UDPSOCKET_ECHOTEST fails if a packet of every size was not sent

[michalpasztamobica]

Description

So far the UDPSOCKET_ECHOTEST could report success if no packets were sent. The only trace of problems was visible in the logs.
It could also report pass if the device was able to send a lot of small packets, but consistently failed with larger ones.
We want to make sure that at least one packet of every size gets sent at least once, so we check if the number of sent packets increased after every loop (it can increase by 1, 2 or 3, depending on how many times the retry loop executes.

Pull request type

[ ] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Docs update
[x] Test update
[ ] Breaking change

Reviewers

@SeppoTakalo
@VeijoPesonen

[ciarmcom]

@michalpasztamobica, thank you for your changes.
@VeijoPesonen @SeppoTakalo @ARMmbed/mbed-os-test @ARMmbed/mbed-os-ipcore @ARMmbed/mbed-os-maintainers please review.

[mbed-ci]

Test run: FAILED

Summary: 3 of 3 test jobs failed
Build number : 2
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_build-IAR
• jenkins-ci/mbed-os-ci_build-GCC_ARM
• jenkins-ci/mbed-os-ci_build-ARM

[michalpasztamobica]

@0xc0170 , is there some CI issue or something wrong with my code or PR?

10:03:32 Scheduling project: mbed-os-ci_build-ARM
Aborted by Martin Kojtal

[0xc0170]

Aborted build, we need CI time for 5.12.2 jobs today. this needs reviews first - it was run by CI trigger, it's now disabled, need manual control for now.

[mbed-ci]

Test run: FAILED

Summary: 3 of 3 test jobs failed
Build number : 3
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_build-IAR
• jenkins-ci/mbed-os-ci_build-GCC_ARM
• jenkins-ci/mbed-os-ci_build-ARM

[VeijoPesonen]

Should be mentioned also in the test specifications to avoid confusion

[michalpasztamobica]

@VeijoPesonen , I amended the documentation, including the sentence on recvfrom(), to express how the test really works.

[adbridge]

ci started

[mbed-ci]

Test run: FAILED

Summary: 1 of 4 test jobs failed
Build number : 4
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_greentea-test

[michalpasztamobica]

The greentea failures are in K66F block storage tests.They are in no way related to my changes. I restarted the greentea job.

[michalpasztamobica]

@SeppoTakalo , your review would be much appreciated :)