What is the best way for recieving data through serial port in hydro?

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Thank you very much! :)

excuse me , i write a simple program but it doesn't work! my program : #include "serial/serial.h" #include "ros/ros.h" int main(int argc,char **argv) { ros::init(argc,argv,"serial") ; ros::NodeHandle nh ; serial::Serial my_serial("dev/ttyUSB0",9600,serial::Timeout::simpleTimeout(1000),serial::eightbits,serial::parity_none,serial::stopbits_one,serial::flowcontrol_none); ROS_INFO_STREAM("Is Serial Port Open?"); if(my_serial.isOpen()) ROS_INFO_STREAM("Yes"); else ROS_INFO_STREAM("No"); } and I got these errors : CMakeFiles/serial.dir/serial.cpp.o: In function `main': /home/mohammad/ros_workspace/serial_test3/serial.cpp:8: undefined reference to `serial::Serial::Serial(std::string const&, unsigned int, serial::Timeout, serial::bytesize_t, serial::parity_t, serial::stopbits_t, serial::flowcontrol_t)' /home/mohammad/ros_workspace/serial_test3/serial.cpp:10: undefined reference to `serial::Serial::isOpen() const' /home/mohammad/ros_workspace/serial_tes

i think i should add a link to serial library but i don't know how!

You likely need to add the serial library to your package.xml and CMakeLists.txt file, so that you can find it in your package. Here is an example of a motor controller driver using the serial library: https://github.com/wjwwood/ax2550

I'm sorry for my delay(I got a bad cold!) I wrote another program but when i compiled it with catkin_make , it wrote this message in red color : "Linking CXX executable /home/mohammad/ros_workspace/devel/lib/first_test/serial " is it an error? and when i write "rosrun first_test serial" , it says : "[rosrun] Couldn't find executable named serial below /home/mohammad/ros_workspace/src/first_test "

and please see my CMakeList.txt file , is it correct? " cmake_minimum_required(VERSION 2.8.3) project(first_test) find_package(catkin REQUIRED roscpp serial) catkin_package( INCLUDE_DIRS LIBRARIES first_test CATKIN_DEPENDS serial ) include_directories(include ${catkin_INCLUDE_DIRS}) add_executable(serial serial.cpp) target_link_libraries(serial ${catkin_LIBRARIES} ${serial_LIBRARIES}) "

now it doesn't show that message but when i want to run it , this message shows : [rosrun] Couldn't find executable named serial below /home/mohammad/ros_workspace/src/first_test "

Finally I did it! Thank you very much , it was very helpful! :)