I am using a F405 FC running Arduplane connected to a Raspi. Communication over pymavlink (heartbeat, mode change,…) are working. The camera/video OSD is configured and working, also the warning messages are shown (e.g. low battery). How do I send a message from raspi to the FC which then appears on the OSD as message? I tried like this (also varying the type of SEVERETY):
Nothing is shown on the OSD. Any ideas?