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Added IO Gripper Control and Configuration Messages, Services, and Actions #164

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Added IO Gripper Control and Configuration Messages, Services, and Actions #164

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65b2736
Added IOGripperController msgs.
destogl Nov 29, 2024
aece6f9
Update actions, add action for Gripper (open/close) and setting a
mamueluth Dec 11, 2024
5ea829d
Merge branch 'ros-controls:master' into gripper-io-msg
sachinkum0009 Dec 21, 2024
4b40c30
fix: standardize end-of-file formatting in control_msgs
sachinkum0009 Dec 21, 2024
ebcff47
Update CMakeLists.txt
destogl Jan 2, 2025
90a82bf
Rename IoGripperSensor.msg to IOGripperSensor.msg
destogl Jan 2, 2025
af79a5c
renamed interface names and added doc
sachinkum0009 Jan 2, 2025
e823a9e
removed whitespace line
sachinkum0009 Jan 3, 2025
db1f368
Merge branch 'master' into gripper-io-msg
destogl Jan 9, 2025
d1d054a
Update code for states
sachinkum0009 Jan 9, 2025
c02e54b
configuration names modified
sachinkum0009 Jan 9, 2025
5aeb6d2
configuration names modified
sachinkum0009 Jan 9, 2025
d460ba8
pre-commit fix
sachinkum0009 Jan 9, 2025
017ed60
doc updated for states
sachinkum0009 Jan 9, 2025
49f4a85
Update messges to have better status from the gripper.
destogl Jan 17, 2025
4427a63
pre-commit fix
sachinkum0009 Jan 20, 2025
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4 changes: 4 additions & 0 deletions control_msgs/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@ set(msg_files
msg/SingleDOFStateStamped.msg
msg/SteeringControllerStatus.msg
msg/SpeedScalingFactor.msg
msg/IOGripperSensor.msg
)

set(action_files
Expand All @@ -48,11 +49,14 @@ set(action_files
action/JointTrajectory.action
action/PointHead.action
action/SingleJointPosition.action
action/Gripper.action
action/SetGripperConfig.action
)

set(srv_files
srv/QueryCalibrationState.srv
srv/QueryTrajectoryState.srv
srv/SetConfig.srv
)

rosidl_generate_interfaces(${PROJECT_NAME}
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6 changes: 6 additions & 0 deletions control_msgs/action/Gripper.action
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This custom Gripper action maybe should be renamed to IOGripperCommand.

@bmagyar the reason to have a separate action here is that this kind of gripper has only open/close states, and nothing can be controlled much. Usually, those are the pneumatic ones so some cylinders are moving somehow, but we can not control intermediate states, i.e., "positions".

Looking at the existing Actions and having, e.g., JointState as input to the action (as done in ParallelGripperAction could be possible, but confusing and inconvenient. Possibly as a secondary interface, but as of now I don't see the usability of it, as we would command something implicitly that we cannot control.

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Thanks for the suggestion. I have updated the interface names.

Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
bool open
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What if you want to control the percentage of the closure?

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That's a good idea. I will update it.

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@destogl destogl Jan 2, 2025 •
edited
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@saikishor in this case you cannot control the percentage of the closure. As there are IOs controlled behind it and usually pneumatic gripper that might have different states, but those are then different IOs, in most cases those have only 2 states, open and close and not a chance to detect anything in between.

What here might be interesting, that we have different states besides open and close as we have 2 closed states and then we can set the target state of the gripper - bit this smells a lot to the configuration, so I am not sure if we should go this way, but rather we should keep only two states that we can command: open and close.

---
bool success
string message
---
uint8 state
6 changes: 6 additions & 0 deletions control_msgs/action/SetGripperConfig.action
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@destogl destogl Jan 2, 2025 •
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@bmagyar
There is no similar Action as of now. The IO Gripper might be quite complex, to have different configurations that are independent of open/close functionality. For example, configuration to grasp narrower and wider objects. In this case, the configuration has to be set before the grasping (and planning) as the collision model of the gripper changes by moving a degree of freedom through configuration.

Independently of configuration, the open/close stays the same, i.e., moving some other joints, but overall kinematics changes depending on the gripper configuration.

Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
string config_name
---
bool result
string status
---
uint8 state
1 change: 1 addition & 0 deletions control_msgs/msg/IOGripperSensor.msg
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
bool state
4 changes: 4 additions & 0 deletions control_msgs/srv/SetConfig.srv
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same comment as for the action.

Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
string config_name
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How do you configure just based on string?. I think It is missing some documentation

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@sachinkum0009 please add in general documentation about all fields in the message. Add those as comments at the begin of the message.

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general documentation about all fields in the message added.

---
bool result
string status
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