In closed spaces after a disaster, information gathering using tele-operation of mobile robots is widely studied to minimize damage. One tele-operation method called "Robot Wireless Sensor Networks" that uses wireless LAN and relays has been considered for tele-operation of mobile robots. However, a challenge arises from the risk of mobile robot distress caused by wireless LAN disconnection. To address this, we have discussed a tele-operation method using multi relay with LoRaWAN to prevent mobile robot distress. In this paper, we experimentally confirmed that tele-operation with multi relay using LoRaWAN for command-type tele-operation is possible over long distances of up to 2.0 km, where wireless LAN communication is difficult.
