Ok, Just in case I will try an see if ti makes any difference if I do "connect=ON" before... but I think this is not required as the telescope will already be connected in ASIAIR. Just have to wait until it stops raining to open the roof.
In the meantime I did extract the TCP stream sent from Ekos INDI Control Panel to INDI Server when parking the mount as I would like to do using indi_setprop!
The first "PARK" command is in #215 (see attachement)
<newSwitchVector name='TELESCOPE_PARK'>
<oneSwitch
name='PARK'>
On
</oneSwitch>
</newSwitchVector>
And the confirmation in #258
<message device="iEQ" timestamp="2021-04-09T12:37:59" message="[DEBUG] Parking to Az ( 0:00:00) Alt (49:01:00)..."/>
My plan would be to do the same traffic capture when issuing "PARK=On" when using indi_setprop to hopefully understand better what makes the difference in the scenario...