As recommended in section 6.7 of the DNS-Based Service Discovery spec a version key should be added to the mDNS TXT record. This will reduce issues caused by incompatible versions of the same service.
Look in P2PService.java for a list of Labels used for the same purpose in the Wifi Direct DNS TXT record. It would make sense to use a common set of labels.
As recommended in section 6.7 of the DNS-Based Service Discovery spec a version key should be added to the mDNS TXT record. This will reduce issues caused by incompatible versions of the same service.