Separate sensor delivery from blocked application execution and repair synchronous-service dependency cycles with explicit callback ownership.
Category: Robotics LiDAR
Nav2 Robot Ignores a Speed Zone: Trace Mask Values to Controller Limits
Trace a Nav2 speed restriction from mask encoding through filter metadata and SpeedLimit messages to controller output.
LiDAR PointCloud2 Looks Corrupt in a Custom Decoder: Check Field Offsets and Row Strides
A practical workflow for diagnosing custom PointCloud2 decoders using preserved bytes, explicit field dictionaries and bounded comparisons.
LiDAR Topics Work Locally but Disappear on Another ROS 2 Computer: Audit Discovery
A working local LiDAR cloud does not establish remote ROS communication. Compare actual process environments and discovery settings before changing hardware.
Ethernet LiDAR Packets Arrive but Clouds Lose Sectors: Check IP Fragment Reassembly
Separate visible network frames from complete UDP delivery. Preserve fragment captures, host evidence and decoder inputs before changing network settings.
LiDAR and Camera Topics Arrive but the ROS 2 Synchronizer Never Calls Back
Separate topic delivery from message matching. Inspect actual filter inputs, header stamps, queue retention and callback execution before changing hardware.
A Saved LiDAR Map Will Not Resume Mapping: Choose Image Maps or Pose-Graph Artifacts
A map image and a serialized mapping session serve different consumers. Inventory complete artifact sets and verify the intended save and restore operation.
LiDAR Frames Jump After a Second Stack Starts: Audit TF Ownership and Robot IDs
Compare each stack alone and both together. Assign transform owners and trace frame identities across estimators, model publishers, bridges and consumers.
A 2D LiDAR Scan Is Mirrored or Rotated: Audit Angle Metadata and Range Order
Trace index-to-bearing interpretation before changing mounting transforms. Compare original scans, driver processing and downstream consumers against asymmetric fixed targets.
ROS Image Topic Exists but Rectification Receives Nothing: Check the Transport Boundary
A visible image topic does not prove rectifier delivery. Audit payload types, transport selection, decoding and camera-info pairing boundary by boundary.
