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README.md: Add description about -r option for scan failure

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Add an item to "In Case You Fail to Connect" section to describe that
the "-r" option may help to address device scan failure.

Signed-off-by: Shin'ichiro Kawasaki <kawasaki@juno.dti.ne.jp>
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Shin'ichiro Kawasaki
2023-03-21 16:52:16 +09:00
parent 7050016ee6
commit d1f7f58ca2
1 changed files with 14 additions and 2 deletions
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README.md
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@@ -141,10 +141,22 @@ In Case You Fail to Connect
* If the service is not working, refer guide of your distro to set it up.
* If the service is working, also check that /etc/bluetooth/main.conf sets AutoEnable=true.
3. If scratch_link.py says "failed to connect to BT device: [Errno 13] Permission denied",
3. If device scan still fails, use -r option to retry device scan.
The command line below does device scan twice. Each scan takes 10 seconds.
```
$ scratch_link -r 2
```
It would be good to use -s option together to reduce each scan duration.
The command line below does 3 seconds device scan twice.
```
$ scratch_link -r 2 -s 3
```
4. If scratch_link.py says "failed to connect to BT device: [Errno 13] Permission denied",
make sure to pair the bluetooth device to your PC before connecting to Scratch.
4. To connect to multiple devices at the same time, make all the target devices
5. To connect to multiple devices at the same time, make all the target devices
ready for scan at the first device scan. This is important for toio. The toio
allows a single project to connect to two toio devices.
* When the second device was prepared after the first device was connected, device scan can not find the second device.