## 5 Experimental Part
### Experimental Results of Network Layer Protocols  
In these tests, once again, a modern network emulator was utilized. For data exchange within the network, a protocol stack consisting of the flooding network protocol and the DACAP link layer protocol was employed. The schematic of data packet movement within the network is illustrated in Figure 19.  
The metrics for the data transmission are shown in Figure 20. These metrics are generalized for the transmission path from node M3 to M1. Considering this, the average data transmission time amounted to 6.7 s, with an average transmission rate of 7 bytes per second.  
Thus, the flooding network protocol allows for indirect packet transmission within the network through intermediate nodes. The time and the number of packets received by the end device depend on the maximum hop count of the network.  
The investigation of data transmission parameters across the hydroacoustic channel revealed that the implementation of network communication protocols enables an enhancement in the probability of successful data packet exchange among the group's devices. However, this increased probability comes at the cost of reduced communication  
Figure 18: Metrics for the T-Lohi protocol for uWave modems.  
speed due to the management of delay values during data packet transmission within the distribution environment.  
Figure 19: Packet transmission ordering within the network (the orange arrows indicate packets sent by node M3, the green arrows indicate packets sent by node M2, and the blue arrows indicate packets sent by node M1).  
Figure 20: Indicators for data transfer between various LATENA devices on the network (blue—device 1, green—device 2, orange—device 3, and yellow—device 4).  
This is supported by the findings from experiments carried out under the conditions specified in Section 5 of this article, involving a group of hydroacoustic modems. The transmission results depicted in Figure 19, when not utilizing the developed protocols, indicate that the average transmission rate within the network is 30-40 bits per second. However, simultaneously, the probability of successful transmission falls within the range of only 60-70%.  
Figure 21 provides a summary of the baud rate information for each device, both with and without protocol.  
Using the data link and network layer protocols, the probability of successful delivery of a packet with data increases to 100% (Figure 20); however, the transfer rate can decrease to 50 bits/s.  
Figure 22 provides a summary of the success rate information for each device, both with and without protocol.  
Therefore, the difference in reliability and speed has been verified to be approximately twofold. In summary, the EviNS software framework, incorporating underwater network communication protocols, can be effectively integrated into the concept of the Marine Internet of Things or the group management of Autonomous Underwater Vehicles (AUVs). In scenarios where communication channel reliability is crucial, such as situations where corrupted data may impact navigation information or control signals for other devices, the EviNS framework plays a vital role in preventing incorrect commands and emergency incidents.  
Figure 21: The packet transmission rates using underwater communication protocols and without protocols.