Arduino code facing problems with rosserial

edit

Hello, I am a beginner. I will try to be as specific as possible, So I am trying to run a single servo with arduino using rosserial lib. I am using the example code for servo control :

#if (ARDUINO >= 100)
 #include <Arduino.h>
#else
 #include <WProgram.h>
#endif

#include <Servo.h> 
#include <ros.h>
#include <std_msgs/UInt16.h>

ros::NodeHandle  nh;

Servo servo;

void servo_cb( const std_msgs::UInt16& cmd_msg){
  servo.write(cmd_msg.data); //set servo angle, should be from 0-180  
  digitalWrite(13, HIGH-digitalRead(13));  //toggle led  
}


ros::Subscriber<std_msgs::UInt16> sub("servo", servo_cb);

void setup(){
  pinMode(13, OUTPUT);

  nh.initNode();
  nh.subscribe(sub);

  servo.attach(9); //attach it to pin 9
}

void loop()
{

  nh.spinOnce();

  delay(1);
}

there is always an error on every upload I do --- > avrdude: stk500_recv(): programmer is not responding I have to always change the permission for /dev/ttyACM0 with "sudo chmod a+rw /dev/ttyACM0", after this I uploaded the code and it was successful.

I uploaded the code, uploading was successful but when I connected the servo, it did not give any output(it did not run) when I published an angle msg on servo topic, when I echoed the servo topic, the msgs topic was talking all the msgs but there was not movement in the servo at all.

Then I tried to run a non-ros code to run a simple servo on my computer and with the simple code too the servo did not respond at all, just to make sure that all the hardware was fine and I took another windows-computer and tried to upload the simple code and the servo worked great with the same code.

I am using ros-kineitc and rosserial for this project, what could be the problem here ? please help me and ask any further questions as required to solve this. Thanks for any help.