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Added stsl interface package finding error resolution #241

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8 changes: 8 additions & 0 deletions projects/week_4/Instructions.md
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Expand Up @@ -121,6 +121,14 @@ ros2 interface show <service_type>

You should see two sets of fields, separated by `---`. The fields above this line are the request message. The fields below the line are the response message. So, hopefully now it's clear that our client will be sending a location (x and y), and will be getting back the elevation and a success flag. If any of your service requests reply with the success flag set to `false`, you should see an error message logged from the `elevation_server` node.

<details markdown="1">
<summary>If encountered `Unknown package 'stsl_interfaces'` </summary>
Go back to the stsl dir and run the setup script

`cd../stsl`
`source install/setup.bash`
</details>

Try sending an elevation sample request from the command line. You can do this with the `service call` command:

```bash
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