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I sort of made it work for now. As I initially suspected the problem was in the way the serial number is handled internally. I manually changed the file "epos.cpp" and recompiled and the issue was solved. This is the change I did in case anyone is interested:

   if(!config_nh_.getParam("serial_number", serial_number_str)) {
     ROS_ERROR("You must specify a serial number");
     valid_ = false;
  }
  else {

    ROS_ASSERT(SerialNumberFromHex(serial_number_str, &serial_number_));
  }

I changed it to:

config_nh_.getParam("serial_number", serial_number_str);
ROS_ASSERT(SerialNumberFromHex(serial_number_str, &serial_number_));

I think that serial_number_str was not being collected properly but I am no expert. How can I make it known to the author?