dronecan: esc: change UAVCAN_ESC_IFACE to 2 to default to only outputting on CAN2

Author: dakejahl

docs/en/dronecan/index.md

@@ -270,6 +270,8 @@ PX4 DroneCAN parameters:
 
 [DroneCAN ESCs and servos](../dronecan/escs.md) require the [motor order and servo outputs](../config/actuators.md) to be configured.
 
+Select the CAN interface you want to output the ESC data on. By default CAN2 is selected. [UAVCAN_ESC_IFACE](../advanced_config/parameter_reference.md#UAVCAN_ESC_IFACE)
+
 ## QGC CANNODE Parameter Configuration
 
 QGroundControl can inspect and modify parameters belonging to CAN devices attached to the flight controller, provided the device are connected to the flight controller before QGC is started.
@@ -307,7 +309,7 @@ If successful, the firmware binary will be removed from the root directory and t
 
 **Q**: The motors aren't spinning when armed.
 
-**A**: Make sure `UAVCAN_ENABLE` is set to `3` to enable DroneCAN ESC output.
+**A**: Make sure `UAVCAN_ENABLE` is set to `3` to enable DroneCAN ESC output. Make sure `UAVCAN_ESC_IFACE` is set to the interface you're using.
 
 ---
 

src/drivers/uavcan/module.yaml

@@ -20,7 +20,7 @@ parameters:
         5: CAN6
         6: CAN7
         7: CAN8
-      default: 255
+      default: 2
       min: 1
       max: 255
       reboot_required: true