I’ve configured the gateway for dual serial ports. The dual serial ports are set to use TCP/2101 for serial 1 and TCP/2102 for serial 2. The gateway answers on these TCP ports and, with a serial loopback plug at the end of the 'Y" cable serial ports, I see my looped data when testing.
Once I allow IP passthrough on the router in order to connect an Ethernet device, the second serial port does not answer on any TCP port. Is this a firmware bug or how it is supposed to work or a configuration error?
For clarity, serial 1 still answers on TCP/2101 when IP passthrough was enabled. Only serial 2 failed to answer on TCP/2102. This was also observed on firmware 4.13.0 so it didn’t just happen when upgrading to 4.15.0.