Improve Improv-wifi

[Ellerbach]

Description

Improve Improv-wifi

Motivation and Context

• As NetwokHelper only allows 1 setup, adjust the sample so it can work with multiple tries.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a sample)
• Bug fix (fixes an issue with a current sample)
• New Sample (adds a new sample)
• Config and build (change in the configuration and build system, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.