Hi Sebastian,
Thanks for coming to the rescue yet again. I already owe you some for the couple previous rescues;)
I have two systems (One is RPi and the other is a TP-Link router).
Both have the following IPs: 192.168.10.53 and 192.168.10.207 and both are able to ping each other on the network level. Therefore, I assume the problem to be on the IBR-DTN level since ad-hoc communication is set properly.
When I use two RPi's or an RPi and an x64-based laptop running Ubuntu, DTN-pings like a charm. There seems to be a problem communicating between the two (Rpi and TP-Link). The DTN is running on an external pen drive on TP-Link (since, there is no space for it on the flash memory)
Apparently not just one but these two errors, aka warnings (over TP-Link):
ERROR TCPConvergenceLayer: bind failed (cannot bind socket with address [192.168.10.207]:4556)
ERROR IPNDAgent: join failed on wlan0; 99: setsockopt()
PS: Attached is the ibrdtn.conf file as seen on the TP-Link router and RPi. In my personal experience, the Rpi Ibrdtn file is unchanged for a long time and the settings work with other neighboring nodes without a problem. The problem can be/should be with TP-Link part, I believe.
If I solve this, I am sure to throw a party ;) Any help is greatly appreciated.