refactor: migrate to Tencent Cloud backend

miniprogram/services/ble.js

@@ -126,8 +126,8 @@ function buildFrame(type, payload) {
   if (payload && payload.length > 0) {
     frame = frame.concat(payload)
   }
-  var checkBytes = frame.slice(2)
-  frame.push(xorChecksum(checkBytes))
+    var checkBytes = frame.slice(0)
+    frame.push(xorChecksum(checkBytes))
   return bytesToBuffer(frame)
 }
 
@@ -140,7 +140,7 @@ function parseFrame(buffer) {
   var type = bytes[3]
   var payload = bytes.slice(4, 4 + len)
   var checksum = bytes[4 + len]
-  var expected = xorChecksum(bytes.slice(2, 4 + len))
+  var expected = xorChecksum(bytes.slice(0, 4 + len))
   if (checksum !== expected) return null
   return { type: type, payload: payload, seq: payload.length > 0 ? payload[payload.length - 1] : 0 }
 }