Rosserial_Arduino : Array of Boolean error message

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Dear all,

I'm having some trouble with the publishing of an array of boolean coming from an arduino using rosserial. The original idea was the following :

#include <ros.h>
#include <roskeepon/sensorstat.h>

ros::NodeHandle  nh;

roskeepon:: sensorstat buttonState;
ros::Publisher chatter1("buttons", &buttonState);

void setup(){
  nh.initNode();
  nh.advertise(chatter1);
  buttonState.sensorstat_length = 4; }

void loop(){
  for(int i=0 ; i <4;i++){
     buttonState.sensorstat[i] != buttonState.sensorstat[i]; }
  chatter1.publish( &buttonState);
  nh.spinOnce(); 
  delay(1000); 
}

with sensorstat.msg :

bool[] sensorstat

This should change the value of the boolean. But is doesn't, it just initialize a vector of 4 booleans which stay constant. changing the for loop into the following :

for(int i=0 ; i <4;i++){
  if (buttonState.sensorstat[i]){buttonState.sensorstat[i] = false; }
  else { buttonState.sensorstat[i] = true;}
}

but this gives following error when I try to make the serial connection :

[ERROR] [WallTime: 1397466438.097662] Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino

I tried several things : Like using an array of boolean to go through the loop. Which is later copied to buttonState.sensorstat. Same problem : every thing is good when the value is not changed during the loop, once the value starts changing the same error occurs.

I also tried to use the std_msgs / Int8MultiArray with 1 and 0, but the same problem occurs. everything is fine as long as the value doesn't change.

I searched for several days for a solution, also the web and the ROS forum, but I wasn't successful.

I use Hydro and run Ubuntu 12.04 on an Medion Akoya with kernel 3.2.0-60-generic.

I'm new to ROS and the community so I'm not sure of the question is appropriate...

Anyway : Thanks in advance!

Y2D2