feat: 在接收数据前完成一次回调，来完成前端闭环

src/utils/jensen.js

@@ -101,7 +101,7 @@ function Jensen(log, conn) {
   this.onreceive = null;
   this.onerror = null;
 
-  const RECV_BUFF_SIZE = 51200;
+  const RECV_BUFF_SIZE = 8192;
 
   const _check_conn_status = () => {
     if (device?.opened === false) {
@@ -451,6 +451,7 @@ function Jensen(log, conn) {
         startIndex += rst.length;
 
         let msg = rst.message;
+        console.log('seq = ' + msg.sequence);
         // WARN: 接下来怎么整
         let cname = msg.id === FACTORY_RESET ? 'factory-reset' : COMMAND_NAMES[msg.id];
         let heading = [];
@@ -1044,6 +1045,7 @@ Jensen.prototype.getFile = async function (filename, length, ondata, onprogress)
   };
   // this.onreceive = onprogress;
   this._progress_report = {};
+  try { onprogress(0); } catch(e) {}
   this.onreceive = function(recvBytes)
   {
     let percent = Math.floor(recvBytes / length * 100);