How to publish a array msgs with large data size in Arduino?

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Dear all, I amtrying to publish a msgs with large data size on Arduino. I have tried both Float32MultiArray and Laserscan msgs. However, when i increase the data_length more than 7, it shows an error in the terminal [INFO] [WallTime: 1391356801.758318] Failed Packet Flags after the command "rosrun rosserial_python serial_node.py /dev/ttyACM0" (the code as attached). If I keep the size below 7, the msgs can be published normally.

Could you help me and give me some suggestion, please? thank you!!

#include <ros.h>
#include <ros time.h="">
#include <std_msgs float32multiarray.h="">


ros::NodeHandle  nh;
std_msgs::Float32MultiArray range_msg;
ros::Publisher pub_range("/test", &amp;range_msg);

void setup()
{
  nh.initNode();

  range_msg.data_length=100;

  nh.advertise(pub_range);

}

long range_time;

void loop()
{
  //publish the adc value every 50 milliseconds
  //since it takes that long for the sensor to stabilize

  if ( millis() &gt;= range_time ) {

    for(int i=0;i&lt;100;i++)
    {
      range_msg.data[i]=0.01222331221;
    }

    pub_range.publish(&amp;range_msg);

    range_time =  millis() + 50;
  }

  nh.spinOnce();
}</std_msgs></ros></ros.h>