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ax12_driver_core::MotorStateList contains an array of ax12_driver_core::MotorState messages. In C++, ROS arrays are converted to C++ std::vector.

To print the motor position of the first MotorState in the array you might use something like:

ROS_INFO("I heard : %d", msg->motor_states[0].position;);

You might want to also check that motor_states vector has at least 1 element :

if (msg->motor_states.size() > 0)

ax12_driver_core::MotorStateList contains an array of ax12_driver_core::MotorState messages. In C++, ROS arrays are converted to C++ std::vector.

To print the motor position of the first MotorState in the array you might use something like:

ROS_INFO("I heard : %d", msg->motor_states[0].position;);
msg->motor_states[0].position;);

if (msg->motor_states.size() > 0)
0)