About your “Disconnected” status in Sakia, this is pure network configuration issue. I am sure of this because your Raspi has found a proof as shown in http://remuniter.cgeek.fr.
Also, you should try the newest version 0.31.0 (no more a beta) on your Raspberry and see if you get the error again. Anyway, you should be able to reconfigure the network using either the UI (http://<your.raspi.ip:9220>) or directly the command line with:
duniter config --remote4 "your remote IPv4" --remotep "your remote port"duniter restart
I will update it to 0.31.0 in few minutes anyway 
If this helps me catch out your issue, that would be great.