try {
c.send(MSG_GetClientIdReq);
byte[] data = c.receive(MSG_GetClientIdResp);
if (data == null)
return null;
RpbGetClientIdResp res = RPB.RpbGetClientIdResp.parseFrom(data);
clientID = res.getClientId();
return clientID.toStringUtf8();
} finally {
release(c);
}
}