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Forum Discussion
OTA for CC3200 Corrupted Download file.
We are using dropbox to host update files for a hardware device that uses a cc3200. Last week our devices were no longer able to retrieve a file update file from dropbox. When we test the download it...
Update: we have extended the timeline and are planning to keep the current behavior until at least 3/14.
justindaw wrote:...
You can see that in the file dropbox returns it is appending a few bytes at the front.
...
🙂 Not only at the front, for sure! There are 2 bytes at the end too, at least. May be some more inside.
34 30 30 30 0d 0a 🡓 🡓 🡓 🡓 🡓 🡓 4 0 0 0 CR LF
The above means you have a chunk of data. Chunk size is 4000 Bytes and at the end are 2 more bytes (Carriage return and Line feed). If that chunk is the entire data, that's all. Otherwise follows new chunk's packet - new size (encoded to ASCII digits as in your example) and CR LF pair, actual chunk of data, and ending CR LF pair. The last repeats as many times as need to transfer all data.
Hope this sheds some light on chunked transfer encoding. 😉
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