## 4 Results  
The field trial tests started in Genoa (Italy) on the 13 th of April and ended on the 20 th of April when the Jolly Titanio docked at Alexandria (Egypt) seaport. The data produced by the CTDs are related to two main scenarios, the terrestrial scenario and the maritime scenario. Each one, in turn, is divided into the following operational periods:  
* Terrestrial scenario \(\Box\)  
Containers in the yard  
Figure 19: Pair of CTDs \"1 Sx\" (Red) and \"1 Dx\" (Red) on the container in the yard. \begin{tabular}{l l} \(\odot\) & Container loading operations on the ship \\ \(\odot\) & Containers on the ship at the dock \\ \(\bullet\) & Maritime scenario \\ \(\odot\) & Navigation in \"near sea\" \\ \(\odot\) & Navigation in \"open sea\" \\ \end{tabular}   
The Jolly Titanio cargo ship left the port of Genoa on 16 April at 4:00 pm, starting the field trial maritime scenario. During the navigation, the Smart Cell emission on B28 was enabled or disabled in compliance with regulations and authorization in force:  
\(\bullet\) & The cellular base station was turned on beyond 12 miles from the Italian coast; \\ \(\bullet\) & The cellular base station was turned off within 41 miles of the foreign coast; \\ \end{tabular}  
In order to trigger the Smart mIoT Gateway lock/unlock commands towards the base station according to the constraints, a set of geographical polygons were identified over the seas crossed by the Jolly Titanio route (i.e., Mediterranean Sea and Red Sea) up to the satellite Eutelsat 33E coverage limit. Figure 20 shows the geographical polygons identified across the Mediterranean Sea crossed by the Jolly Titanio route. The boundary lines of the white polygons identify a distance of 12 miles from the Italian coast and a distance of 41 miles from the foreign coast. According to the color of the line representing the route followed by the Jolly Titanio, during the field trial, three situations occurred:  
1. Blue line \(\rightarrow\) Near-Sea Scenario: the position of the Jolly Titanio was within 12 miles of the Italian coast, and the CTD messages are supported by the TIM terrestrial commercial network. 2. Orange line \(\rightarrow\) Open-Sea Scenario: the position of the Jolly Titanio was beyond 12 miles from the Italian coast and, at the same time, beyond 41 miles from the foreign coast. The CTD messages are supported by the hybrid cellular/satellite network communicating with the onboard Smart Cell. 3. Green line: \(\rightarrow\) The position of the Jolly Titanio was beyond 12 miles from the Italian coast and, at the same time, within 41 miles from the foreign coast (Corsica), the onboard cellular network is off, and no CTD message is transmitted. For every scenario (terrestrial, near-sea navigation and open-sea navigation), the CTDs produced data showing the status of sensors, radio connections, alarm events, time and positions, battery charge, etc. Those data were directly published to the ICON OneM2M  
Figure 20: Jolly Titanio route: “near sea” data in blue, “open sea” data in orange, no data in green. platform, which was also devoted to the storage of all the information from the CTDs during the whole period of experimentation. The CTDs produced two kinds of messages, synchronous and asynchronous. According to the synchronous transmission operation, each CTD tried to send a message every 30 min via either the NB-IoT network or (if NB-IoT is unavailable) BLE Mesh. The synchronous message contains the updated status of all the monitored values of the containers. On the other hand, the asynchronous message is triggered by an event, which causes the guard thresholds of the temperature, acceleration, pressure, etc., sensors to be exceeded. It is, therefore, an occasional message that contains only event information and an indicator of either alarm onset (when thresholds are exceeded) or alarm cease (when sensors are within thresholds). As an example, a synchronous message sent from a CTD to ICON is shown in Figure 21.  
Figure 21: Synchronous message from a CTD to the ICON platform.