Thanks a lot for your comments.
The reason for using Lora is simply because I want to check our custom board with SX1276 that the hardware assembly is compliant with LoRa. So I thought that it should be possible to use two such identical boards to check the communication between them. At the moment I do not have a gateway at hand which I thought is not necessary to test just compliance to LoRa.
That's quite disappointing that one cannot use LMIC for such purpose as I will need to rewind all the work of adapting LMIC to our board.
Still hope that a more positive verdict could be given to LMIC for node-to-node communication.
Thanks again for any clarification.