src/ble_data_processer_utils.c b/app/src/ble_data_processer_utils.c
index 3817845..8401c3c 100644
--- a/app/src/ble_data_processer_utils.c
+++ b/app/src/ble_data_processer_utils.c
@@ -5,45 +5,75 @@
 static uint8_t _bletxbuf[BLE_MSG_BUF_SIZE];
 static uint8_t blereportbuf[BLE_MSG_BUF_SIZE];
 
+// PACKET_H1
+// PACKET_H2
+// PACKET_TAIL
+
 void                   bletxbuf_clear() { memset(_bletxbuf, 0, BLE_MSG_BUF_SIZE); }
 hand_acid_ble_proto_t* bletxbuf_get() { return (hand_acid_ble_proto_t*)_bletxbuf; }
 
+static uint8_t compute_sum(uint8_t* data, size_t len) {
+  uint8_t sum = 0;
+  for (size_t i = 0; i < len; i++) {
+    sum += data[i];
+  }
+  return sum;
+}
+
 void send_error_receipt(hand_acid_ble_proto_t* rxpacket, int32_t errorcode) {
   hand_acid_ble_proto_t* txheader = (hand_acid_ble_proto_t*)_bletxbuf;
-  uint16_t               sendlen  = HAND_ACID_BLE_BASE_SIZE + sizeof(txheader->data.errreceipt);
-
+  uint16_t               sendlen  = HAND_ACID_BLE_BASE_SIZE + sizeof(txheader->data.errreceipt) + 2;
+  txheader->h1                    = PACKET_H1;
+  txheader->h2                    = PACKET_H2;
   txheader->cmd                   = rxpacket->cmd;
   txheader->frame_index           = rxpacket->frame_index;
   txheader->frame_type            = kproto_error_receipt;
   txheader->data.errreceipt.ecode = errorcode;
+  // 校验
+  txheader->packetlen    = sendlen;
+  _bletxbuf[sendlen - 2] = compute_sum(_bletxbuf, sendlen - 2);
+  _bletxbuf[sendlen - 1] = PACKET_TAIL;
   zdatachannel_data_send2(_bletxbuf, sendlen);
 }
 
 void send_success_receipt(hand_acid_ble_proto_t* rxpacket) {
   hand_acid_ble_proto_t* txheader = (hand_acid_ble_proto_t*)_bletxbuf;
   uint16_t               sendlen  = HAND_ACID_BLE_BASE_SIZE;
-
-  txheader->cmd         = rxpacket->cmd;
-  txheader->frame_index = rxpacket->frame_index;
-  txheader->frame_type  = kproto_cmd_receipt;
+  txheader->h1                    = PACKET_H1;
+  txheader->h2                    = PACKET_H2;
+  txheader->cmd                   = rxpacket->cmd;
+  txheader->frame_index           = rxpacket->frame_index;
+  txheader->frame_type            = kproto_cmd_receipt;
 
   if (txheader->cmd == kproto_cmd_read_power) {
-    sendlen = HAND_ACID_BLE_BASE_SIZE + sizeof(txheader->data.read_power);
+    sendlen = HAND_ACID_BLE_BASE_SIZE + sizeof(txheader->data.read_power) + 2;
   } else if (txheader->cmd == kproto_cmd_read_version) {
-    sendlen = HAND_ACID_BLE_BASE_SIZE + sizeof(txheader->data.read_version);
+    sendlen = HAND_ACID_BLE_BASE_SIZE + sizeof(txheader->data.read_version) + 2;
   }
+  txheader->packetlen = sendlen;
+
+  // 校验
+  _bletxbuf[sendlen - 2] = compute_sum(_bletxbuf, sendlen - 2);
+  _bletxbuf[sendlen - 1] = PACKET_TAIL;
 
   zdatachannel_data_send2(_bletxbuf, sendlen);
 }
 
 void send_key_event(uint8_t keyid, uint8_t keyevent) {
   static uint8_t         report_index;
-  hand_acid_ble_proto_t* reportpacket   = (hand_acid_ble_proto_t*)blereportbuf;
+  hand_acid_ble_proto_t* reportpacket = (hand_acid_ble_proto_t*)blereportbuf;
+  uint16_t               sendlen      = HAND_ACID_BLE_BASE_SIZE + sizeof(reportpacket->data.key_event) + 2;
+
+  reportpacket->h1                      = PACKET_H1;
+  reportpacket->h2                      = PACKET_H2;
   reportpacket->frame_type              = kproto_report;
   reportpacket->frame_index             = report_index++;
   reportpacket->cmd                     = kproto_report_key_event;
   reportpacket->data.key_event.keyid    = keyid;
   reportpacket->data.key_event.keyevent = keyevent;
+  reportpacket->packetlen               = sendlen;
+  _bletxbuf[sendlen - 2]                = compute_sum(blereportbuf, sendlen - 2);
+  _bletxbuf[sendlen - 1]                = PACKET_TAIL;
 
   zdatachannel_data_send2(blereportbuf,  //
                           HAND_ACID_BLE_BASE_SIZE + sizeof(reportpacket->data.key_event));
diff --git a/protocol b/protocol
index 36ac082..f8920e2 160000
--- a/protocol
+++ b/protocol
@@ -1 +1 @@
-Subproject commit 36ac082e16852c6b5e3ecc7bb36899286191a0e8
+Subproject commit f8920e28dcff342b07ae6abd243c400d59f8de62