Hi @stepic7, welcome to the RAK forum.
RAK7200 by default is configured to work as Lorawan end node. If you want it to work as a Lora device with your own way or protocol, you need to write and upload your own firmware.
It is based on a SiP device named S76G. It has an integrated stm32 and a lora transeiver. You can work on stm32 firmware. Or you can check this arduino port, it has an example of TX and RX ping-pong mode https://github.com/lewisxhe/Acsip-S7xG-Library.
Regarding Wifi, you need your Lora RX to be controlled by a wifi device like esp8266/esp32 so you can get your data via smartphone.