Isaac Marino Bavaresco wrote: > If the nodes lose connection for too long the sequence numbers may get > very far apart You are making this way too complicated. This is a simple network where it's not even clear true peer to peer is needed. The simply shouldn't send the next command until it receives a ACK for the previous. There is no need for packets to ever get out of order. There is no router. Everything is on a single segment. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist