CTP Routing, was RE: [Tinyos-help] Antitheft compile warnings on new platform

[Todd Roper]

> 
> If it's trying to send to a node that doesn't exist, that's strange.
> It suggests memory corruption in the routing table. In theory, it
> should not stick with such a node very long, as the ack-based
> estimates will let it know that this is not a good node.

It seems that once it is stuck like this, it stays there until the node
is reset.  I am curious as to why it does not recover from this.

 
> Looking at your trace, though, I'm a bit worried: node 33's data
> packets say that it has a route ETX of 0! This seems very unlikely.
> It also takes many packets for 33 to switch over. Are you sure there
> is no node 80 in your network? 

Yes, there is no node 80 in my network.

> If it is issue link-layer ACKs, then
> 33 might stick with it for a while.
> 
> I don't think net2 has ever seen behavior like this. It doesn't mean
> that it's never happened, we've just never observed it.
> 
> Phil

I went ahead and reset the two suspect nodes yesterday and as expected,
they started sending data into the network again.  This morning, I
discovered that one of them was trying to send through a node 2 this
time.  (node 2 is not in the network).  It does retry 30 times every 5
minutes (that is my programmed interval for reporting).

I disconnected the Root node and then powered it back up after a few
minutes.  I have attached a small log file showing some extra bytes in
the beacon packet every once in a while.  I have also noticed that I get
bits shifting in the messages every once in a while (seems odd given
that there is a checksum).

I am wondering if there could be packet corruption causing routing
corruption????

One other note is that once the node was stuck on trying to send to Node
2, I noticed it no longer sends out its routing table info every once in
a while.

Wondering where to look next...

Best regards,

Todd

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