Hari Prasad can you please elaborate the case you want to study?

Why you want to use ETT and under what conditions?

I want to simulate RPL with ETT as a metric. That's my first point. I want to compare all metrics

to calculate ETT you have to use RTT.

And RPL is usually used with the combination of UDP at transport layer which means no acknowledgement and no calculation of RTT. Hence no ETT.

To add ETT you must have to use TCP with RPL

OR

you can write your own distributed code running at application layer of server side and client side with sending and receiving time. then calculate ETT and use it in RPL

Hi hari prasad,

The Routing networks has been a challenge.These groups lead directly to the design of the routing protocol for Low-Power and Lossy Networks” (RPL). when the network becomes denser or the number of nodes increases, both OF0 and MRHOF introduce long hops, which can generate a bottleneck that restricts the network. The adaptation is proposed to optimize both OFs through a new routing metric. some implementation problems of RPL in the Contiki system were found. These implementation problems reduced the performance unnecessarily, which forced experimental focus is solving the problems. SIGMA-ETX was designed is to allow RPL to test the link quality through bidirectional traffic and improvement in performance.

Best Wishes..

@sammiarauf do you have any code plz? For ETT ?

Dear Hari,

Read the following paper, I think you will find good information. One of the RPL metrics that has been used in this paper is the delay.

Conference Paper PEDAL: Power-Delay Product Objective Function for Internet o...