Send file to server over CoAP ?

RE: Send file to server over CoAP ?

Achim Kraus — Thu, 16 Feb 2023 17:04:43 GMT

You may check some limits of such a http request. Not that you can't use it for more than say 10k.

RE: Send file to server over CoAP ?

A. Mullot — Thu, 16 Feb 2023 16:37:21 GMT

Actually, I realized that I could also send files through http, once that the device has a LTE or NB-IoT connection. I'm currently investigating this way of doing it, I'll let you know how it goes.

I'm using the https_client sample, and trying to modify the request.

RE: Send file to server over CoAP ?

A. Mullot — Thu, 16 Feb 2023 10:27:47 GMT

Hi,

Thank you for the answer. I'll start by taking a look at this blockwise extension.

Kind regards,

Armand

RE: Send file to server over CoAP ?

Achim Kraus — Thu, 16 Feb 2023 09:52:56 GMT

General, CoAP (RFC 7252) has an extension called "blockwise" (RFC 7959), which sends larger payload in single blocks.

In your case, if you use it for a PUT or POST, you need to test, if that works "reliable" enough. Mainly because many server-side blockwise implementations are only considered for smaller transfers with a couple of blocks, and not for larger ones, which may come with some breaks and resumptions.