Support for Powered Up Remote Handset (Lego 88010) about pylgbst HOT 6 OPEN

Thanks, @cpseager , that did it! I got both button sets working. I will clean up my branch and make a pull request.

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Remote buttons are a unique sensor type (id 55) so you need to add a new peripheral class (not Button) to handle this type of sensor.

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@cpseager thanks for the hint! I noticed that Button differs from other sensors by lacking its own implementation of _decode_port_data. So I created a subclass of Peripheral named RemoteButton, where I implement the subscribe and unsubscribe methods, and I added a bare _decode_port_data that, for initial debugging, just prints its parameter. No difference with what I had before. The subscription mechanism works, but the only button that sends callback notifications is the green hub button, which is not even mapped in the class. I can trace the internals of the bluetooth messaging in the computer, and see that nothing seems to come out of the remote buttons when they are pressed. I checked it with two remotes, so it's not a defect in the hardware. I am at loss on what is going on.

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On the remote the two buttons are configured as ‘external’ sensors (id 55) on ‘internal’ ports 0 and 1. This makes sense, as in this case you cannot configure them as two dedicated ‘internal’ ports (like Voltage or Button ports) as they would both need to use the same port id number.

Therefore a quick scan of your dev branch shows you have appeared to try to configure the RemoteButton as an internal port (like Button) rather than external (like VisionSensor). In particular your subscribe will need to be something along the lines of

def subscribe(self,callback, mode=0, granularity=1):
super().subscribe(callback, mode, granularity)

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I created PR #132 to implement the remote (cc @undera )

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I have added some comments on the code, please address those.

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