ok ... I have good news tonight, but still some questions ...
I assumed so far that the following items in my M1054 camera were triggers for alarm recording in Surveillance station :
IOEnabled = "yes"
AudioEnabled = "yes"
TamperingEnabled = "yes"
MotionDetectionEnabled = "yes"
MotionLevelEnabled = "yes"
and so far, I never succeeded to have any alarm recording in surveillance station.
But tonight, I found a way to manually change the state of the input at the rear of my camera, by changing the "Normal State" into this menu on the camera :
Whenever the "Normal state" differs from the "Current State" for the "Input 1", I now get an alarm recording on the synology using the correct "Axis M1054" profile.
What still doesn't seem to work is the "audio" and "Tampering".
PIR sensor doesn't give any option into "triggerdata", so to me, for the moment, PIR is not an option which can trigger an alarm.
"Motion" is I think related to the "Motion Detection" which Surveillance station is supporting, so something different than "Alarm recording"
... So I now need to find out what alarms fro, the 1054 synology supports, as this is nowhere described ... audio ? Tampering ? ...