We do have the SPN version running. For us it is also for testing stuff that comes with a predefined Networks key and for sending back commands to the nodes. It does have an integrated server component for local storage of all received communication.
I have some issues though with some sensors, apparently the SPN software does not handle Void frames correctly. I am awaiting an answer of Kerlink on this.
Switching the gateway between SPN and TTN use is easy. If you have the correct files on an USB stick, it is just putting the stick in and waiting until the configuration has changed to the requested setup.
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SPN version of the Kerlink IoT gateway
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