[photon/p1] wlan: make sure to close all sockets when deinitializing WICED connectivity subsystem

[avtolstoy]

Problem

Entering listening mode on Photon and P1 does not invalidate current sockets, while at the same time wlan_restart() will call into WICED to deinitialize LwIP stack, which invalidates netconns that are in use by WICED sockets and our socket layer.

Performing socket actions on a handle that has a reference to invalidated WICED socket/LwIP netconn may cause a crash.

Solution

Make sure to call socket_close_all() in wlan_restart() to avoid getting into this state.

Steps to Test

• wiring/no_fixture: WIFI_15_entering_listening_mode_and_enabling_softap_closes_active_sockets_cleanly

Example App

N/A

References

• [CH78867]

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)