No mbedTLS server support

[sherrellbc]

Description

• Type: Enhancement | Question
• Priority: Major

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Enhancement

It does not appear to be possible to host an mbedTLS SSL server on mbed-os. I found this example on the mbedTLS Github page, but the code was written assuming a UNIX platform.
Similarly, there are no server examples over at mbed-os-example-tls.

After searching around a bit I have found the following:

• tls.mbed
• developer.mbed
• developer.mbed

All pointing to there not being any server support for mbedTLS on mbed-os.

A majority of the functionality necessary for implementing a server seems to be available in net_sockets.c. Specifically, of course, bind and accept. However, due to the MBEDTLS_NET_C macro being undefined, essentially the entire file is excluded at compile-time. However, according to the documentation for this macro, it seems server support can be had with a little support from the platform.

Am I overlooking mbedTLS server support or is it currently unimplemented. If unimplemented, is it planned?

[0xc0170]

Does ARMmbed/mbed-os-example-tls#98 (comment) answer your question?

[ciarmcom]

ARM Internal Ref: IOTSSL-2333

[simonbutcher]

Mbed TLS should support being a server on Mbed OS, although we don't have a sample for it. Being a server in an embedded or IOT device isn't always a great choice, as it requires being on all the time (no good for battery powered or low power devices) and could be susceptible to attack by other entities on it's network, as it's always listening.

I'll take this as a feature request, and we'll consider adding an Mbed OS sample application.

[simonbutcher]

I've raised this as a feature request on the TLS example app, so I think this issue can now be closed.