Any working Class C projects? EU868

As the title suggests I am looking for examples using end devices with class C downlink capabilities.
I am close to scrapping the project because I cant get it to work so any examples or suggestions would be greatly appreciated.
So if you have successfully configured a end device to work in class C mode and are able to send downlinks to it from chirpstack I would be happy to hear what end device and code you are using.

You can try Dragino LT-22222-L and RS485-LN.
Class C downlink works with ChirpStack.