Commits on Sep 21, 2023

1. events: Move implementation of events::send() to lib/events …

   Events have a global, system-wide sequence number, which must be handled
   atomically, (fetching and incrementing the sequence AND sending the event
   to uORB must be atomic). Currently in FLAT mode, only one instance of this
   sequence number exists, so it is OK to have it in px4_platform.
   
   However, in PROTECTED mode px4_platform is instantiated both in kernel-
   and user spaces, which makes two instances of this sequence number, which
   causes problems in the mavlink event handling logic.
   
   When mavlink receives and handles events, it expects that:
   - The sequence numbers arrive in order (seq n is followed by n+1 etc)
   - It increments by 1
   - There is only one instance of the sequence number
   
   In PROTECTED mode this is violated, as the kernel and user sequence
   numbers run freely on their own. This patch fixes the issue by moving
   the event backend to the kernel and by providing user access to it via
   ioctl.

   

   pussuw committed Sep 21, 2023
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