The paper entitled “treNch: Ultra-Low Power Wireless Communication Protocol for IoT and Energy Harvesting“, by F. Moreno-Cruz, V. Toral-López, A. Escobar-Molero, V. U. Ruíz, A. Rivadeneyra, D. P. Morales, has been accepted for publication in the Sensor journal! This paper introduces treNch, a novel WCP implementing the cross-layer principle to use the power input for adapting its operation in a dynamic manner that goes from pure best-effort to nearly real time. Together with the energy-management algorithm, it operates with asynchronous transmissions, synchronous and optional receptions, short frame sizes and a light architecture that gives control to the nodes. These features make treNch an optimal option for wireless sensor networks with ultra-low power demands and severe energy fluctuations. The paper demonstrates through a comparison with different modes of Bluetooth Low Energy (BLE) a decrease of the power consumption in 1 to 2 orders of magnitude for different scenarios at equal quality of service. Moreover, the paper proposes some security optimizations, such as shorter over-the-air counters, to reduce the packet overhead without decreasing the security level. Finally, other features aside of the energy needs are discussed, such as latency, reliability or topology, brought again against BLE.