UAVs in military and commercial applications; It plays several important roles in situational awareness, search and rescue, environmental monitoring, and environmental surveillance in natural disasters. Working with a small group of unmanned aerial vehicles has far more advantages than working with a single larger unmanned aerial vehicle. In this study, it is proposed to develop a testbed in which smart algorithms can be tested for mesh UAV network systems outside the communication range of the ground control station. Unlike other multi-UAV systems, it has fully autonomous and ultra-low power calculation features. The hardware design and communication algorithms of the Mesh UAV network system are discussed.