| Summary: | The establishment of the Underwater Internet of Things (UIoT) and the realization of interconnection between heterogeneous underwater intelligent devices are urgent global challenges. Underwater acoustic networking is the most suitable technology to achieve UIoT for medium to long ranges. This paper presents an underwater Wi-Fi network, called <i>uw</i>-WiFi, that utilizes a master–slave mode architecture. <i>uw</i>-WiFi is dedicated to solving the problem of underwater acoustic networking with limited coverage range and number of nodes. To ensure the reliability of different types of data in the network, a reliable segmentation transmission protocol based on data type is designed. Additionally, on-demand scheduling based on the reservation MAC protocol is developed to solve the channel resource sharing problem. The <i>uw</i>-WiFi system has undergone shallow sea tests, and the experimental results demonstrate that the <i>uw</i>-WiFi network is capable of achieving a network throughput of 500 bps or higher, indicating superior network performance.
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