[WI-SUN] Network loses stored certificates after first connect

[felipeLeast]

Description of defect

I've developed a routine in my program that check's for internet connectivity. When some time goes by without response I reset my wi-sun connection, the problem I'm facing is that when I attepmt to disconnect and connect again the WisunInterface on the authentication process I get "no own certificate", after some debuging I've found that the problem lies on the fact that after the certificates load stored certificates from wisun_tasklet_add_stored_certificates it deletes from the list of certificates.

I can see two options to fix this problem:
1- Comment line 498 from wisun_tasklet.c which deletes stored certificates
2- On disconnect delete em free wisun_tasklet_data_ptr, which gives me the possibility to reload my certificates.

Target(s) affected by this defect ?

K64F

Toolchain(s) (name and version) displaying this defect ?

ARM_GCC

What version of Mbed-os are you using (tag or sha) ?

mbed-os 5.15.1

What version(s) of tools are you using. List all that apply (E.g. mbed-cli)

mbed-cli 1.10

How is this defect reproduced ?

On mbed-os-example-mesh-minimal add after:
printf("Connected. IP = %s\n", sockAddr.get_ip_address());

mesh->disconnect();
mesh->connect();
while (NSAPI_ERROR_OK != mesh->get_ip_address(&sockAddr))
    ThisThread::sleep_for(500);
printf("Connected. IP = %s\n", sockAddr.get_ip_address());

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOTRIAGE-2630

[0xc0170]

cc @artokin

[felipeLeast]

Hi @artokin, any comments regarding this issue?

[eriknayan]

I have the same problem here with an STM32WB55 custom board.

I tried removing the certificates and setting them again, but still after the Network Interface disconnects and reconnects back, I get "no own cert" error.

[mikter]

We will start working on this issue sorry for the delay.

[mikter]

@felipeLeast and @eriknayan I created pull request to fix this could you check that is fixes the issue you are having

[felipeLeast]

PR Fixed issue!