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vshymanskyy / TinyGSM

A small Arduino library for GSM modules, that just works
GNU Lesser General Public License v3.0
1.91k stars 713 forks source link

[SIM800] SSL client does not read the data, sent just before socket is closed #166

Open vshymanskyy opened 6 years ago

vshymanskyy commented 6 years ago

This restricts ability to download files / perform REST calls using HTTPS. But, there is a simple workaround:

  1. Tell the server not to disconnect by providing Connection: keep-alive request header.
  2. Ensure your server sends Content-Length header in response.
  3. Safely disconnect client when the full body is received.

Profit.

ianarchbell commented 5 years ago

Hi, first all thanks for the library - works great non-SSL and SLL GET works fine too. However, this workaround doesn't seem to work for the general POST case where the output is chunked. It looks like the first chunk gets read but not the following. Keep-alive makes no difference. You can try any POST to scriptr.io - they all fail as far as I have determined. Output below shows data available but not fully read - in this example the first chunk is 63 bytes - it does read read that but doesn't read the second chunk. By the time http.responseStatusCode() is called the modem is closed and so times out. If you have any another example that shows a POST using SSL with chunked data output I'd be happy to try it. Thanks, Ian.

DATA ACCEPT:1,90 End of post waitResponse

+CIPRXGET: 1,1 modemGetAvailable AT+CIPRXGET=4,1 waitResponse

+CIPRXGET: 4,1,328 waitResponse

OK modemRead AT+CIPRXGET=2,1,63 waitResponse

1, CLOSED

vshymanskyy commented 5 years ago

@ianarchbell unfortunately it looks like a SIM800 bug. I don't know if there is any other workaround, but if someone finds something - we can add it to the library.