DroneCAN Servo Actuator ID Equal to Zero

Hello everyone,

I hope this is the right forum to post this question as the old UAVCAN forum is now dedicated to Cyphal and DroneCAN (formerly UAVCAN) is now mainly supported by the Ardupilot developers.

In the DroneCAN ArrayCommand message (command message for servos), is the standard for Actuator ID = 0 to command all servos on the bus? We have observed that Hitec DroneCAN servos behave this way (all servos move if a message on the bus has Actuator ID = 0), but MKS DroneCAN servos do not (Actuator ID = 0 corresponds to the first servo). Is there a standard for DroneCAN that defines what a servo ArrayCommand message with Actuator ID = 0 does?