When I tried to run rosmsg-gen.sh on a Mac, I got the following output:

$ ./rosmsg-gen.sh lcm/*.lcm
Processing LCM message file: lcm/example_type.lcm
    Generating CPP message exlcm/example_type.hpp with lcm-gen...done.
    Creating ROS message msg/example_type.msg...sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
 done.
    Creating new header exlcm_rehash/example_type.hpp with overridden hash: 0x0123456789abcdef  done.
Processing LCM message file: lcm/simple_channel.lcm
    Generating CPP message exlcm/simple_channel.hpp with lcm-gen...done.
    Creating ROS message msg/simple_channel.msg...sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
sed: 1: "tmp": undefined label 'mp'
 done.
    No valid hash value found in lcm/simple_channel.lcm, no rehash methods generated.

The problem is sed -i on OS X requires a backup file extension after the -i

Thanks for the hard work, this project works just fine.

I was wondering if you plan to add support for unsigned values, I have an example here for republishing messages from ROS to LCM with the VelodynePacket message.
The message is defined as follow:

rosmsg show velodyne_msgs/VelodynePacket 
time stamp
uint8[1206] data

Only when I try to recreate this with your package I can get only as far as:

rosmsg show lcm_to_ros/velodyne_packet 
time stamp
int8[1206] data

With result in the expected error
[ERROR] [1467982809.956284460]: Client [/lcm_to_ros/velodyne_packets_republisher] wants topic /lcm_to_ros/velodyne_packets to have datatype/md5sum [lcm_to_ros/velodyne_packet/08fc2f480f398e309323b41f1efa2fb9], but our version has [velodyne_msgs/VelodyneScan/50804fc9533a0e579e6322c04ae70566]. Dropping connection.

I could have an intermediate node to cast the data type for each point from unsigned to signed, but it doesn't seem right for the heavy amount of data I get in. Would you have any suggestion on how to solve this?

Hi!

I followed the README using my custom message type mbot_encoder_t

package mbot_lcm_msgs;

struct mbot_encoder_t
{
    int64_t utime;
    int64_t leftticks;
    int64_t rightticks;
    int16_t left_delta;
    int16_t right_delta;
}

rosmsg-gen.sh, rosrepub-gen.sh and catkin build complete without error, but when I run roslaunch lcm_to_ros mbot_republishers.launch this error message is printing error -1 decoding mbot_encoder_t!!! Before any messages are even published to LCM? What is it attempting to decode?

FWIW my config looks like so:

# LCM to ROS republisher with normal hash
MBOT_ENCODERS, mbot_lcm_msgs, mbot_encoder_t, lcm2ros

Any help is much appreciated!

Hi,

I'm trying to republish an lcm image topic to a rostopic using your lcm_to_ros repo.

But when I use the pipeline, after generating the header files and running the roslaunch file, I get the following error message:

error -1 decoding image_t!!!

Here is the lcm message definition file:

package image_types;

struct image_t
{
    int32_t num_channels;
    int32_t width;
    int32_t height;
    double  image[num_channels][width][height];
}

Here is the file I'm using to publish the lcm image topic:

# %%
import numpy as np
import lcm
from image_types import image_t

# %%
lc = lcm.LCM()

# %%
msg = image_t()
msg.width = 10
msg.height = 3
msg.num_channels = 3
msg.image = np.random.rand(3, 10, 3).tolist()

# %%
lc = lcm.LCM()
lc.publish("image_topic", msg.encode())

Here is the config file I defined:

# --- Config file for generating ROS/LCM republishers ---
# This file is intended to be used with the rosrepub-gen 
# script, which will (for each non-comment line of this 
# file) attempt to generate C++ republisher code that
# republishes messages of a specified to to/from a ROS
# topic from/to an LCM topic.
#   Each (non-comment) line of the file should contain four
#   comma-separated fields:
#   topic_name, msg_package, msg_type, direction

# LCM to ROS republisher with normal hash
#example_topic, exlcm, example_type, lcm2ros

# ROS to LCM republisher with overridden hash value
#other_topic, exlcm_rehash, example_type, ros2lcm

# LCM to ros image republisher
image_topic, image_types, image_t, lcm2ros

Should I be doing something with the rehashing? Is there something obvious that I messed up? I would appreciate some guidance.

Here is a link to a zip file of the catkin_ws I am using:
https://drive.google.com/file/d/121cILabY0NERJZgVgLz5OANH4mor7CFj/view?usp=sharing

Hi,

I try to run your package and apparently need some modifications. When I try to compile after both ./rosmsg-gen.sh -a and ./rosrepub-gen.sh repub_configs/example_republishers.cfg, The catkin_make gives me several errors related with the includes (doesn't find any because of the path).

I don't know the best way to fix it but my first approach is:

1.- If the includes are not well linked, you must change the following files:

src/lcm2ros_default_republisher.cpp.in --> Search the line with:
#include "@PACKAGE_NAME@/@[email protected]"
and replace with:
#include "../@PACKAGE_NAME@/@[email protected]"

src/lcm_rehash.hpp.in --> Search the line with:
#include "@OLD_PACKAGE_NAME@/@[email protected]"
and replace with:
#include "../@OLD_PACKAGE_NAME@/@[email protected]"

src/ros2lcm_default_republisher.cpp.in --> Search the line with:
#include "@PACKAGE_NAME@/@[email protected]"
and replace with:
#include "../@PACKAGE_NAME@/@[email protected]"

And other problem is at the time to generate the ros msgs.

In the republisher doesn't find the autogenerated ros messages:
This error is basically that the catkin_make doesn't generate the messages. In order to allow the catkin_make create the ros messages,
edit the lcm_to_ros/CMakeLists.txt search:

################################################

Declare ROS messages, services and actions

################################################

#FILE(GLOB rosMsgFiles RELATIVE "${CMAKE_SOURCE_DIR}/${PROJECT_NAME}/msg"

"${CMAKE_SOURCE_DIR}/${PROJECT_NAME}/msg/*.msg")

#FOREACH(rosMsg ${rosMsgFiles})

MESSAGE( STATUS "Processing message file: ${rosMsg}" )

add_message_files( FILES ${rosMsg})

#ENDFOREACH(rosMsg)

#generate_messages(

DEPENDENCIES

std_msgs

#)

Comment all the lines and add the following:

add_message_files(
FILES
example_type.msg
simple_channel.msg
)

generate_messages(DEPENDENCIES std_msgs)

All other scripts are good and The work is very nice. I hope we can do some trick in order to create sensor messages like laser and images.