How to connect multi metawear board?

Hi. All

I just want to know how to connect multi metawear board with a android device. I found some post. But they are too old posts. 

I try to connect two board like below image.

image

and you can see source in here. https://github.com/sewonist/Metawear-Multi-Android 

It looks like working. But first board was disconnecting when last board connected. And really sometime, they are working together. I don't know why they do and don't.

If you have any suggest for me. Please let me know.

Thanks!!!




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