Get Blank Forms from ODK Collect not working on local ODK central server

[aurdipas]

Probably you can find an asnwer on one of the following posts:

Use easy-rsa to set up a self-signed certificate authority for Central

I have spent a whole day googling not to understand this: Generate appropriate fullchain.pem (-out) and privkey.pem (-keyout) files. Says the ODK Doc. Now I have ca.crt, ca.key, myform.key and myform.crt, and I know how to convert these to pem and concatenate private and public. But I am lost why I need fullchain.pem (contains private+public) and privkey.pem(private of what)?

Selfsign certificate with latest Central

I don't think there are any issues specific to Central with this. I recommend reading through some threads like https://security.stackexchange.com/questions/121163/how-do-i-run-proper-https-on-an-internal-network and https://serverfault.com/questions/964119/enable-https-on-a-private-network to get a feel for the challenges and possible approaches. I think it's also possible to get a specific Android device to accept a self-signed cert following instructions like these.