Wireless data transmitter via rs-485 interface?

Question

Data transfer

You need to find a ready-made wireless data transmitter. Data must be transmitted via the RS-485 interface at a distance of 500-600 meters (line of sight) guaranteed, with a delay of 2-5 ms (possible delay should be no more than 20-30 ms). The size of the transmitted data packet is 30-40 bytes. Transfer rate 115200 bps. Purpose: control of the robot in real time.