Gmapping for Building a Map

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Hello,

I am trying to use gmapping package for building a map.

My tf tree is complete: map --> odom --> robot/base_footprint --> robot /base_link --> robot/laser

map --> odom is broadcast by /slam_gmapping and odom --> robot/base_footprint is broadcast by /ekf_localization

At the beginning I was getting the following warning message:

MessageFilter [target=/odom ]: Dropped 100.00% of messages so far. Please turn the [ros.gmapping.message_notifier] rosconsole logger to DEBUG for more information

I set the DEBUG mode in rqt, and I got the following message:

 MessageFilter [target=odom ]: Added message in frame laser at time 1414977417.595, count now 5

using this therad. I set rosparam set use_sim_time true, and the warning message disappeared, but the DEBUG mode is still showing the message above.

Nothing is published to /map topic.

Laser is published to robot/scan

I am not sure if I have to set the frame id for my laser which is robot/laser or not. gmapping does not seem to have such a parameter, but I have set

 <param name="base_frame" value="robot/base_footprint"/>
 <param name="odom_frame" value="odom"/>

I have also set in my launch file:

<arg name="scan_topic" default="robot/scan" />
<remap from="scan" to="$(arg scan_topic)"/>

Any thoughts?