WiFi and 4G are active when the device starts up.
WiFi and 4G are active when the device starts up.
Just so I have you straight. You have a boat. You are trying to get internet service on your boat. Some ports that you dock at have WiFi available for use. However when WiFi is not present you are going to be using 4G LTE for internet service. Is that correct? If that is correct they do have routers that support fail over. Meaning when one connection goes down another takes its place. It might not be 100% seamless, as in you might drop a few packets, but its pretty automatic.
Only a handful of consumer routers offer this capability. Remember that WiFi typically works as a LAN connection, not a WAN one. You'll need to find a way to capture the Wi-Fi signal and transmit it through the WAN port. The next step involves deciding how to link the cellular modem to the router—some models support Ethernet connections while others use USB.