fix byte count and delay when writing on serial

[houkhouk]

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PR Description section

Description and dependencies

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Changes

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• Bug fix (non-breaking change which fixes an issue)

Related issue(s)

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• fix byte count verification and add delay when sending through serial link in native HAL

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Developer section

• [Documentation] is up to date with new feature
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QA section

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  🆕 Feature: [Feature] Description...
  🆕 Added: [Feature] Description...
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  🛠️ Fix: [Feature] Description...

[houkhouk]

Assert problem still encountered, PR closed until further fix

[houkhouk]

Ok it's fine. The assert I was getting was due to an odd set-up between the gate, the robus translator and the services. After rebooting everyone, it works.

[nicolas-rabault]

Nice