If you know anything abput rds This would be fairly easy to pull off if the unit was exposed to the public internet.
People you must start using VPN routers.
Its very common for rds data to be sent as udp packets.
Id speculate that this device was fou d on a list similar to thw barix devices in the past. Once you know the type of unit you can get the data format from its manual. Then you just have to send the data to the ip adress in the right format.