rosserial arduino can't connect (Arduino micro)

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Hi all,

I have a problem with rosserial_arduino. The demo hello world program compiles fine in the arduino IDE.

#include <ros.h>
#include <std_msgs/String.h>

ros::NodeHandle  nh;

std_msgs::String str_msg;
ros::Publisher chatter("chatter", &str_msg);

char hello[13] = "hello world!";

void setup()
{
  nh.initNode();
  nh.advertise(chatter);
}

void loop()
{
  str_msg.data = hello;
  chatter.publish( &str_msg );
  nh.spinOnce();
  delay(1000);
}

The problem that I have is that ros can't connect to the arduino.

When I run this "rosrun rosserial_python serial_node.py /dev/ttyACM0" I get the error:

[INFO] [WallTime: 1399983521.604184] ROS Serial Python Node
[INFO] [WallTime: 1399983521.617853] Connecting to /dev/ttyACM0 at 57600 baud
[ERROR] [WallTime: 1399983538.726124] Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino

When I run this "rosrun rosserial_server serial_node /dtyACM0" I get these messsages:

[ INFO] [1399983906.306684433]: Opening serial port.
[ INFO] [1399983906.306988104]: Starting session.
[ WARN] [1399983907.309690537]: Sync with device lost.

I also have added my user to the usergroups dialout and tty. That fixes the problem that I can access the port without admin(sudo) right.

I use this in combination with an Arduino Micro but it's the same as an Arduino Uno but then a bit smaller.

I hope you can help me with my problem.