jks

An ip:port combination must uniquely identify a single network connection. So there is no conflict with having two port 8073 devices on your local network, the 10:8073 and 103:8073 devices. Each can be reached separately and simultaneously. The problem comes when trying to reach them from the Internet via your modem/router.

On the Internet-side of the router there are only addresses of the form public-ip:port So a particular public port can only map to a single device on the local side e.g. pub:8073 => 10:8073 Assuming you have access to the NAT configuration of your router, which you may not for a 4G modem/router, you could also have, say, pub:8074 => 103:8073 Or if you have configured the "103" Kiwi to use port 8074 successfully (you had an issue doing this?) then pub:8074 => 103:8074

In your particular case the issue is slightly different because you're using the Kiwi proxy due to not having configuration access to the router. The proxy is mapping name1.proxy.kiwisdr.com:8073 => 10:8073 The proxy always has to use port 8073 with proxy.kiwisdr.com With v1.290 it is now possible to simultaneously map name2.proxy.kiwisdr.com:8073 => 10:8074 (note "name2" and "8074"). On the public side the use of "name1" and "name2" will differentiate the two Kiwis.

But on the local side you must use two different port numbers because of how the proxy works. It is not able to configure any NAT in your router that might otherwise allow using the same port number on the two Kiwis on the local side.

Just about any 30x30mm brushless 3.3-5V fan will do. Try to get one with ball instead of sleeve bearings. Running a 5V fan on the 3.3V from the Kiwi Grove connector is fine and will reduce the fan noise (I believe the enclosure ships with a 5V fan).

When the time comes the biggest problem will be putting the Grove connector on the new fan leads. The pins should be removable from the white body of the Grove connector. Or you could cut-and-splice the wiring. I prototyped with some fans from Mouser I think.

v1.291  June 13, 2019
    Fix problems with the last release:
        Deleting masked frequency labels.
        Missing echoing of black dots in password fields.
        A single step of the mouse wheel didn't always zoom.
        Reduce unnecessary cases of "click to start" being displayed.

With a TVS it's not so much the voltage that kills them as the time profile of the current pulse. The Kiwi uses the CDSOD323-T03C and the data sheet is here: https://www.bourns.com/docs/Product-Datasheets/CDSOD323-TxxC.pdf

Okay, this was relatively easy and will be in the next release.