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README: Bamboo Spark notes on how to get the connection dance happening 

This device behaves differently depending on whether drawings are available or
not. Spell it out.
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Peter Hutterer 2018-01-15 11:19:23 +10:00
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@ -161,3 +161,74 @@ An expanded file looks like this:
}
```
Device notes
============
When following any device notes below, replace the example bluetooth
addresses with your device's bluetooth address.
Bamboo Spark
------------
The Bluetooth connection on the Bamboo Spark behaves differently depending
on whether there are drawings pending or not. Generally, if no drawings are
pending, it is harder to connect to the device. Save yourself the pain and
make sure you have drawings pending while debugging.
### If the device has no drawings available:
* start `bluetoothctl`, commands below are to be issued in its interactive shell
* enable discovery mode (`scan on`)
* hold the Bamboo Spark button until the blue light is flashing
* You should see the device itself show up, but none of its services
```
[NEW] Device E2:43:03:67:0E:01 Bamboo Spark
```
* While the LED is still flashing, `connect E2:43:03:67:0E:01`
```
Attempting to connect to E2:43:03:67:0E:01
[CHG] Device E2:43:03:67:0E:01 Connected: yes
... lots of services being resolved
[CHG] Device E2:43:03:67:0E:01 ServicesResolved: yes
[CHG] Device E2:43:03:67:0E:01 ServicesResolved: no
[CHG] Device E2:43:03:67:0E:01 Connected: no
```
Note how the device disconnects again at the end. Doesn't matter, now you
have the services cached.
* Don't forget to eventually turn disable discovery mode off (`scan off`)
Now you have the device cached in bluez and you can work with that data.
However, you **cannot connect to the device while it has no drawings
pending**. Running `connect` and pressing the Bamboo Spark button shortly
does nothing.
### If the device has drawings available:
* start `bluetoothctl`, commands below are to be issued in its interactive shell
* enable discovery mode (`scan on`)
* press the Bamboo Spark button shortly
* You should see the device itself show up, but none of its services
```
[NEW] Device E2:43:03:67:0E:01 Bamboo Spark
```
* `connect E2:43:03:67:0E:01`, then press the Bamboo Spark button
```
Attempting to connect to E2:43:03:67:0E:01
[CHG] Device E2:43:03:67:0E:01 Connected: yes
... lots of services being resolved
[CHG] Device E2:43:03:67:0E:01 ServicesResolved: yes
[CHG] Device E2:43:03:67:0E:01 ServicesResolved: no
[CHG] Device E2:43:03:67:0E:01 Connected: no
```
Note how the device disconnects again at the end. Doesn't matter, now you
have the services cached.
* `connect E2:43:03:67:0E:01`, then press the Bamboo Spark button re-connects to the device
The device will disconnect after approximately 10s. You need to start
issuing the commands to talk to the controller before that happens.
* Don't forget to eventually turn disable discovery mode off (`scan off`)
You **must** run `connect` before pressing the button. Just pressing the
button does nothing unless bluez is trying to connect to the device.
**Warning**: A successful communication with the controller deletes the
drawings from the controller, so you may not be able to re-connect.