MicroPython 客户端未从 Python Server 接收大于 4kb（4096 字节）的文本文件

Question

我在 esp32 板上有一个 micropython 客户端，在 linux 服务器上有一个 Python。我正在尝试将 5.5kb 文本文件从 Python 服务器发送到 MicroPython 客户端。它发送成功，但 MicroPython 客户端没有收到所有数据。代码如下；

Python 服务器：

with open('downloads/%s' % (request_path), 'rb') as f:
    data = f.read()
self.wfile.write(data) #data is 5.5kb

MicroPython 客户端

recvData = sock.read(4096).decode('utf-8').split("\r\n")
print("Response_Received:: %s" % recvData) 
sock.close()

Response_Received:: ['HTTP/1.0 200 OK', 'Server: SimpleHTTP/0.6 Python/3.5.3', 'Date: Sat, 09 Jun 2018 09:29:41 GMT', '', '# Ity: asdasd\n# ksduygfkhsgdkjfksjdhfg\n                kjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy98\n                47y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhs\n                gdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349rio\n                t34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r3\n                49riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkv\n                nvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogijiksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweu\n                oiruy9847y397r349riot34jt;o\n                giji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbs\n                djkvbjcxbvhweioufhoiweuoiruy9847y397\n                r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufh\n                oiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduyg\n                fkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhwei\n                oufhoiweuoiruy9847y397r349riot\n                34jt;ogiji4vuijo4vjlkvnvl;kksduyg\n                fkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhw\n                eioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjd\n                hfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiwe\n                uoiruy9847y397r349riot34jt;ogiji4vuij\n                o4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhwe\n                ioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfk\n                hsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;o\n                giji4vuijo4vjlkvnvl;kksduygfkhsgdk\n                jfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvh\n                weioufhoiweuoiruy9847y397r349riot34jt;ogiji\n                4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiru\n                y9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;k4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduyg\n                fkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcx\n                bvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhs\n                gdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdj\n                nvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogijiksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9bfkjcbsdjkvbjcxbvhweioufhoi847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweu\nnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogijiksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweu\nnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogijiksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufhoiweuoiruy9847y397r349riot34jt;ogiji4vuijo4vjlkvnvl;kksduygfkhsgdkjfksjdhfgkjdhsbfkjdhsbfkjcbsdjkvbjcxbvhweioufnvl;k']

由于缓冲区大小（4096），客户端仅接收到 4140 字节的数组数据，recvData 的第 4 个元素丢失。 MicroPython 不接受超过此缓冲区大小。如何在 recvData 数组的第 4 个元素中接收所有数据 (5.5kb) 而不会丢失？

我曾尝试对接收到的数据进行分片，但没有成功。

while True: 
    chunck = s.recv(4096)
    if not chunck: 
        break
    fragments.append(chunck)

Answer 1

由于您的目标是将文件写入文件系统，因此最简单的解决方案是停止尝试将整个文件保存在内存中。无需构建 fragments 数组，只需将接收到的块写入文件即可：

with open('datafile', 'w') as fd:
  while True: 
      chunk = s.recv(4096)
      if not chunk: 
          break
      fd.write(chunk)

这需要一定数量的内存，可以用来接收 任意大小的文件。