I need to tell the ROOT/BaseStation node in the network about a particular node being turned off. As the neighboring nodes have information about a particular node and they receive constant beacons from each other, I am wondering that if I can work out that a beacon has not been received then one of the neighboring nodes should be able to send a message to the Root node telling that a node in its routing table is not there anymore. But then due to changes in ETX values Nodes might be changing their Routing tables, so a change in the Routing table entry in one of the neighboring nodes is not a sure shot way to find out the status of nodes. If my reasoning is correct, then how can we achieve this???
Cheers, Varun Jain From: [email protected] [mailto:[email protected]] On Behalf Of Mohammed Billoo Sent: Wednesday, 23 September 2009 6:21 AM To: [email protected] Subject: [Tinyos-help] Using CTP to detect Node Status?? Hi, Do you want to tell the same node that it has been turned off or do you want to tell another node in the network that a particular node has been turned off ? I read the TEP on CTP and didn't see any form of Acks being used so that you could determine whether a node is turned on or off based on these Acks. Maybe you could integrate an Ack method with CTP to figure out if a node is on or off. Regards, -- Mohammed Billoo Hi, If I want to know that a node has been turned off in the network, is there a way that the neighbor nodes can inform it?? I know there is an application called "Antitheft" which uses sensors to do that but I do not want to use sensors, I want to use the routing information available with the neighboring nodes to inform this. I was thinking if it can be done from within the CtpRoutingEngine???? To understand better about the CTP protocol, could someone explain what can be possible effects of the "etx" bug fixed recently (Sep 21,2009) in CtpRoutingEngine and CtpRoutingPacket if we do not commit the fix in our code. I just want to understand the misbehavior that the bug can cause (if not fixed) in the network?? Thanks, Varun Jain
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