Reset Demo Data for Fresh Replay¶

Quick guide to clear all ros_bridge data before re-running the demo.

Quick Reset (Copy-Paste)¶

Run this single command to clear everything:

# Clear TROE temporal data + restart Orion to reset entity
docker exec fiware-timescaledb psql -U orion -d orion -c \
  "DELETE FROM attributes WHERE entityid = 'urn:ngsi-ld:Process:ros_bridge';" && \
docker exec db-mongo mongo orion --quiet --eval \
  "db.entities.deleteOne({'_id.id': 'urn:ngsi-ld:Process:ros_bridge'})" && \
docker compose restart orion-ld && \
sleep 5 && \
echo "✅ Data cleared. Ready for fresh demo."

What Gets Cleared¶

Storage	Data	Command
TimescaleDB (TROE)	Historical measurements	`DELETE FROM attributes WHERE entityid = '...'`
MongoDB	Current entity state	`db.entities.deleteOne(...)`
Orion Cache	In-memory state	`docker compose restart orion-ld`

Step-by-Step (If You Want to Understand)¶

1. Clear Temporal Data (TROE/TimescaleDB)¶

docker exec fiware-timescaledb psql -U orion -d orion -c \
  "DELETE FROM attributes WHERE entityid = 'urn:ngsi-ld:Process:ros_bridge';"

This removes all historical measurements from the time-series database.

2. Delete Entity from MongoDB¶

docker exec db-mongo mongo orion --quiet --eval \
  "db.entities.deleteOne({'_id.id': 'urn:ngsi-ld:Process:ros_bridge'})"

This removes the current entity state.

3. Restart Orion (Clear Cache)¶

docker compose restart orion-ld
sleep 5  # Wait for Orion to be ready

4. Verify Clean State¶

# Should return 404 (entity doesn't exist)
curl -s "http://localhost:1026/ngsi-ld/v1/entities/urn:ngsi-ld:Process:ros_bridge" | jq '.title'

# Should return empty measurements
curl -s "http://localhost:8001/process/ros_bridge/measurements?last=5" | jq '.count'

Expected output:

"Entity Not Found"
0

Now Run the Demo¶

# DDS telemetry demo mode
./demo/simulation-demo-rosbag.sh

The demo script will automatically create a fresh entity.

Note: the current baseline uses a DDS-first path with ProcessTelemetry aggregation.

Troubleshooting¶

“Entity already exists” but data looks old¶

The entity exists in MongoDB but might have stale attributes. Run the full reset above.

Data still showing after reset¶

Mintaka might be caching. Wait 10-15 seconds or restart Mintaka:

docker compose restart mintaka

Permission denied on docker commands¶

Run in a terminal with docker group access:

newgrp docker
# Then run the reset commands

Create an Alias (Optional)¶

Add to your ~/.bashrc:

alias reset-robin-demo='docker exec fiware-timescaledb psql -U orion -d orion -c "DELETE FROM attributes WHERE entityid = '\''urn:ngsi-ld:Process:ros_bridge'\'';" && docker exec db-mongo mongo orion --quiet --eval "db.entities.deleteOne({'\''_id.id'\'': '\''urn:ngsi-ld:Process:ros_bridge'\''})" && cd /path/to/open-robin && docker compose restart orion-ld && sleep 5 && echo "✅ Reset complete"'

Then just run:

reset-robin-demo