Hello Kai,
do you see a different behaviour of the blue LED if you connect to the international server and your own server? It should blink every second.
Try the following:
stop the automatic start of the server by editing the file “/etc/rc.local” again. Delete the inserted line or comment out by putting a hash (#) in front of the line.
Restart the PI and enter
cd /opt/Wio_Link
python server.py
Ther server should start now and you should see the communication, for example
[I 160430 10:13:30 server:535] SQLite version: 3.8.7.1
[I 160430 10:13:32 server:432] xchange device server accepted conns: 1
[I 160430 10:13:32 server:136] accepted sn: {your serial number here} @fw_version 1.1
[I 160430 10:13:32 server:165] valid hello packet from node 104
[I 160430 10:13:32 server:429] ota device server accepted conns: 1
[I 160430 10:13:32 server:136] accepted sn: {your serial number here} @fw_version 1.1
[I 160430 10:13:32 server:165] valid hello packet from node 104
[I 160430 10:14:32 server:306] heartbeat sent to node 104 on xchange channel
[I 160430 10:14:32 server:306] heartbeat sent to node 104 on ota channel
[I 160430 10:14:32 server:224] Node 104 alive on xchange channel!
[I 160430 10:14:32 server:228] Node 104 recv json on ota channel
Or do you see any error messages?