[Contiki-developers] RPL metric

[Emanuele Lomartire]

Hi,  

I'm trying to insert energy metric in RPL. I would like to know if there are

some guidelines in order to do it, in particular which files I should modify.

Best Regards.

Emanuele

[Nicolas Tsiftes]

You can modify rpl-of-etx.c in the function calculcate_path_metric. Energy metric containers can be used by defining RPL_DAG_MC to RPL_DAG_MC_ENERGY.

You also have to replace the parent link metric (p->link_metric) to use energy values instead of ETX. This variable is primarily set in rpl.c.

Nicolas

[Emanuele Lomartire]

Thanks for the answer.

I would know if I should also modify neighbor-info.c creating a new attribute for the neighbor, in this case the residual energy's attribute.

Best Regards.

Emanuele 

[Nicolas Tsiftes]

No, it is sufficient to calculate the additive path energy metric by
extracting the information from the energy metric container in RPL, and
adding the local energy cost. The outgoing energy metric container from
a node will thus contain an energy value that is the sum of incoming
energy value from the best parent and the local energy value.
Calculating the local energy value is probably easiest to do by using
energest information (sys/energest.h).

Nicolas

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[Rocky]

Hi,

My question is regarding the below possible combination.

contiki-conf.c

-------------------

#define RPL_CONF_DAG_MC 2 /******* Configured for NODE ENERGY *********/

rpl-conf.h

-------------

#define RPL_OF rpl_mrhof

Environment:

Contiki RPL configured for MRHOF with metric container as node energy.

File: https://github.com/contiki-os/contiki/blob/master/core/net/rpl/rpl-mrhof.c

[Problem]

In this case, when I wanted network to be set based on NODE energy, I can see the parent link metric is linked to ETX callback RATHER than energy residual.

And there by I am getting wrong value in the energy estimation each time my DIO is fired.

This is also causing recalculation of DAG rank each time when I sent a packet,

due to neighbor_link_callback() updating the parents link metric.

Also I cross verified with the RFC 6719, and the NODE Energy object doesn't seems to follow the protocol,

since the ENERGY EST is calculated on parents link metric.

In other words, Node metric value is getting mixed up with ETC link metric.

A Wireshark dump of metric container is as follows:

------------------------------------------------------------------------------

(DAG Metric information)

------------------------------------------------------------------------------

Type                  : 0x02

Length                : 6

Metric type           : 0x02 (Metric Energy)

Flags                 : 0x04

P-flag : 0x01

C-flag : 0x00

O-flag : 0x00

R-flag : 0x00

Aggregator type       : 0x00 (Metric is additive) 

Precedence type       : 0x00

Object body length    : 0x02

Metric energy

Energy flags      : 0x00

Energy estimation : 0x80

The point is that the below code is running even if the metric container is set to NODE ENERGY

static void neighbor_link_callback(rpl_parent_t *p, int status, int numtx)
{
  uint16_t recorded_etx = p->link_metric;
  uint16_t packet_etx = numtx * RPL_DAG_MC_ETX_DIVISOR;
  uint16_t new_etx;

  /* Do not penalize the ETX when collisions or transmission errors occur. */
  if(status == MAC_TX_OK || status == MAC_TX_NOACK) {
    if(status == MAC_TX_NOACK) {
      packet_etx = MAX_LINK_METRIC * RPL_DAG_MC_ETX_DIVISOR;
    }

    new_etx = ((uint32_t)recorded_etx * ETX_ALPHA +
               (uint32_t)packet_etx * (ETX_SCALE - ETX_ALPHA)) / ETX_SCALE;

    PRINTF("RPL: ETX changed from %u to %u (packet ETX = %u)\n",
        (unsigned)(recorded_etx / RPL_DAG_MC_ETX_DIVISOR),
        (unsigned)(new_etx  / RPL_DAG_MC_ETX_DIVISOR),
        (unsigned)(packet_etx / RPL_DAG_MC_ETX_DIVISOR));
    p->link_metric = new_etx;
  }
}

Kindly let me know your views on the same.

Thanks and regards,
Libin Jose.

[rehmat...@gmail.com]

Dear Libin Jose?

 I need your help in energy based routing in RPL . Could you please help me in this regards??

Regards

Rehmat

 

[anam....@gmail.com]

If I want to use rssi as metric, what changes I need to make.

Anam

[addepalli...@gmail.com]

Hello,

How can I add/enable the Dag metric's on DIO sending on contiki/6lbr

I have tried using flags resided on rpl-con.h and rpl-private.h file but I could not make it.please help me out on this issue.

With regards
A.Ganesh