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2018-08-24 09:23:10 -0500 commented question Callback Function Not Running

ok I'm pretty sure this is all accurate now. I don't want to copy past all of the code since it's a couple hundred lines
2018-08-24 09:21:45 -0500 edited question Callback Function Not Running

Callback Function Not Running Hi guys, I'm using ROS kinetic on a Navio2 board, and am trying to use the velocity readi
2018-08-24 09:07:30 -0500 edited question Callback Function Not Running

Callback Function Not Running Hi guys, I'm using ROS kinetic on a Navio2 board, and am trying to use the velocity readi
2018-08-24 09:01:26 -0500 commented question Callback Function Not Running

I forgot to paste the while statement-i've edited the code

2018-08-24 09:00:55 -0500 edited question Callback Function Not Running

Callback Function Not Running Hi guys, I'm using ROS kinetic on a Navio2 board, and am trying to use the velocity readi
2018-08-23 15:01:09 -0500 asked a question Callback Function Not Running

Callback Function Not Running Hi guys, I'm using ROS kinetic on a Navio2 board, and am trying to use the velocity readi
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2018-08-21 10:40:45 -0500 asked a question Using Approximate Time Sync with headerless messages

Using Approximate Time Sync with headerless messages Hi guys, I've been trying to use approximate time synchronization

2018-08-21 10:21:21 -0500 marked best answer Boost compilation error

Hi guys,

I've been having issues with compilation errors where I've been getting this wall of errors:

/usr/include/boost/bind/bind.hpp: In instantiation of ‘void boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<void>, F&, A&, int) [with F = void (*)(const boost::shared_ptr<const sensor_msgs::Imu_<st
d::allocator<void> > >&, const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void> > >&); A = boost::_bi::rrlist9<const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void
> > >&, const boost::shared_ptr<const sensor_msgs::Imu_<std::allocator<void> > >&, const boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&, con
st boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const 
message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&>; A1 = boost::arg<1>; A2 = boost::arg<2>]’:                                                                          
/usr/include/boost/bind/bind.hpp:1402:50:   required from ‘boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()(A1&&, A2&&, A3&&, A4&&, A5&&, A6&&, A7&&, A8&&, A9&&) [with A1 =
 const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void> > >&; A2 = const boost::shared_ptr<const sensor_msgs::Imu_<std::allocator<void> > >&; A3 = const boost::shared_ptr<const message
_filters::NullType>&; A4 = const boost::shared_ptr<const message_filters::NullType>&; A5 = const boost::shared_ptr<const message_filters::NullType>&; A6 = const boost::shared_ptr<const message_filters::Nu
llType>&; A7 = const boost::shared_ptr<const message_filters::NullType>&; A8 = const boost::shared_ptr<const message_filters::NullType>&; A9 = const boost::shared_ptr<const message_filters::NullType>&; R 
= void; F = void (*)(const boost::shared_ptr<const sensor_msgs::Imu_<std::allocator<void> > >&, const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void> > >&); L = boost::_bi::list2<boos
t::arg<1>, boost::arg<2> >; boost::_bi::bind_t<R, F, L>::result_type = void]’                                                                                                                               
/usr/include/boost/bind/bind.hpp:833:35:   required from ‘void boost::_bi::list9<A1, A2, A3, A4, A5, A6, A7, A8, A9>::operator()(boost::_bi::type<void>, F&, A&, int) [with F = boost::_bi::bind_t<void, voi
d (*)(const boost::shared_ptr<const sensor_msgs::Imu_<std::allocator<void> > >&, const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void> > >&), boost::_bi::list2<boost::arg<1>, boost::a
rg<2> > >; A = boost::_bi::rrlist9<const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void> > >&, const boost::shared_ptr<const sensor_msgs::Imu_<std::allocator<void> > >&, const boost::
shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_fi
lters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&, const boost::shared_ptr<const message_filters::NullType>&>; A1 = bo
ost::arg<1>; A2 = boost::arg<2>; A3 = boost::arg<3>; A4 = boost::arg<4>; A5 = boost::arg<5>; A6 = boost::arg<6>; A7 = boost::arg<7>; A8 = boost::arg<8>; A9 = boost::arg<9>]’                               
/usr/include/boost/bind/bind.hpp:1402:50:   required from ‘boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()(A1&&, A2&&, A3&&, A4&&, A5&&, A6&&, A7&&, A8&&, A9&&) [with A1 =
 const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void> > >&; A2 = const boost::shared_ptr ...
(more)
2018-08-21 10:21:16 -0500 answered a question Boost compilation error

Fixed: the actual callback function had the parameters backwards

2018-08-21 09:25:39 -0500 commented question Boost compilation error

No, but the same errors came up after I did.

2018-08-21 09:19:13 -0500 received badge ● Popular Question (source)
2018-08-20 16:16:02 -0500 marked best answer Synchronizer.h Errors

Hi guys,

I've been trying to do approximate time synchronization, and have been adapting tutorial examples for my own needs. I was facing some errors with sync_policies not having a type, synchronizer not being declared in the scope, and so on. Seeing some other forum posts, I added

using namespace message_filters

and got a wall of errors:

/home/pi/ros_ws/src/link/src/roscomm.cpp: In function ‘int main(int, char**)’:   
/home/pi/ros_ws/src/link/src/roscomm.cpp:222:85: error: ‘IMU’ is not a member of ‘sensor_msgs’                     
   typedef sync_policies::ApproximateTime<sensor_msgs::NavSatFix, std_msgs::Float64, sensor_msgs::IMU> NavSyncPolicy;
                                                                                     ^~~~~~~~~~~
/home/pi/ros_ws/src/link/src/roscomm.cpp:222:85: error: ‘IMU’ is not a member of ‘sensor_msgs’                   
/home/pi/ros_ws/src/link/src/roscomm.cpp:222:101: error: template argument 3 is invalid
   typedef sync_policies::ApproximateTime<sensor_msgs::NavSatFix, std_msgs::Float64, sensor_msgs::IMU> NavSyncPolicy;
                                                                                                     ^                                                                                 
In file included from /home/pi/ros_ws/src/link/src/roscomm.cpp:21:0:                                                                                                                                        
/opt/ros/kinetic/include/message_filters/synchronizer.h: In instantiation of ‘class message_filters::Synchronizer<int>’:
/home/pi/ros_ws/src/link/src/roscomm.cpp:223:49:   required from here
/opt/ros/kinetic/include/message_filters/synchronizer.h:68:7: error: base type ‘int’ fails to be a struct or class type
 class Synchronizer : public boost::noncopyable, public Policy
       ^~~~~~~~~~~~
/opt/ros/kinetic/include/message_filters/synchronizer.h:71:37: error: ‘int’ is not a class, struct, or union type
   typedef typename Policy::Messages Messages;
                                     ^~~~~~~~
/opt/ros/kinetic/include/message_filters/synchronizer.h:72:35: error: ‘int’ is not a class, struct, or union type
   typedef typename Policy::Events Events;
                                   ^~~~~~
/opt/ros/kinetic/include/message_filters/synchronizer.h:73:35: error: ‘int’ is not a class, struct, or union type
   typedef typename Policy::Signal Signal;
                                   ^~~~~~
/opt/ros/kinetic/include/message_filters/synchronizer.h:74:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 0>::type M0;
                                                 ^~
/opt/ros/kinetic/include/message_filters/synchronizer.h:75:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 1>::type M1;
                                                 ^~
/opt/ros/kinetic/include/message_filters/synchronizer.h:76:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 2>::type M2;
                                                 ^~
/opt/ros/kinetic/include/message_filters/synchronizer.h:77:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 3>::type M3;
                                                 ^~
/opt/ros/kinetic/include/message_filters/synchronizer.h:78:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 4>::type M4;
                                                 ^~
/opt/ros/kinetic/include/message_filters/synchronizer.h:79:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 5>::type M5;
                                                 ^~
/opt/ros/kinetic/include/message_filters/synchronizer.h:80:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 6>::type M6;
                                                 ^~
/opt/ros/kinetic/include/message_filters/synchronizer.h:81:49: error: ‘int’ is not a class, struct, or union type
   typedef typename mpl::at_c<Messages, 7>::type ...
(more)
2018-08-20 13:53:42 -0500 received badge ● Popular Question (source)
2018-08-20 13:46:11 -0500 commented answer Synchronizer.h Errors

If time sync can't be used with message types without headers, is there any way to sync those types of messages then?

2018-08-20 13:45:22 -0500 asked a question Boost compilation error

Boost compilation error Hi guys, I've been having issues with compilation errors where I've been getting this wall of e
2018-08-20 13:35:51 -0500 received badge ● Supporter (source)
2018-08-20 13:35:48 -0500 edited question Synchronizer.h Errors

Synchronizer.h Errors Hi guys, I've been trying to do approximate time synchronization, and have been adapting tutorial
2018-08-20 13:32:25 -0500 edited question Synchronizer.h Errors

Synchronizer.h Errors Hi guys, I've been trying to do approximate time synchronization, and have been adapting tutorial
2018-08-20 13:32:25 -0500 received badge ● Editor (source)
2018-08-20 13:31:11 -0500 commented answer Synchronizer.h Errors

So the original issue was fixed, but now there's something wrong with my boost statement that I don't know how to fix (s
2018-08-20 10:13:02 -0500 asked a question Synchronizer.h Errors

Synchronizer.h Errors Hi guys, I've been trying to do approximate time synchronization, and have been adapting tutorial
2018-08-16 09:14:21 -0500 marked best answer Compilation Wall of Errors Seemingly Unrelated to .cpp

Hi guys,

I've been writing a ROS publisher/subscriber node in C++ on ROS kinetic using a Navio2 board. When I attempt to compile, I don't get any syntax errors, but instead get a wall of errors involving dependencies, serializations, and whatnot:

CMakeFiles/roscomm.dir/src/roscomm.cpp.o: In function `imuCallback(boost::shared_ptr<sensor_msgs::Imu_<std::allocator<void> > const> const&)':                                                              
roscomm.cpp:(.text+0x868): undefined reference to `ros::NodeHandle::NodeHandle(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::map<std::__cxx11::basic_string<$
har, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, st$
::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::alloca$
or<char> > > > > const&)'                                                                                                                                                                                   
roscomm.cpp:(.text+0x8e4): undefined reference to `ros::Rate::Rate(double)'                                                                                                                                 
roscomm.cpp:(.text+0x978): undefined reference to `ros::console::initialize()'                                                                                                                              
roscomm.cpp:(.text+0x9c4): undefined reference to `ros::console::initializeLogLocation(ros::console::LogLocation*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, $
os::console::levels::Level)'                                                                                                                                                                                
roscomm.cpp:(.text+0xa08): undefined reference to `ros::console::setLogLocationLevel(ros::console::LogLocation*, ros::console::levels::Level)'                                                              
roscomm.cpp:(.text+0xa10): undefined reference to `ros::console::checkLogLocationEnabled(ros::console::LogLocation*)'                                                                                       
roscomm.cpp:(.text+0xa78): undefined reference to `ros::console::print(ros::console::FilterBase*, void*, ros::console::levels::Level, char const*, int, char const*, char const*, ...)'                     
roscomm.cpp:(.text+0xa90): undefined reference to `ros::spinOnce()'                                                                                                                                         
roscomm.cpp:(.text+0xac0): undefined reference to `ros::Publisher::~Publisher()'                                                                                                                            
roscomm.cpp:(.text+0xacc): undefined reference to `ros::NodeHandle::~NodeHandle()'                                                                                                                          
roscomm.cpp:(.text+0xc08): undefined reference to `ros::Publisher::~Publisher()'                                                                                                                            
roscomm.cpp:(.text+0xc14): undefined reference to `ros::NodeHandle::~NodeHandle()'                                                                                                                          
roscomm.cpp:(.text+0xcf0): undefined reference to `ros::console::g_initialized'                                                                                                                             
CMakeFiles/roscomm.dir/src/roscomm.cpp.o: In function `main':                                                                                                                                               
roscomm.cpp:(.text+0xd54): undefined reference to `ros::init(int&, char**, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned int)'                           
roscomm.cpp:(.text+0xd98): undefined reference to `ros::NodeHandle::NodeHandle(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::map<std::__cxx11::basic_string<$
har, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, st$
::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::alloca$
or<char> > > > > const&)'                                                                                                                                                                                   
roscomm.cpp:(.text+0xe3c): undefined reference to `ros::spin()'                                                                                                                                             
roscomm.cpp:(.text+0xe4c): undefined reference to `ros::Subscriber::~Subscriber()'                                                                                                                          
roscomm.cpp:(.text+0xe58): undefined reference to `ros::NodeHandle::~NodeHandle()'                                                                                                                          
roscomm.cpp:(.text+0xed4): undefined reference to `ros::Subscriber::~Subscriber()'                                                                                                                          
roscomm.cpp:(.text+0xee0): undefined reference to `ros::NodeHandle::~NodeHandle()'                                                                                                                          
CMakeFiles/roscomm.dir/src/roscomm.cpp.o: In function `__static_initialization_and_destruction_0(int, int)':                                                                                                
roscomm.cpp:(.text+0xf48): undefined reference to `boost::system::generic_category()'                                                                                                                       
roscomm.cpp:(.text+0xf58): undefined ...
(more)
2018-08-16 08:36:33 -0500 commented question Compilation Wall of Errors Seemingly Unrelated to .cpp

In my CMakeLists.txt file, I added target_link_libraries(roscomm ${catkin_LIBRARIES}) and everything's working now

2018-08-16 08:09:28 -0500 commented question Compilation Wall of Errors Seemingly Unrelated to .cpp

I can't really tell if I'm accidentally C++11, but I haven't used basic_string anywhere in my code. One thing that I did
2018-08-16 08:08:21 -0500 commented question Compilation Wall of Errors Seemingly Unrelated to .cpp

I can't really tell if I'm accidentally C++11, but I haven't used basic_string anywhere in my code.

2018-08-15 14:50:24 -0500 asked a question Compilation Wall of Errors Seemingly Unrelated to .cpp

Compilation Wall of Errors Seemingly Unrelated to .cpp Hi guys, I've been writing a ROS publisher/subscriber node in C+
2018-08-14 18:11:40 -0500 received badge ● Popular Question (source)
2018-08-14 10:45:19 -0500 commented answer CMake cannot find source file

That seems to have done the trick, thanks!

2018-08-14 10:45:02 -0500 marked best answer CMake cannot find source file

Hi guys,

I'm using ROS kinetic on a Navio2 board, and I've been working on a project in a catkin workspace. I edited the CMakeLists.txt file to add an executable, but every time I attempt to run catkin_make, I get the following error:

CMake Error at link/CMakeLists.txt:201 (add_executable):
   Cannot find sourcefile:

    link/src/roscomm.cpp

  Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp .hxx .in .txx

CMake Error: CMake can not determine linker language for target: roscomm
CMake Error: Cannot determine link language for target "roscomm".
-- Generating done
-- Build files have been written to: /home/pi/ros_ws/build
Invoking "cmake" failed

I know for sure that this file exists, and I've tried using just roscomm.cpp instead of link/src/roscomm.cpp.

Edit:

The full path is ~/ros_ws/src/link/src/roscomm.cpp

The CMakeLists.txt is as follows:

cmake_minimum_required(VERSION )
project(link) 

find_package(catkin REQUIRED COMPONENTS  
  roscpp
  rospy
  sensor_msgs
  std_msgs  
)

catkin_package() 

include_directories(
  ${catkin_INCLUDE_DIRS}
)

add_executable(roscomm link/src/roscomm.cpp)
target_link_libraries(roscomm ${catkin_INCLUDE_DIRS})

Any help would be great, thanks
2018-08-14 10:45:02 -0500 received badge ● Scholar (source)
2018-08-14 10:43:29 -0500 commented question CMake cannot find source file

The full path is ~/ros_ws/src/link/src/roscomm.cpp I've edited the original text so that it can all fit in one place

2018-08-14 10:42:44 -0500 commented question CMake cannot find source file

The full path is ~/ros_ws/src/link/src/roscomm.cpp The CMakeLists.txt is as follows:cmake_minimum_required(VERSION ) pr
2018-08-14 10:42:08 -0500 edited question CMake cannot find source file

CMake cannot find source file Hi guys, I'm using ROS kinetic on a Navio2 board, and I've been working on a project in a
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