Wireless sensor networking is an emerging technology with a wide range of potential applications. They consist of a large number of low-power nodes. These nodes are equipped with sensors, embedded microprocessors and radio transceivers. Therefore, their purpose is not only sensing and processing data, but also passing it on. They communicate over short distances to accomplish a task. Once deployed, the sensor nodes must be able to autonomously organize themselves into a network and work for several years without changing the power supply. OneLab is a federation of testbed owners that enables testing on wireless sensor networks without any financial investment. This paper explains in detail the use of such laboratories, especially the FIT IoT LAB, from creating access accounts, analyzing needs, booking nodes and conducting the experiment itself, to collecting and analyzing data. RPL is a significant protocol for networks of this type. It is a distance vector and source routing protocol. It organizes the topology into a destination oriented acyclic graph. There are 2 modes: storing and non-storing. It uses ICMPv6 control messages: DIS, DAO and DIO. To ensure successful DODAG formation and communication between nodes, it uses a variety of metrics: node state, node power, number of jumps, throughput, waiting time, and connection reliability. In the practical part, the RPL protocol was tested using two operating systems: RIOT and ContikiNG. The problems that are common in wireless sensor networks and their solutions are highlighted. Finally, DODAG is graphically presented using the Foren6 tool, the data obtained is analyzed: node consumption, time required to send packets, and DAO and DIO intervals.