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.


and you can see source in here. 

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.



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