25 lines
1018 B
Markdown
25 lines
1018 B
Markdown
# Troubleshooting
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## No sensor data is received on topic
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Data is sent over UDP, and if the sensor data exceeds the maximum receive buffer size of the network stack, the data frame will be silently discarded.
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The solution is to increase the receive memory buffer size
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```bash
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sudo sysctl -w net.core.rmem_max=2097152
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sudo sysctl -w net.core.rmem_default=2097152
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```
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## Discarding message because the queue is full
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If you are getting a message like:
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```
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[rviz]: Message Filter dropping message: frame 'laser' at time 1776876114.823 for reason 'discarding message because the queue is full'
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```
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This could be because there is no `/tf` topic available. This topic is used to describe the relationship between coordinate systems (robot position, lidar position, camera position etc).
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If this is the case, you can changet the fixed frame reference to the lidar itself. Change the `Global Options -> Fixed Frame` option from `map` to `laser` to tell the system to use the laser as the base of all transforms.
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