Thanks a lot!
Updates:
Problem1: set detailed camera control.
Solved by signals like Mark Silliman posted, but still can't focus.
New1: How to focus camera by means of ROS or Python?
New2: What's the difference between set_siganl_value and set_port_value?
Problem2: switch on/off light source.
I can turn it on now by set signal 'set_strobe' of right_hand_camera true, but the light continuously blinking.
New3: How can I just turn it on? Since the light is embeded by the camera, is it possible?
Problem3: read force/torque sensor data.
I found a topic named /robot/limb/right/torque_data, but the type of this topic is motor_sensor_msgs/... . The massage is not defined in the sdk package, so I can't read this topic.
New4: Is that topic the one I want? Is the package that includes the motor_sensor_msgs open source and how can I find it?
Futhermore New5: Is there any complete list of functions and devices I can use? Because I had no idea about the signals before, so I could never find these detailed camera control settings, which makes me think of many other usage I missed. Is there any detailed explanation?
Sorry for last reply which I have not completed before posting.
I will appreciate it a lot if any of potential solutions and ideas are replied!