There is a browan image on it and yes it is an IOTMiner. 
And I did not change something with the json. Just to try with the GPIO mapping from this wiki: LoRaWAN® Gateway Module WM1302 | Seeed Studio Wiki .
So I think the GPS I2C path has also be correct, because I did not change it. How does the device recognize which concentrator card is in it? There are folders for sx1308 and sx1302.
And what is the right GPIO mapping in the json for my case?