public NetModificationAlert(ArrayList unreachablePeers){
this.unreachablePeers = unreachablePeers;
String id;
try{
id = (new DigestManager()).getDigest(System.
currentTimeMillis() + "");
}catch(Exception e){id = Math.floor(Math.random()*Math.pow(10,32))+"";}
this.fillMessageProperties("","","",0,id);
}