diff --git a/pages/demo/demo.vue b/pages/demo/demo.vue
index f57f0c7..158eb9b 100644
--- a/pages/demo/demo.vue
+++ b/pages/demo/demo.vue
@@ -30,6 +30,8 @@ export default {
       characteristicId2: '',
       lockId: '',
       publicKey: new Uint8Array(16),
+      commKey: new Uint8Array(16),
+      signKey: new Uint8Array(16),
       showList: true,
       number: 1
     }
@@ -82,13 +84,14 @@ export default {
       let authCodeBuffer = new ArrayBuffer(originAuthCodeLen)
       let authCodeBinaryData = new Uint8Array(authCodeBuffer)
 
-      for(let i=0; i < keyId.length; i++){
-        authCodeBinaryData[i] = keyId.charCodeAt(i)
+      for(let i=0; i < authUserId.length; i++){
+        authCodeBinaryData[i] = authUserId.charCodeAt(i)
       }
 
-      for(let i=0; i < authUserId.length; i++){
-        authCodeBinaryData[keyId.length + i] = authUserId.charCodeAt(i)
+      for(let i=0; i < keyId.length; i++){
+        authCodeBinaryData[authUserId.length + i] = keyId.charCodeAt(i)
       }
+
       const number = keyId.length + authUserId.length
       authCodeBinaryData[number + 0] = (nowTime & 0xff000000) >> 24
       authCodeBinaryData[number + 1] = (nowTime & 0xff0000) >> 16
@@ -99,9 +102,11 @@ export default {
         authCodeBinaryData[number + 4 + i] = this.publicKey[i]
       }
 
+      console.log('钥ID', keyId, '用户ID', authUserId, '时间戳', nowTime,'公钥', Array.from(this.publicKey))
       console.log('md5前的数据', Array.from(authCodeBinaryData, byte =>
           byte.toString(10)).join(','))
-      const codeMd5 = md5(authCodeBinaryData)
+      const md5Hex = md5(authCodeBinaryData)
+      const codeMd5 = new Uint8Array(md5Hex.match(/.{1,2}/g).map(byte => parseInt(byte, 16)))
       console.log('md5后的数据', codeMd5, codeMd5.length)
 
       const bufferLength = codeMd5.length + 12 + 107
@@ -156,7 +161,7 @@ export default {
       binaryData[flagNumber] = codeMd5.length
       flagNumber += 1
       for (let i = 0; i < codeMd5.length; i++) {
-        binaryData[flagNumber + i] = codeMd5.charCodeAt(i)
+        binaryData[flagNumber + i] = codeMd5[i]
       }
 
       binaryData[8] = Math.ceil((bufferLength - 12)/16) * 16 / 256
@@ -300,23 +305,32 @@ export default {
             console.log('设备特征值改变')
             console.log(res)
             let binaryData = new Uint8Array(res.value)
-            console.log('ecb解密前的数据', Array.from(binaryData))
-            // 明文
-            if(binaryData[7] === 0x20) {
-              if(binaryData[12] === 48 && binaryData[13] === 144){
-                const publicKey = binaryData.slice(15, 31)
-                console.log('公钥', Array.from(publicKey))
-                that.publicKey = publicKey
+            if(binaryData[0] === 239 && binaryData[1] === 1 && binaryData[2] === 238 && binaryData[3] === 2) {
+              console.log('设备返回的数据', Array.from(binaryData), Array.from(binaryData, byte =>
+                  byte.toString(16)).join(','))
+              // 明文 0x20 SM4事先约定密钥 0x22
+              if(binaryData[7] === 0x20) {
+                if(binaryData[12] === 48 && binaryData[13] === 144){
+                  const publicKey = binaryData.slice(15, 31)
+                  console.log('公钥', Array.from(publicKey))
+                  that.publicKey = publicKey
+                }
+              } else if(binaryData[7] === 0x22) {
+                const cebBinaryData = binaryData.slice(12, binaryData.length - 2)
+                console.log('sm4返回参数', Array.from(cebBinaryData))
+                const key = new Uint8Array(16)
+                for (let i = 0; i < that.lockId.length; i++) {
+                  key[i] = that.lockId.charCodeAt(i)
+                }
+                const decrypted = sm4.decrypt(cebBinaryData, key, { mode: 'ecb', output: 'array' })
+                console.log('ecb解密后的数据', decrypted)
+                if(decrypted[0] === 48 && decrypted[1] === 145) {
+                  that.commKey = decrypted.slice(3, 19)
+                  that.signKey = decrypted.slice(19, 35)
+                  console.log('commKey', Array.from(that.commKey))
+                  console.log('signKey', Array.from(that.signKey))
+                }
               }
-            } else if(binaryData[7] === 0x22) {
-              const cebBinaryData = binaryData.slice(12, 28)
-              console.log('sm4返回参数', Array.from(cebBinaryData))
-              const key = new Uint8Array(16)
-              for (let i = 0; i < that.lockId.length; i++) {
-                key[i] = that.lockId.charCodeAt(i)
-              }
-              const decrypted = sm4.decrypt(cebBinaryData, key, { mode: 'ecb', output: 'array' })
-              console.log('ecb解密后的数据', decrypted)
             }
           })
         }
@@ -359,6 +373,18 @@ export default {
                   }
                   that.showList = false
                   that.notifyBLECharacteristicValueChange()
+                  if(uni.$u.os() === 'android') {
+                    uni.setBLEMTU({
+                      deviceId: that.deviceId,
+                      mtu: 256,
+                      success() {
+                        console.log('mtu设置成功')
+                      },
+                      fail(res) {
+                        console.log('mtu设置失败', res)
+                      }
+                    })
+                  }
                   uni.showToast({
                     title: '数据获取成功',
                     icon: 'none',