GCMServerCredentials gcmCredentials = new GCMServerCredentials().senderAuthenticationKey(gcmKey)
.senderId(gcmSenderId).registrationId(GCM_REGISTRATION_ID);
builder.gcmServerCredentials(gcmCredentials);
}
PeerNAT peerNat = builder.start();
FutureRelayNAT futureRelayNAT = peerNat.startRelay(relays.get(0).peer().peerAddress()).awaitUninterruptibly();
if (!futureRelayNAT.isSuccess()) {
LOG.error("Cannot connect to Relay(s). Reason: {}", futureRelayNAT.failedReason());
return;
}