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Rare concurrency bug in walt-server-httpd #150

Description

@eduble

We observed an issue with two rpi5 VPN nodes having stored wrong values in their EEPROM (e.g. WALT_VPN_MAC=OK instead of a real mac address). The issue is very probably due to an unusual race condition in the code of walt-server-httpd, or in its dependencies.
This code currently relies on gevent to handle concurrency. We might consider porting it to the more popular asyncio framework provided by the standard library.

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