1.解决其他设备无法接受回调问题

2.解决设备分包返回数据，解析问题

pages/demo/demo.vue

@@ -265,7 +265,8 @@ export default {
       console.log('未加工的数据', Array.from(Uint8ArrayData))
 
       for(let i = 0; i < Math.ceil(data.byteLength / 20); i++){
-        let buffer = new ArrayBuffer(20)
+        let length = i === (Math.ceil(data.byteLength / 20)-1)?data.byteLength%20:20
+        let buffer = new ArrayBuffer(length)
         let binaryData = new Uint8Array(buffer)
         for(let j = 0; j < 20; j++){
           if(i * 20 + j < data.byteLength){
@@ -277,7 +278,7 @@ export default {
           serviceId: that.serviceId,
           characteristicId: that.characteristicId2,
           value: buffer,
-          success(write) {
+          success() {
             const hexString = Array.from(binaryData, byte =>
                 byte.toString(10)).join(',')
             console.log('写入的数据', hexString)
@@ -290,9 +291,38 @@ export default {
         })
       }
     },
+    // 解析特征值返回数据
+    parsingdata(binaryData) {
+      const that = this
+      // 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))
+        }
+      }
+    },
     // 监听特征值变化
     notifyBLECharacteristicValueChange() {
       const that = this
+      let completeData
+      let length
       uni.notifyBLECharacteristicValueChange({
         state: true,
         deviceId: that.deviceId,
@@ -308,27 +338,21 @@ export default {
             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
+              length = binaryData[8] * 256 + binaryData[9]
-              if(binaryData[7] === 0x20) {
+              if(length + 14 > binaryData.length) {
-                if(binaryData[12] === 48 && binaryData[13] === 144){
+                completeData = binaryData
-                  const publicKey = binaryData.slice(15, 31)
+              } else {
-                  console.log('公钥', Array.from(publicKey))
+                that.parsingdata(binaryData)
-                  that.publicKey = publicKey
+              }
-                }
+            } else {
-              } else if(binaryData[7] === 0x22) {
+              if(completeData.length > 0) {
-                const cebBinaryData = binaryData.slice(12, binaryData.length - 2)
+                const combinedArray = new Uint8Array(completeData.length + binaryData.length)
-                console.log('sm4返回参数', Array.from(cebBinaryData))
+                combinedArray.set(completeData, 0);
-                const key = new Uint8Array(16)
+                combinedArray.set(binaryData, completeData.length)
-                for (let i = 0; i < that.lockId.length; i++) {
+                completeData = combinedArray
-                  key[i] = that.lockId.charCodeAt(i)
+                if(length + 14 === completeData.length) {
-                }
+                  that.parsingdata(completeData)
-                const decrypted = sm4.decrypt(cebBinaryData, key, { mode: 'ecb', output: 'array' })
+                  completeData = new Uint8Array(0)
-                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))
                 }
               }
             }
@@ -373,18 +397,6 @@ 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',