Sending commands to the debug terminal is done with the /api/v1/debug API call. This also takes a DebugMessage data object payload, carrying the line to be entered at the debug terminal. /api/v1/debug API calls require a debug terminal websocket to the referenced M&C being already opened. The will fail if the websocket for this M&C is not open because this means that also the data connection to the M&C is not present.