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Hi Lyza

I have read a brief of content but it seem like you 're not going to write about How to control bluetooth module.
In my opinion I think that if you could write about using Node.js and some library like noble, bleno to read and write data, then use johnyfive to do things with data, this book could become more attractive because the IOT is the future and bluetooth is IOT 's core.
How about creating bluetooth communication between pi and tessel, pi read temperature sensor value and send that data to tessel? It's not a bad idea right?

Best Regards